Release v0.4.0 [skip release] [skip actions]

The extras control accepts a file — the field and its label said so — and the
listing under it could not show one, because the Host primitive behind the picker
browses folders and nothing else. So a grant for a single file meant typing its
name exactly, which is the one thing a listing exists to avoid.

The Host has a second lister and it does return files: `remote.workspaceFiles.list`,
the same listing behind the sidebar's own file tree, confined to the session's
workspace. The extras picker now takes that one while the level is inside the
session folder — which is where an extra usually is — and falls back to the folder
lister above it, saying so in the dialog rather than letting file rows vanish. The
focus picker never offers files: a focus is a folder, so a file row there would
offer something that cannot be chosen.

The two listings normalise into one level shape, so the picker does not care which
answered, and a row now carries its type: a folder is a way down, a file is a
thing to take. Clicking a file fills the path field and marks the row, and the
footer adds it in declared form. Pressing Enter on a name the level already lists
is no longer reported as a failure — the path is exactly what the dialog is for.
Everything stays additive: with no workspace file service, or above the session
folder, the picker lists folders exactly as before.

AGENTS.md

@@ -21,6 +21,24 @@ release notes. Write it for that reader:
 `feat` has to be a word, so `Fix the feature flag leak` is a patch. Only the
 subject line is read; the body is not.
 
+## Commit as the work lands
+
+Commit each step as soon as it is finished rather than leaving it in the tree
+until the end. Two reasons, and the second is the one that bites:
+
+- An uncommitted change has no release note at all. The subject is the sentence a
+  user reads, so work that never becomes a commit never becomes a sentence.
+- A tree carrying four unrelated changes cannot be split into four honest
+  subjects after the fact — the reasoning behind each one is only in the
+  transcript by then, and the range picks its bump from whatever subjects it
+  ends up with. One `feat:` batched in with a handful of fixes is a minor bump
+  for all of them.
+
+Keep a subject to one change and the version follows from it.
+
+A commit here is local. Pushing to `master` is what releases, so it stays a
+separate, deliberate step.
+
 ## The release job owns the version and the changelog
 
 `package.json`'s `version` and `CHANGELOG.md` are the job's to write, derived

CHANGELOG.md

@@ -2,6 +2,33 @@
 
 Every release, newest first, generated from the commits in each release.
 
+## v0.4.0 — 2026-09-28
+
+### Added
+
+- list files in the extras picker, not just folders
+
+
+## v0.3.1 — 2026-09-27
+
+### Fixed
+
+- a delegated session inherits the facet it was spawned under
+- judge a search that names no path against the directory it would use
+- name the allowed-paths action for what it adds, a path or a file
+
+
+## v0.3.0 — 2026-09-27
+
+### Added
+
+- pick the focus and the allowed paths from a directory listing
+
+### Documented
+
+- commit each step as the work lands, not in one lump at the end
+
+
 ## v0.2.0 — 2026-09-27
 
 ### Added

README.md

@@ -48,6 +48,15 @@ wrong, and an agent that cannot reach a shared type does not stop needing it.
 So an out-of-scope file call is put to you, and saying yes records the grant for
 the rest of the conversation.
 
+**A tool that names no path is judged on the path it would use.** `grep`, `glob`
+and `recall` all default to a directory when the model omits one — the session
+directory for the first two, a marker-chosen one for the third — and on a session
+whose facet is narrower than its directory, that default reads outside the facet.
+An absent argument is not an absent path, so those three are judged against the
+default they would have searched, and the refusal says which argument to add.
+`lib/scope.js` holds the list; a tool with no path argument at all is still left
+alone, because it has no default that could leave.
+
 ### The `facet` tool
 
 | action | effect |
@@ -145,6 +154,15 @@ and your root otherwise. So an agent that goes wrong cannot widen its own scope,
 and `facet action=reset` returns it to what you declared rather than to the
 session directory — landing on the directory would have made `reset` a widening.
 
+**A session spawned or forked from a scoped one inherits its root.** Your
+declaration is keyed by session id, and a subagent or a fork has none of its own,
+so without this its facet would be its own working directory — one level up, and
+a way to delegate around the scope rather than work inside it. The inherited root
+already includes the parent's own narrowing, so delegating is not a way back out
+of a focus the agent set for itself either, and it is recorded per level, so it
+holds at any depth of delegation. It applies only where you made no statement:
+a declaration for the child session is the more specific answer and stands.
+
 You set the declaration from the **crosshair button on the composer tool row**,
 which appears only in sessions running the `facet` preset. It shows the focus and
 the allowed paths, adds and removes them, and carries the mode details and usage
@@ -152,6 +170,36 @@ notes that the preset picker's guide dialog cannot show for a preset no core
 package ships. Writes go to the profile patch, so reopening a chat gives back the
 scope it had.
 
+Both controls are a **directory listing**, not a text box: the panel's vocabulary
+is paths relative to the session folder, and "which folder is `../shared`" is the
+one question free text cannot answer. Pressing it opens a second dialog over the
+panel, shaped like the host's own workspace browser — one level of children, a
+breadcrumb trail, a hidden-entries toggle, and a file-type glyph per row. A pick
+is stored in the form that keeps its meaning: `/work/root/src/shared` becomes
+`src/shared` when the session started in `/work/root`.
+
+The listing is driven by **two Host listers**, because they answer different
+questions and the extras need both:
+
+| lister | returns | reach |
+|---|---|---|
+| `uiWorkspace.listDirectory` | folders | anywhere on the machine |
+| `remote.workspaceFiles.list` | files and folders | the session's workspace only |
+
+The extras picker takes the file listing while the level is inside the session
+folder, which is how a file is chosen by clicking its name instead of typing it —
+the same listing behind the sidebar's own file tree, applied one level at a time.
+Above the session folder the Host confines it, and the level falls back to folders
+and says so in the dialog: a file outside the workspace is still added by typing
+its path, which is why the action reads **Add path or file** and its field **Path
+or file**. The focus picker never offers files at all — a focus is a folder, so a
+file row there would offer something that cannot be chosen.
+
+A folder row is a way down; a file row is a thing to take. Clicking a file fills
+the path field and marks the row, and the footer's action then adds it in declared
+form; pressing Enter on a name the level already lists is not an error, because
+the path is exactly what this dialog is for.
+
 Because the panel owns widening, `facet action=add` is the *other* path and the
 narrower one: it is gated on an approval channel, and a deployment with none — the
 `danger-full-access` permission preset sets `approval: never` — refuses it before
@@ -196,7 +244,10 @@ Honest boundaries, because each one is a decision rather than an oversight:
 - **`bash` is not guarded.** A shell command cannot be judged reliably from
   argv, so the facet is enforced on the file tools and `bash` remains a
   legitimate way out. The prompt tells the model this rather than pretending
-  otherwise.
+  otherwise. It is not a theoretical hole: the first deployment to run this had
+  an agent scoped to one module use a shell command to parse a config file
+  outside its facet, having been told in the same prompt not to. A prompt is not
+  a guard, which is what the rest of this plugin is for.
 - **Tools that name a path in a shape the table cannot read are not guessed at** —
   including MCP tools. See `PATH_ARGUMENTS` in `lib/scope.js`; it is a list of
   tools whose path argument is a plain top-level string.
@@ -213,26 +264,32 @@ Honest boundaries, because each one is a decision rather than an oversight:
 
 Verified:
 
-- 73 tests (`npm test`) over the scope algebra, the policy state, the guard, and
+- 93 tests (`npm test`) over the scope algebra, the policy state, the guard, and
   the browser half — including that containment is decided on canonical targets
   (a symlink inside the facet pointing outside it is refused), that a prefix is
   not a parent (`/a/room` does not contain `/a/roommate`), that a malformed tool
   call never makes the guard throw, that a live `mode` edit decides the next call
   without the guard being remounted, that an agent narrowing the user has since
   narrowed past is dropped rather than honoured, that `reset` lands on the
-  declared scope rather than the session directory, and that every `facet` result
+  declared scope rather than the session directory, that a search naming no path
-  satisfies the tool's own declared output schema.
+  is refused when the directory it defaults to is outside the facet, that a
+  delegated session inherits its parent's root at any depth and is not a way back
+  out of a self-narrowing, that both listings normalise into one picker level and
+  that a file listing the Host confines still leaves a browsable one, and that
+  every `facet` result satisfies the tool's own declared output schema.
 - The bundle's patch layers parse, merge and land correctly against the real
   profile: `dsh --profile web --patch ./cordis.patch.yml --patch
   ./presets/facet.patch.yml --dump-config` shows `facet-policy`, `preset-facet`,
   the `facet-guard` row and the compaction config, with `preset-standard`
   untouched. The optional `standard-compaction` overlay was checked the same way.
 
-**Not yet verified: a live session.** The plugin has not been loaded by a running
+**Verified live.** The bundle is installed in a `web` profile and composing
-harness, because that needs the bundle installed. The first thing to check after
+sessions: the runtime binding is in the running session's context, the crosshair
-installing is that `preset-facet` is not `broken` — a preset whose child row
+panel writes the declaration, and the guard decides the calls it names. That is
-fails to resolve still appears on the roster, with its diagnostic, and cannot
+also where the `bash` boundary above was confirmed the hard way. The first thing
-compose a session:
+to check after any change is still that `preset-facet` is not `broken` — a preset
+whose child row fails to resolve still appears on the roster, with its
+diagnostic, and cannot compose a session:
 
 ```sh
 dsh --profile web --dump-config | grep -A 3 preset-facet
@@ -297,7 +354,7 @@ lib/scope.js                 the pure half — argument extraction, text, reason
 lib/guard.js                 preset row: rule, binding, tool, pre-execute guard
 presets/facet.patch.yml      the `facet` agent preset
 presets/standard-compaction.patch.yml   optional: the same budget for `standard`
-test/                        73 tests
+test/                        93 tests
 ```
 
 `client/client.js` is a browser half rather than a module the host imports, and
@@ -322,6 +379,28 @@ refuses a path that is not under a volatile node, and refusing is exactly right
 the panel is the only writer, and a plugin that could not serve the namespace
 would be a control that silently stored nothing.
 
+The listings reach the panel through `ctx.get` rather than through an injection —
+`uiWorkspace` for folders and `remote.workspaceFiles` for files — and each
+`available()` is asked on every render. Both are deliberate: `ctx.inject` would
+make the whole context button conditional on services the plugin does not own, and
+the panel is still the only way to declare scope in a deployment with no directory
+browser — it would simply have no listing to offer, which is what it says instead.
+The services are resolved at the call because the renderer memoizes a
+registration's inject result, so a boolean read there would freeze at whatever the
+first render saw. Both packages are named in this bundle's `dsh.client.inject`, so
+a profile that installs this one gets the services its dialog asks for.
+
+The two dialogs are wider than the primitive's 380px card, which is fixed in the
+primitives' own stylesheet. `client/client.js` installs one small stylesheet of
+its own — the widths and a row hover — and passes each card a class through
+`Modal`'s `className`. Every selector in it doubles the class it names, so it
+outranks the single hashed class the primitive applies whatever order the two
+stylesheets land in; there is no `!important` and nothing reaching into a class
+name this bundle does not own. The panel's body is a two-column grid that
+`auto-fit` collapses to one on a narrow card, and each dialog scrolls a bounded
+body rather than growing past the viewport — the panel used to be a tall single
+column of prose on a 380px card, which is what it looked like.
+
 ## Also in this repository
 
 - [`facet-preset.md`](../facet-preset.md) — the design note this was built from,

lib/guard.js

@@ -37,6 +37,8 @@ import {
   FACET_TOOL,
   facetContextText,
   facetRuleText,
+  IMPLICIT_SESSION_PATHS,
+  implicitSearchReason,
   isWideningCall,
   outsideReason,
   pathArgumentsFor,
@@ -181,7 +183,20 @@ export function apply(ctx, config) {
     if (scope === undefined) return undefined
 
     const paths = pathArgumentsFor(exec.name, exec.arguments)
-    if (paths.length === 0) return undefined
+    if (paths.length === 0) {
+      // A tool that names no path is judged against the path it will actually
+      // use. For most of them that is nothing — a tool with no path argument
+      // cannot leave the facet. For the ones whose own default is a directory it
+      // is the session directory, which a narrowed facet does not contain, and
+      // "no opinion" there would hand the model a read the guard exists to
+      // refuse. The containment test is the same one; only the path is ours
+      // rather than the model's.
+      if (!IMPLICIT_SESSION_PATHS.includes(exec.name)) return undefined
+      const verdict = await inside(scope, scope.cwd, exec.signal)
+      if (verdict.inside) return undefined
+      const kind = mode === 'deny' ? 'deny' : 'ask'
+      return { kind, reason: implicitSearchReason({ cwd: scope.cwd, root: scope.root }) }
+    }
 
     for (const raw of paths) {
       const verdict = await inside(scope, raw, exec.signal)

lib/policy.js

@@ -97,6 +97,29 @@ export function createFacetPolicy(config) {
   const grants = new Map()
   /** @type {Map<string, string>} session id → the agent's narrowing focus, absolute. */
   const narrowed = new Map()
+  /**
+   * The root resolved for each session, recorded as it is computed.
+   *
+   * A session spawned or forked from this one has no declaration of its own, so
+   * without this its facet would be its own working directory — wider than the
+   * conversation it came from, which is the one direction this whole plugin
+   * promises cannot happen. The recorded root already includes the parent's own
+   * narrowing, so a child is never wider than the parent is *now*, and the
+   * record's existence is what makes the inheritance work per level rather than
+   * for one hop.
+   *
+   * @type {Map<string, string>} session id → the root in force for it.
+   */
+  const roots = new Map()
+  /**
+   * Child session id → the session it inherited from, for as long as both live.
+   *
+   * Kept so {@link forget} can tell a root nobody needs any more from one a
+   * delegated child is still answering to.
+   *
+   * @type {Map<string, string>}
+   */
+  const spawnedFrom = new Map()
 
   /**
    * What the user declared for one session, read fresh.
@@ -112,6 +135,23 @@ export function createFacetPolicy(config) {
     return entry !== null && typeof entry === 'object' ? entry : undefined
   }
 
+  /**
+   * The session this one was spawned or forked from, when the header says so.
+   *
+   * The harness's own durable lineage field, so the link survives a restart and
+   * a child whose parent is no longer running is still contained. `fork` records
+   * the session it was seeded from and a subagent its direct parent; both are
+   * one conversation's work continuing, which is what makes inheriting the right
+   * answer for either.
+   *
+   * @param {{session?: {header?: {parentSession?: unknown}}}|undefined} agent - the calling agent.
+   * @returns {string|undefined} the parent's session id.
+   */
+  function parentOf(agent) {
+    const parent = agent?.session?.header?.parentSession
+    return typeof parent === 'string' && parent !== '' ? parent : undefined
+  }
+
   /**
    * The root in force for one session.
    *
@@ -123,16 +163,22 @@ export function createFacetPolicy(config) {
    * place — this one only has to notice a root that has since moved out from
    * under it.
    *
+   * Inheritance is the same kind of test, and it is skipped when the user made a
+   * declaration of their own: that is their decision about *this* session, and
+   * the point of inheriting is to answer the case where they made none.
+   *
    * @param {string|undefined} sessionId - the session.
    * @param {string} sessionCwd - its resolved working directory.
+   * @param {string} [inherited] - the root of the session it came from, if known.
    * @returns {string} the absolute facet root.
    */
-  function rootFor(sessionId, sessionCwd) {
+  function rootFor(sessionId, sessionCwd, inherited) {
     const declared = declaredScope(sessionId)?.focus
-    const base = typeof declared === 'string' && declared.trim() !== '' ? resolve(sessionCwd, declared) : sessionCwd
+    const stated = typeof declared === 'string' && declared.trim() !== ''
+    const own = stated ? resolve(sessionCwd, declared) : sessionCwd
+    const base = !stated && inherited !== undefined && within(inherited, own) ? inherited : own
     const agentFocus = sessionId === undefined ? undefined : narrowed.get(sessionId)
-    if (agentFocus === undefined) return base
+    if (agentFocus !== undefined && within(agentFocus, base)) return agentFocus
-    if (agentFocus === base || agentFocus.startsWith(base.endsWith(sep) ? base : `${base}${sep}`)) return agentFocus
     return base
   }
 
@@ -162,7 +208,13 @@ export function createFacetPolicy(config) {
    * resolve against. A declaration written relative to the session keeps the
    * same meaning whatever the session is focused on.
    *
-   * @param {{session?: {header?: {cwd?: unknown}, id?: unknown}}|undefined} agent - the calling agent.
+   * Resolving a scope is also where a session's own root is *recorded*, which is
+   * what a session spawned from it later inherits. Every session resolves a
+   * scope before it can call anything — the binding is assembled for each model
+   * request, and the guard classifies each tool call — so a parent's root is
+   * always on the record by the time it can spawn or fork.
+   *
+   * @param {{session?: {header?: {cwd?: unknown, parentSession?: unknown}, id?: unknown}}|undefined} agent - the calling agent.
    * @returns {FacetScope|undefined} the scope.
    */
   function scopeFor(agent) {
@@ -170,9 +222,13 @@ export function createFacetPolicy(config) {
     if (typeof cwd !== 'string' || cwd.trim() === '') return undefined
     const sessionCwd = resolve(cwd)
     const sessionId = idOf(agent)
+    const parent = parentOf(agent)
+    if (sessionId !== undefined && parent !== undefined) spawnedFrom.set(sessionId, parent)
+    const root = rootFor(sessionId, sessionCwd, parent === undefined ? undefined : roots.get(parent))
+    if (sessionId !== undefined) roots.set(sessionId, root)
     return {
       cwd: sessionCwd,
-      root: rootFor(sessionId, sessionCwd),
+      root,
       extras: extrasFor(agent, sessionCwd),
     }
   }
@@ -284,10 +340,22 @@ export function createFacetPolicy(config) {
     return [...(grants.get(sessionId) ?? [])]
   }
 
-  /** Drop a finished session's grants. Called on `session/disposed`. */
+  /**
+   * Drop a finished session's state. Called on `session/disposed`.
+   *
+   * The root is the one entry that is not simply dropped: a session spawned from
+   * this one may still be running, and it answers to the facet it was spawned
+   * under. So the record is kept while any live session still records this one
+   * as its parent, and released the moment none does. Without that, disposing a
+   * parent would quietly widen its children back to their own directory.
+   *
+   * @param {string} sessionId - the session being disposed.
+   */
   function forget(sessionId) {
     grants.delete(sessionId)
     narrowed.delete(sessionId)
+    spawnedFrom.delete(sessionId)
+    if (![...spawnedFrom.values()].includes(sessionId)) roots.delete(sessionId)
   }
 
   return {
@@ -325,6 +393,25 @@ function isPath(value) {
   return typeof value === 'string' && value.trim() !== ''
 }
 
+/**
+ * Whether one absolute path is the other, or sits inside it.
+ *
+ * A string test, deliberately, and the only one in this module. The guard's
+ * containment check — the one that decides whether a *call* may proceed — runs
+ * on canonical filesystem targets, because a symlink inside the facet must not
+ * open it. This one only compares two roots the plugin itself derived from the
+ * session directory, where there is nothing to resolve and a symlink would have
+ * had to be introduced by the declaration.
+ *
+ * @param {string} inner - the path that may be inside.
+ * @param {string} outer - the path that may contain it.
+ * @returns {boolean} whether it is inside.
+ */
+function within(inner, outer) {
+  if (inner === outer) return true
+  return inner.startsWith(outer.endsWith(sep) ? outer : `${outer}${sep}`)
+}
+
 /**
  * The session id of a calling agent, when it has one.
  *

lib/scope.js

@@ -54,6 +54,28 @@ export const PATH_ARGUMENTS = Object.freeze({
   recall: ['path', 'focus'],
 })
 
+/**
+ * Tools that will search the session directory when the model names no path.
+ *
+ * The guard's rule is that a call naming no path is not judged, because a tool
+ * that names no path cannot leave the facet. That holds for a tool with no path
+ * argument at all, and fails for these three: their *own* default is the session
+ * workspace. `grep` and `glob` document both their path arguments as "Defaults to
+ * the session workspace", and `recall` falls back to a directory its own marker
+ * search picks — an ancestor of the facet whenever the facet carries no
+ * `CONTROLLER.md` of its own.
+ *
+ * So on any session whose facet is narrower than its directory — every session
+ * whose focus was set from the panel rather than by starting the conversation in
+ * the folder — a bare `grep` reads outside the facet. An absent argument is not
+ * an absent path; it is the default one, and that is the path the guard judges.
+ *
+ * `recall` is another package's tool and is named here because the coupling to
+ * its two path arguments already exists in {@link PATH_ARGUMENTS}: leaving it
+ * out would keep a read path the table claims to cover.
+ */
+export const IMPLICIT_SESSION_PATHS = Object.freeze(['grep', 'glob', 'recall'])
+
 /** The tool this plugin registers, and the action on it that widens the scope. */
 export const FACET_TOOL = 'facet'
 export const WIDENING_ACTION = 'add'
@@ -66,7 +88,10 @@ export const WIDENING_ACTION = 'add'
  * Anything that is not a non-empty string is skipped.
  *
  * An empty result means "no opinion" — either the tool names no path (so it
- * cannot leave the facet) or it names one in a shape we refuse to guess at.
+ * cannot leave the facet) or it names one in a shape we refuse to guess at. The
+ * first half of that is not true of every tool: the ones whose own default is a
+ * directory are listed in {@link IMPLICIT_SESSION_PATHS}, and the guard judges
+ * them against the directory they will actually search.
  *
  * @param {string} toolName - the tool being called.
  * @param {unknown} args - the raw model arguments.
@@ -236,6 +261,29 @@ export function outsideReason(input) {
   return `${what} is ${verb} — this session's facet is ${root}. Ask the user to grant it (\`facet action=add\`), or work within the facet.`
 }
 
+/**
+ * Why a search that named no directory is being questioned.
+ *
+ * A separate sentence from {@link outsideReason} because the fault is different.
+ * There, the model named a path outside the facet and is told which one. Here it
+ * named nothing, so the path at issue is one it never wrote: the tool's own
+ * default. Saying so is the whole remedy — the fix is a second argument, not a
+ * grant — so the reason names the directory the search would have covered and
+ * the one it had to stay in.
+ *
+ * @param {object} input
+ * @param {string} input.cwd - the session working directory the tool defaults to.
+ * @param {string} input.root - the facet root.
+ * @returns {string} the reason.
+ */
+export function implicitSearchReason(input) {
+  const { cwd, root } = input
+  return (
+    `This search names no \`path\`, so it would cover this session's directory ${cwd} — and this session's ` +
+    `facet is ${root}. Name a folder inside the facet, or ask the user to grant the one you need.`
+  )
+}
+
 /**
  * Why widening the scope is being put to the user.
  *

package.json

@@ -1,6 +1,6 @@
 {
   "name": "dsh-facet",
-  "version": "0.2.0",
+  "version": "0.4.0",
   "private": true,
   "type": "module",
   "description": "Scope an agent session to one facet of a multi-faceted system: the session's own folder, plus whatever files the user grants it.",
@@ -50,7 +50,9 @@
       "inject": [
         "@deepseek-ai/dsh-client-ui-settings",
         "@deepseek-ai/dsh-client-ui-plugin-manager",
-        "@deepseek-ai/dsh-client-ui-conversation"
+        "@deepseek-ai/dsh-client-ui-conversation",
+        "@deepseek-ai/dsh-client-ui-workspace",
+        "@deepseek-ai/dsh-api-workspace-files"
       ]
     }
   },

test/client.test.js

@@ -35,6 +35,10 @@ async function loadClient() {
     SettingsForm: 'SettingsForm',
     SettingsValueField: 'SettingsValueField',
     SegmentedControl: 'SegmentedControl',
+    // The listing's row glyphs; a client half may only use what the primitives
+    // actually export, so the stand-ins are named the same way.
+    IconFolderCloseRegular: 'IconFolderCloseRegular',
+    FileTypeIcon: 'FileTypeIcon',
     /** Stands in for the real model: records the specs and answers with the value. */
     SettingsFormModel: class {
       constructor(scope, specs) {
@@ -84,14 +88,21 @@ async function loadClient() {
 }
 
 /** Drive `apply` against a fake slot/configForms surface and report what it did. */
-function drive(mod, { served = true, value = {} } = {}) {
+function drive(mod, { served = true, value = {}, workspace } = {}) {
   const seen = { formNs: undefined, watched: undefined, registrations: [] }
   const disposers = []
   let currentSlot
 
+  // The optional service the context panel browses through. `get` is the
+  // Cordis read that answers `undefined` rather than throwing, which is what
+  // the plugin relies on to keep the panel in a deployment with no browser.
+  const get = (name) => (name === 'uiWorkspace' ? workspace : undefined)
+
   const ctx = {
+    get,
     inject: (names, scope) => {
       const scoped = {
+        get,
         configForms: {
           get: (ns) => {
             seen.formNs = ns
@@ -170,8 +181,10 @@ test('the context button rides the composer tool row, gated on the same namespac
   assert.equal(button.options.id, 'facet-context')
   assert.equal(typeof button.options.inject, 'function')
   // It has to receive the settings form, because the panel writes through the
-  // very same document the plugin card does.
+  // very same document the plugin card does — and the browse face, because the
+  // panel's two controls are directory listings.
   assert.equal(typeof button.options.inject().form, 'object')
+  assert.equal(typeof button.options.inject().browse.list, 'function')
 })
 
 test('the host row the form binds to is the one cordis.patch.yml actually declares', async () => {
@@ -291,6 +304,10 @@ test('the client half loads the packages whose slots it registers into', async (
   assert.ok(inject.includes('@deepseek-ai/dsh-client-ui-plugin-manager'), 'registers into plugins.bundle.config')
   assert.ok(inject.includes('@deepseek-ai/dsh-client-ui-conversation'), 'registers into conversation.input.left')
   assert.ok(inject.includes('@deepseek-ai/dsh-client-ui-settings'), 'reads configForms')
+  // Not a slot this half registers into: the panel's directory listing drives
+  // `uiWorkspace.listDirectory`, so the package that provides it has to be in
+  // the boot graph before this half asks for it.
+  assert.ok(inject.includes('@deepseek-ai/dsh-client-ui-workspace'), 'browses through uiWorkspace')
 })
 
 // ── the context button and panel ─────────────────────────────────────────────
@@ -364,31 +381,32 @@ test('the panel renders the scope, the guidance, and a way to add and remove', a
     mutate: (ops) => (written.push(ops), true),
   }
 
-  const tree = mod.FacetContextPanel({ form, sessionId: 'session-1', mode: 'deny', onClose: () => {} })
+  const tree = mod.FacetContextPanel({
+    form,
+    sessionId: 'session-1',
+    cwd: '/work/root',
+    browse: { available: () => true, list: () => Promise.resolve() },
+    onClose: () => {},
+  })
   assert.equal(tree.type, 'Modal')
+  // The class is the whole width fix: the primitive's own card is 380px and it
+  // takes only a class name, so the stylesheet this bundle installs outranks it.
+  assert.equal(tree.props.className, mod.PANEL_CLASS)
 
   // Walk the tree for the text and controls a user would see.
-  const texts = []
+  const texts = textsOf(tree)
-  const buttons = []
+  const buttons = buttonsOf(tree)
   const inputs = []
-  const walk = (node) => {
+  walkTree(tree, (node) => {
-    if (typeof node === 'string') return texts.push(node)
-    if (node === null || node === undefined || typeof node !== 'object') return
-    if (Array.isArray(node)) return node.forEach(walk)
-    if (node.type === 'button') buttons.push(node)
     if (node.type === 'input') inputs.push(node)
-    // Children arrive either as createElement arguments or, as the card does it,
+  })
-    // through the `children` prop.
-    if (Array.isArray(node.children)) node.children.forEach(walk)
-    walk(node.props?.children)
-  }
-  walk(tree)
 
   const labelOf = (node) => (node.children ?? [])[0]
 
   const prose = texts.join('\n')
   assert.match(prose, /What this conversation may see/)
-  // The two tabs the preset picker cannot show for a custom preset live here.
+  // The two tabs the preset picker cannot show for a custom preset live here,
+  // folded away so the controls are not buried under them.
   assert.match(prose, /Mode details/)
   assert.match(prose, /How to use/)
   // The honest bit about this deployment, so the panel does not promise a
@@ -397,9 +415,532 @@ test('the panel renders the scope, the guidance, and a way to add and remove', a
   assert.match(prose, /danger-full-access/)
 
   // The declared scope is on screen, and the existing extra has its own control.
-  assert.equal(inputs[0].props.value, 'src/room')
+  assert.ok(texts.includes('src/room'), 'the focus is shown as the declared path')
+  assert.ok(texts.some((text) => text.includes('/work/root')), 'the session folder relative to what is named')
   assert.equal(buttons.filter((button) => labelOf(button) === 'Remove').length, 1)
-  assert.ok(buttons.some((button) => labelOf(button) === 'Add'))
+
+  // Both controls are the listing. `Set` is gone with the box it committed:
+  // picking writes the declaration straight away, as every other control here
+  // already did.
+  assert.ok(buttons.some((button) => labelOf(button) === 'Browse\u2026'))
   assert.ok(buttons.some((button) => labelOf(button) === 'Clear'))
-  assert.ok(buttons.some((button) => labelOf(button) === 'Set'))
+  assert.ok(buttons.some((button) => labelOf(button) === '+ Add path or file\u2026'))
+  assert.ok(!buttons.some((button) => labelOf(button) === 'Set'))
+  assert.deepEqual(inputs, [], 'the panel itself has no free-text box left')
+})
+
+test('a deployment with no directory browser keeps the panel and says so', async () => {
+  const { module: mod } = await loadClient()
+  const form = {
+    getSnapshot: () => ({ status: 'ready', writable: true, revision: 1, value: { mode: 'deny', scopes: {} } }),
+    subscribe: () => () => {},
+    mutate: () => true,
+  }
+
+  const tree = mod.FacetContextPanel({
+    form,
+    sessionId: 's',
+    cwd: '',
+    browse: mod.directoryBrowse({ get: () => undefined }),
+    onClose: () => {},
+  })
+  const texts = textsOf(tree)
+  const label = (button) => (button.children ?? [])[0]
+
+  // The panel is the only way to declare scope, so it renders without a
+  // browser: the listing affordances go dead, the explanation stays.
+  assert.deepEqual(
+    buttonsOf(tree)
+      .filter((button) => label(button) === 'Browse\u2026')
+      .map((button) => button.props.disabled),
+    [true],
+  )
+  assert.deepEqual(
+    buttonsOf(tree)
+      .filter((button) => label(button) === '+ Add path or file\u2026')
+      .map((button) => button.props.disabled),
+    [true],
+  )
+  assert.ok(texts.some((text) => text.includes('no directory browser')))
+  // The mode is read from the document rather than from a slot prop that never
+  // carried it, so the line does not claim "ask" whatever the setting is.
+  assert.ok(texts.some((text) => text.includes('Deployment mode: deny')))
+})
+
+// ── the directory listing ────────────────────────────────────────────────────
+
+/** A listing shaped the way the Host's browse primitive answers. */
+function listingFixture() {
+  return {
+    path: '/work/root/src',
+    home: '/home/dev',
+    crumbs: [
+      { name: '/', path: '/', hidden: false },
+      { name: 'work', path: '/work', hidden: false },
+      { name: 'root', path: '/work/root', hidden: false },
+      { name: 'src', path: '/work/root/src', hidden: false },
+    ],
+    entries: [
+      { name: 'shared', path: '/work/root/src/shared', hidden: false },
+      { name: '.git', path: '/work/root/src/.git', hidden: true },
+    ],
+    truncated: false,
+  }
+}
+
+/** Let the model's own promise chain settle. */
+function settle() {
+  return new Promise((resolve) => setTimeout(resolve, 0))
+}
+
+/** Every button in a rendered tree, in document order. */
+function buttonsOf(tree) {
+  const found = []
+  walkTree(tree, (node) => {
+    if (node.type === 'button') found.push(node)
+  })
+  return found
+}
+
+/** Every string in a rendered tree, in document order. */
+function textsOf(tree) {
+  const found = []
+  walkTree(tree, (node) => {
+    if (typeof node === 'string') found.push(node)
+  })
+  return found
+}
+
+/** Walk a rendered tree the way it was built: children as arguments or as a prop. */
+function walkTree(node, visit) {
+  if (typeof node === 'string') return visit(node)
+  if (node === null || node === undefined || typeof node !== 'object') return
+  if (Array.isArray(node)) {
+    for (const child of node) walkTree(child, visit)
+    return
+  }
+  visit(node)
+  if (Array.isArray(node.children)) node.children.forEach((child) => walkTree(child, visit))
+  // `footer` is a prop rather than a child, and it is rendered: a control there
+  // is as much part of the tree as one in the body.
+  walkTree(node.props?.children, visit)
+  walkTree(node.props?.footer, visit)
+}
+
+test('a path is declared relative to the session folder wherever it can be', async () => {
+  const { module: mod } = await loadClient()
+
+  assert.equal(mod.relativeTo('/work/root', '/work/root'), '', 'the session folder itself has no name of its own')
+  assert.equal(mod.relativeTo('/work/root', '/work/root/src/shared'), 'src/shared')
+  assert.equal(mod.relativeTo('/work/root/dsh-facet', '/work/root'), '..')
+  assert.equal(mod.relativeTo('/work/root/dsh-facet/lib', '/work/root'), '../..')
+  // Nothing shared: another tree, or another drive. Absolute is the only
+  // spelling that still names it.
+  assert.equal(mod.relativeTo('/work/root', '/srv/other'), '/srv/other')
+  assert.equal(mod.relativeTo('C:\\work\\root', 'D:\\work\\root'), 'D:\\work\\root')
+  assert.equal(mod.relativeTo('', '/srv/other'), '/srv/other')
+  // Windows separators split and join like POSIX ones.
+  assert.equal(mod.relativeTo('C:\\work\\root', 'C:\\work\\other'), '../other')
+
+  assert.equal(mod.absoluteFrom('/work/root', 'src/shared'), '/work/root/src/shared')
+  assert.equal(mod.absoluteFrom('/work/root', '/srv/other'), '/srv/other')
+  assert.equal(mod.absoluteFrom('/work/root', ''), '', 'empty stays empty: it means the session folder')
+  assert.equal(mod.absoluteFrom('', 'src/shared'), 'src/shared', 'with no folder to join, a relative path is left alone')
+  assert.equal(mod.isAbsolutePath('C:\\x'), true)
+  assert.equal(mod.isAbsolutePath('\\\\server\\share'), true)
+  assert.equal(mod.isAbsolutePath('src/x'), false)
+})
+
+test('the browse face is read from uiWorkspace at the call, not at registration', async () => {
+  const { module: mod } = await loadClient()
+
+  // Absent service: the probe answers false and the call rejects with something
+  // the picker can show rather than a TypeError from an undefined property.
+  const missing = mod.directoryBrowse({ get: () => undefined })
+  assert.equal(missing.available(), false)
+  await assert.rejects(missing.list('/tmp'), /no directory browser/)
+  // The file lister is a second service and probes separately: a deployment can
+  // have the folder browser without the workspace file service.
+  assert.equal(missing.files.available(), false)
+  await assert.rejects(missing.files.list('session-1', '/tmp'), /cannot list files/)
+
+  const calls = []
+  const present = mod.directoryBrowse({
+    get: (name) =>
+      ({
+        uiWorkspace: {
+          listDirectory: (path, signal) => {
+            calls.push(['folders', path, signal])
+            return Promise.resolve('listing')
+          },
+        },
+        'remote.workspaceFiles': {
+          list: (sessionId, path, signal) => {
+            calls.push(['files', sessionId, path, signal])
+            return Promise.resolve({ ok: true, value: 'workspace listing' })
+          },
+        },
+      })[name],
+  })
+  assert.equal(present.available(), true)
+  assert.equal(await present.list('/tmp', 'signal'), 'listing')
+  assert.deepEqual(calls, [['folders', '/tmp', 'signal']])
+
+  // The remote answers with a result envelope rather than rejecting, so its
+  // failure branch is turned into one here — the model's catch expects a throw.
+  assert.equal(present.files.available(), true)
+  assert.equal(await present.files.list('session-1', '/work/root', 'signal'), 'workspace listing')
+  assert.deepEqual(calls[1], ['files', 'session-1', '/work/root', 'signal'])
+
+  const refusing = mod.directoryBrowse({
+    get: (name) =>
+      name === 'remote.workspaceFiles'
+        ? { list: () => Promise.resolve({ ok: false, error: new Error('workspace files are unavailable') }) }
+        : undefined,
+  })
+  await assert.rejects(refusing.files.list('session-1', '/work/root'), /workspace files are unavailable/)
+})
+
+test('the picker model lists a level, supersedes a stale one, and keeps a typed path on failure', async () => {
+  const { module: mod } = await loadClient()
+
+  const asked = []
+  const model = new mod.DirectoryPickerModel({
+    folders: (path) => {
+      asked.push(path)
+      return Promise.resolve(listingFixture())
+    },
+    root: '/work/root',
+    start: '/work/root/src',
+  })
+  await settle()
+
+  assert.deepEqual(asked, ['/work/root/src'], 'the opening level is listed, not guessed at')
+  assert.equal(model.getSnapshot().listing.base, '/work/root/src')
+  assert.equal(model.getSnapshot().draft, '/work/root/src', 'the field follows a successful listing')
+  assert.equal(model.getSnapshot().loading, false)
+
+  // A second navigation wins even when the first is still in flight: the
+  // sequence number is what stops an early listing landing on a later view.
+  model.open('/work/root/other')
+  model.setDraft('notes/CONTROLLER.md')
+
+  // A failure keeps the level on screen and the path as typed: a listing can
+  // fail on a path this panel may still legitimately declare.
+  const failing = new mod.DirectoryPickerModel({
+    folders: () =>
+      Promise.reject(Object.assign(new Error('transport'), { rpcError: { message: 'directory-unreadable' } })),
+    root: '/work/root',
+    start: 'notes/CONTROLLER.md',
+  })
+  await settle()
+  assert.equal(failing.getSnapshot().error, 'directory-unreadable', 'the Host business message is preferred')
+  assert.equal(failing.getSnapshot().draft, 'notes/CONTROLLER.md')
+})
+
+test('the picker lists folders, hides hidden ones until asked, and answers in declared form', async () => {
+  const { module: mod } = await loadClient()
+
+  const model = new mod.DirectoryPickerModel({
+    folders: () => Promise.resolve(listingFixture()),
+    root: '/work/root',
+    start: '/work/root/src',
+  })
+  await settle()
+
+  const picked = []
+  const render = () =>
+    mod.DirectoryPicker({
+      model,
+      root: '/work/root',
+      target: 'focus',
+      disabled: false,
+      onClose: () => {},
+      onPick: (path) => picked.push(path),
+    })
+
+  const tree = render()
+  assert.equal(tree.type, 'Modal')
+  assert.equal(tree.props.className, mod.PICKER_CLASS)
+  assert.equal(tree.props.title, 'Choose the focus folder')
+
+  // The level is the rows, one per listed folder; the trail above them is the
+  // ancestry, and a hidden entry stays hidden until the toggle asks for it.
+  const rowTitles = (node) =>
+    buttonsOf(node)
+      .filter((button) => button.props.className === mod.ROW_CLASS)
+      .map((button) => button.props.title)
+  assert.deepEqual(rowTitles(tree), ['/work/root/src/shared'])
+  assert.ok(
+    buttonsOf(tree).some((button) => button.props.title === '/work/root' && (button.children ?? [])[0] === 'root'),
+    'the trail offers the ancestry as jump targets',
+  )
+
+  // The footer's own action takes the field's value and hands it back in the
+  // declared form, so the workspace can move without the grant meaning
+  // something else.
+  const footer = tree.props.footer
+  const pickButton = footer.find((entry) => (entry.children ?? [])[0] === 'Set focus')
+  assert.notEqual(pickButton, undefined, 'the footer commits the picked path')
+  pickButton.props.onClick()
+  assert.deepEqual(picked, ['src'])
+
+  model.setShowHidden(true)
+  assert.deepEqual(rowTitles(render()), ['/work/root/src/shared', '/work/root/src/.git'])
+
+  // A row is a way down, not a pick: standing in the folder is what chooses it.
+  model.open('/work/root/other')
+  await settle()
+})
+
+test('the extras picker names what it accepts and says what the list holds', async () => {
+  const { module: mod } = await loadClient()
+
+  const model = new mod.DirectoryPickerModel({
+    folders: () => Promise.resolve(listingFixture()),
+    root: '/work/root',
+    start: '/work/root/src',
+  })
+  await settle()
+
+  const tree = mod.DirectoryPicker({
+    model,
+    root: '/work/root',
+    target: 'extra',
+    disabled: false,
+    onClose: () => {},
+    onPick: () => {},
+  })
+
+  // "folder or path" promised one thing and offered another. The rows now carry
+  // files, and the copy says what a row of each kind does.
+  assert.equal(tree.props.title, 'Add a path or a file')
+  const texts = textsOf(tree)
+  assert.ok(texts.includes('Path or file'), 'the field is named for what it accepts')
+  assert.ok(
+    texts.some((text) => text.includes('Folders open; a file is taken')),
+    'the copy explains what a file row does',
+  )
+  assert.ok(
+    buttonsOf(tree).some((button) => (button.children ?? [])[0] === 'Add'),
+    'the action is Add for an extra, not Set focus',
+  )
+})
+
+// ── files in the extras picker ───────────────────────────────────────────────
+//
+// Two Host listers, one of which carries files. The folder primitive browses
+// anywhere and returns folders; the workspace file listing returns files and
+// folders but confines itself to the session's workspace. The extras picker
+// takes the file listing wherever the Host allows it, and the folder listing
+// everywhere else, so a path above the session folder is still reachable.
+
+/** A level shaped the way `remote.workspaceFiles.list` answers. */
+function workspaceFixture() {
+  return {
+    path: 'src',
+    entries: [
+      { name: 'shared', type: 'directory' },
+      { name: '.git', type: 'directory' },
+      { name: 'index.ts', type: 'file', size: 120 },
+      { name: 'CONTROLLER.md', type: 'file', size: 900 },
+      { name: 'socket', type: 'other' },
+    ],
+    truncated: false,
+  }
+}
+
+test('the model takes the file listing inside the workspace and the folder listing above it', async () => {
+  const { module: mod } = await loadClient()
+
+  const asked = []
+  const model = new mod.DirectoryPickerModel({
+    folders: (path) => {
+      asked.push(['folders', path])
+      return Promise.resolve(listingFixture())
+    },
+    files: (sessionId, path) => {
+      asked.push(['files', sessionId, path])
+      return Promise.resolve(workspaceFixture())
+    },
+    sessionId: 'session-1',
+    root: '/work/root',
+    start: '/work/root/src',
+  })
+  await settle()
+
+  // Inside the workspace: the file listing, normalised into the picker's own
+  // shape, with the workspace-relative paths joined onto the session folder.
+  assert.deepEqual(asked, [['files', 'session-1', '/work/root/src']])
+  const level = model.getSnapshot().listing
+  assert.equal(level.base, '/work/root/src')
+  assert.equal(level.files, true, 'this level could carry file rows')
+  assert.deepEqual(
+    level.entries.map((entry) => [entry.name, entry.path, entry.directory, entry.hidden]),
+    [
+      ['shared', '/work/root/src/shared', true, false],
+      ['.git', '/work/root/src/.git', true, true],
+      ['index.ts', '/work/root/src/index.ts', false, false],
+      ['CONTROLLER.md', '/work/root/src/CONTROLLER.md', false, false],
+      ['socket', '/work/root/src/socket', false, false],
+    ],
+  )
+  // The trail is the workspace's own, root first: the file listing stops at the
+  // session folder, so there is nothing above it to offer.
+  assert.deepEqual(
+    level.crumbs.map((crumb) => crumb.path),
+    ['/work/root', '/work/root/src'],
+  )
+
+  // Above the workspace root: the Host confines the file listing to the
+  // workspace, so the level falls back to folders — which browse anywhere.
+  model.open('/work')
+  await settle()
+  assert.deepEqual(asked[1], ['folders', '/work'])
+  assert.equal(model.getSnapshot().listing.files, false)
+})
+
+test('a file listing that fails still leaves a browsable level', async () => {
+  const { module: mod } = await loadClient()
+
+  // The comparison the model makes is a prefix test on a path the Host may
+  // resolve differently — a symlinked session folder, say — so a refusal from
+  // the file listing is answered rather than shown: the folder listing runs.
+  const model = new mod.DirectoryPickerModel({
+    folders: () => Promise.resolve(listingFixture()),
+    files: () => Promise.reject(new Error('outside the workspace')),
+    sessionId: 'session-1',
+    root: '/work/root',
+    start: '/work/root/src',
+  })
+  await settle()
+
+  assert.equal(model.getSnapshot().error, '')
+  assert.equal(model.getSnapshot().listing.files, false)
+  assert.equal(model.getSnapshot().listing.base, '/work/root/src')
+})
+
+test('a file row is taken as the path to add rather than walked into', async () => {
+  const { module: mod } = await loadClient()
+
+  // Both listers refuse a path that names a file, which is what the Host does:
+  // the file listing because a file has no children, the folder listing because
+  // the same. Only a level can be listed.
+  const isFile = (path) => /\.(md|ts)$/.test(String(path))
+  const refuseFile = (path, answer) =>
+    isFile(path) ? Promise.reject(new Error('not a directory')) : Promise.resolve(answer)
+
+  const model = new mod.DirectoryPickerModel({
+    folders: (path) => refuseFile(path, listingFixture()),
+    files: (sessionId, path) => refuseFile(path, workspaceFixture()),
+    sessionId: 'session-1',
+    root: '/work/root',
+    start: '/work/root/src',
+  })
+  await settle()
+
+  const picked = []
+  const render = () =>
+    mod.DirectoryPicker({
+      model,
+      root: '/work/root',
+      target: 'extra',
+      disabled: false,
+      onClose: () => {},
+      onPick: (path) => picked.push(path),
+    })
+
+  const rowAt = (tree, path) =>
+    buttonsOf(tree)
+      .filter((button) => button.props.className === mod.ROW_CLASS)
+      .find((button) => button.props.title === path)
+
+  const fileRow = rowAt(render(), '/work/root/src/CONTROLLER.md')
+  assert.notEqual(fileRow, undefined, 'the file is a row in the listing')
+  assert.equal(fileRow.props.style.background, 'transparent', 'an unpicked file row is not marked')
+  // A folder row carries the folder glyph and a file row the file-type one, which
+  // is the only thing telling the two apart before the click.
+  const glyphOf = (row) => (row.children ?? [])[0].children?.[0]?.type
+  assert.equal(glyphOf(fileRow), 'FileTypeIcon')
+  assert.equal(glyphOf(rowAt(render(), '/work/root/src/shared')), 'IconFolderCloseRegular')
+
+  // Clicking it fills the field instead of listing it, and marks the row: a file
+  // is taken, not entered.
+  fileRow.props.onClick()
+  assert.equal(model.getSnapshot().draft, '/work/root/src/CONTROLLER.md')
+  assert.notEqual(rowAt(render(), '/work/root/src/CONTROLLER.md').props.style.background, 'transparent')
+
+  // Enter on a file the level lists asks for a listing of a file, which is not a
+  // failure: the level stays and nothing is reported.
+  model.open(model.getSnapshot().draft)
+  await settle()
+  assert.equal(model.getSnapshot().error, '')
+  assert.equal(model.getSnapshot().listing.base, '/work/root/src', 'the level survives it')
+
+  // The footer then adds exactly that, in the declared form.
+  const addButton = render().props.footer.find((entry) => (entry.children ?? [])[0] === 'Add')
+  addButton.props.onClick()
+  assert.deepEqual(picked, ['src/CONTROLLER.md'])
+})
+
+test('files are offered to the extras control only, and only where the Host has them', async () => {
+  const { module: mod } = await loadClient()
+
+  const browse = mod.directoryBrowse({
+    get: (name) => (name === 'remote.workspaceFiles' ? { list: () => {} } : undefined),
+  })
+  assert.equal(mod.fileLister(browse, 'extra'), browse.files.list, 'an extra can name a file')
+  // A focus is a folder, and file rows there would only offer something that
+  // cannot be chosen.
+  assert.equal(mod.fileLister(browse, 'focus'), undefined)
+  // No file service, or no browse face at all: the folder listing stands.
+  assert.equal(mod.fileLister(mod.directoryBrowse({ get: () => undefined }), 'extra'), undefined)
+  assert.equal(mod.fileLister({}, 'extra'), undefined)
+  assert.equal(mod.fileLister(undefined, 'extra'), undefined)
+})
+
+test('the picker says so when a level is folders only, and not when it is not', async () => {  const { module: mod } = await loadClient()
+
+  const model = new mod.DirectoryPickerModel({
+    folders: () => Promise.resolve(listingFixture()),
+    root: '/work/root',
+    start: '/work/root/src',
+  })
+  await settle()
+
+  const tree = mod.DirectoryPicker({
+    model,
+    root: '/work/root',
+    target: 'extra',
+    disabled: false,
+    onClose: () => {},
+    onPick: () => {},
+  })
+  assert.ok(
+    textsOf(tree).some((text) => text.includes('Files are listed inside the session folder only')),
+    'a folders-only level explains itself',
+  )
+
+  // A level that does carry files needs no note about it.
+  const withFiles = new mod.DirectoryPickerModel({
+    folders: () => Promise.resolve(listingFixture()),
+    files: () => Promise.resolve(workspaceFixture()),
+    sessionId: 'session-1',
+    root: '/work/root',
+    start: '/work/root/src',
+  })
+  await settle()
+  assert.equal(
+    textsOf(
+      mod.DirectoryPicker({
+        model: withFiles,
+        root: '/work/root',
+        target: 'extra',
+        disabled: false,
+        onClose: () => {},
+        onPick: () => {},
+      }),
+    ).some((text) => text.includes('Files are listed inside the session folder only')),
+    false,
+  )
 })

test/guard.test.js

@@ -170,13 +170,59 @@ test('a prefix is not a parent', async () => {
   assert.equal(decision.kind, 'ask')
 })
 
-test('an omitted path means the session directory, which is in scope', async () => {
+test('an omitted path means the session directory, which here is the facet', async () => {
   const { captured } = harness()
+  // Allowed because the default and the facet are the same folder — not because
+  // the call named nothing. The next test is the case where they differ.
   assert.deepEqual(await dispatch(captured, { name: 'glob', args: { pattern: '**/*.ts' }, agent: agent() }), {
     kind: 'allow',
   })
 })
 
+test('a search that names no path is judged against the directory it would cover', async () => {
+  // The session directory is the facet's parent here: the user narrowed this
+  // conversation to `inner`, while the search tools still default to the whole
+  // session directory. An absent argument is not an absent path — it is the
+  // default one, and the default one leaves the facet.
+  const { captured } = harness({ config: { mode: 'ask', scopes: { 'session-1': { focus: 'inner' } } } })
+
+  const decision = await dispatch(captured, { name: 'grep', args: { pattern: 'motion_learning' }, agent: agent() })
+  assert.equal(decision.kind, 'ask')
+  assert.match(decision.reason, /names no `path`/)
+  assert.match(decision.reason, /inner/, 'the reason names the boundary the call crossed')
+
+  // Naming the folder is the whole remedy, and it costs no grant.
+  assert.deepEqual(
+    await dispatch(captured, { name: 'grep', args: { pattern: 'x', path: 'inner' }, agent: agent() }),
+    { kind: 'allow' },
+  )
+  // The same rule reaches the other two tools whose default is a directory.
+  assert.equal(
+    (await dispatch(captured, { name: 'glob', args: { pattern: '**/*.ts' }, agent: agent() })).kind,
+    'ask',
+  )
+  assert.equal(
+    (await dispatch(captured, { name: 'recall', args: { query: 'motion learning' }, agent: agent() })).kind,
+    'ask',
+  )
+  // A tool with no path argument at all is still left alone: it has no default
+  // that could leave the facet.
+  assert.deepEqual(await dispatch(captured, { name: 'todo_write', args: { todos: [] }, agent: agent() }), {
+    kind: 'allow',
+  })
+})
+
+test('recall is judged on the scope it names, because that is what it will search', async () => {
+  const { captured } = harness({ config: { mode: 'deny', scopes: { 'session-1': { focus: 'inner' } } } })
+  assert.deepEqual(await dispatch(captured, { name: 'recall', args: { query: 'x', focus: 'inner' }, agent: agent() }), {
+    kind: 'allow',
+  })
+  assert.equal(
+    (await dispatch(captured, { name: 'recall', args: { query: 'x', path: '..' }, agent: agent() })).kind,
+    'deny',
+  )
+})
+
 test('tools the guard cannot judge are left alone, deliberately', async () => {
   const { captured } = harness()
   // A shell command cannot be read reliably from argv, so the facet is enforced
@@ -195,6 +241,84 @@ test('an agent with no working directory is not scoped', async () => {
   assert.deepEqual(await dispatch(captured, { name: 'read', args: { file_path: '/etc/hosts' } }), { kind: 'allow' })
 })
 
+// ── delegated sessions ───────────────────────────────────────────────────────
+//
+// A session spawned or forked from a scoped one has no declaration of its own,
+// and the user's declaration is keyed by session id. Without inheritance its
+// facet would be its own working directory — wider than the conversation it came
+// from, which is the one direction this plugin promises cannot happen.
+
+/** A session that was spawned from another, as the harness records lineage. */
+const childOf = (parentId, id = 'child-1', cwd = facet) => ({
+  session: { id, header: { cwd, parentSession: parentId } },
+})
+
+test('a session spawned from a scoped one starts inside the same facet', async () => {
+  const { captured } = harness({ config: { mode: 'ask', scopes: { 'session-1': { focus: 'inner' } } } })
+
+  // The parent's root is on the record as soon as it resolves a scope, which
+  // happens for every model request and every tool call — so before it can
+  // spawn anything.
+  assert.deepEqual(
+    await dispatch(captured, { name: 'read', args: { file_path: 'inner/index.ts' }, agent: agent() }),
+    { kind: 'allow' },
+  )
+
+  const child = childOf('session-1')
+  // Without inheritance this would be ordinary work for the child: its root
+  // would be the session directory, one level up from its parent's facet.
+  const decision = await dispatch(captured, { name: 'read', args: { file_path: 'index.ts' }, agent: child })
+  assert.equal(decision.kind, 'ask')
+  assert.match(decision.reason, /inner/)
+  // Inside the inherited facet is inside the child's scope, as it should be.
+  assert.deepEqual(
+    await dispatch(captured, { name: 'read', args: { file_path: 'inner/index.ts' }, agent: child }),
+    { kind: 'allow' },
+  )
+})
+
+test('inheritance holds at depth, and is not a way around a self-narrowing', async () => {
+  // No declaration: the user left the session at its directory, and the only
+  // thing that will keep a child inside `inner` is the inherited root.
+  const { captured } = harness({ config: { mode: 'deny' } })
+  await captured.tool.execute({ action: 'focus', paths: ['inner'] }, { agent: agent() })
+
+  const child = childOf('session-1')
+  const grandchild = childOf('child-1', 'grand-1')
+  // The child's own scope is resolved by its first call, which is what puts its
+  // root on the record for the grandchild to inherit.
+  for (const descendant of [child, grandchild]) {
+    assert.equal(
+      (await dispatch(captured, { name: 'read', args: { file_path: 'inner/index.ts' }, agent: descendant })).kind,
+      'allow',
+      `${descendant.session.id} is inside the inherited facet`,
+    )
+    assert.equal(
+      (await dispatch(captured, { name: 'read', args: { file_path: 'index.ts' }, agent: descendant })).kind,
+      'deny',
+      `${descendant.session.id} cannot delegate its way back out of the narrowing`,
+    )
+  }
+})
+
+test('a declaration for the child itself stands over what it would inherit', async () => {
+  const { captured } = harness({
+    config: { mode: 'ask', scopes: { 'session-1': { focus: 'inner' }, 'child-1': { focus: '.' } } },
+  })
+  assert.deepEqual(
+    await dispatch(captured, { name: 'read', args: { file_path: 'inner/index.ts' }, agent: agent() }),
+    { kind: 'allow' },
+  )
+
+  // The user is the authority on this session too: a declaration made for the
+  // child is a statement about the child, and inheritance only answers the case
+  // where they made none.
+  assert.deepEqual(
+    await dispatch(captured, { name: 'read', args: { file_path: 'index.ts' }, agent: childOf('session-1') }),
+    { kind: 'allow' },
+  )
+})
+
 test('a standing grant and a session grant both open the scope', async () => {
   const standing = harness({ extraRoots: ['../../shared'] })
   assert.deepEqual(

test/policy.test.js

@@ -187,3 +187,61 @@ test('junk in a declaration is ignored rather than thrown on', () => {
   assert.deepEqual(policy.scopeFor(agentAt('/w', 's1')).extras, ['/w/ok'])
   assert.equal(policy.scopeFor(agentAt('/w', 's2')).root, '/w')
 })
+
+// ── delegated sessions ───────────────────────────────────────────────────────
+//
+// A session spawned or forked from this one has no declaration of its own, and
+// the user's declaration is keyed by session id. What stops it starting wider
+// than its parent is the parent's own resolved root, recorded as the parent
+// resolves a scope — which it does for every model request and every tool call,
+// so the record is always there before it can spawn anything.
+
+/** An agent whose header carries the lineage the harness writes for a child. */
+const spawned = (id, parentSession, cwd = '/w') => ({
+  session: { id, header: { cwd, parentSession } },
+})
+
+test('a session spawned from a scoped one inherits its root, at any depth', () => {
+  const policy = createFacetPolicy({ mode: 'deny', scopes: { s1: { focus: 'src/room' } } })
+  assert.equal(policy.scopeFor(agentAt('/w', 's1')).root, '/w/src/room')
+
+  const child = spawned('c1', 's1')
+  assert.equal(policy.scopeFor(child).root, '/w/src/room')
+  // Relative paths still resolve from the child's own directory, as for anyone.
+  assert.equal(policy.scopeFor(child).cwd, '/w')
+  assert.equal(policy.scopeFor(spawned('g1', 'c1')).root, '/w/src/room')
+})
+
+test('a child is never wider than its parent is now, narrowing included', () => {
+  const policy = createFacetPolicy({ mode: 'deny' })
+  policy.narrowTo('s1', '/w/src/room')
+
+  // The narrowing is the agent's own decision; spawning a child is not a way to
+  // undo it, because the root the child inherits already includes it.
+  assert.equal(policy.scopeFor(agentAt('/w', 's1')).root, '/w/src/room')
+  assert.equal(policy.scopeFor(spawned('c1', 's1')).root, '/w/src/room')
+})
+
+test('a declaration for the child itself stands over what it would inherit', () => {
+  const policy = createFacetPolicy({ mode: 'deny', scopes: { s1: { focus: 'src/room' }, c1: { focus: '.' } } })
+  policy.scopeFor(agentAt('/w', 's1'))
+
+  // Inheritance answers the case where the user made no statement about this
+  // session; a statement they did make is the more specific one and stands.
+  assert.equal(policy.scopeFor(spawned('c1', 's1')).root, '/w')
+})
+
+test('a root is kept while a session that inherited it is still alive', () => {
+  const policy = createFacetPolicy({ mode: 'deny', scopes: { s1: { focus: 'src/room' } } })
+  const child = spawned('c1', 's1')
+  policy.scopeFor(agentAt('/w', 's1'))
+  policy.scopeFor(child)
+
+  // Disposing the parent must not quietly widen the child that is still running.
+  policy.forget('s1')
+  assert.equal(policy.scopeFor(child).root, '/w/src/room')
+
+  // With nothing left to inherit it, the record goes too.
+  policy.forget('c1')
+  assert.equal(policy.scopeFor(agentAt('/w', 's1')).root, '/w/src/room')
+})