diff --git a/AGENTS.md b/AGENTS.md
index 55ce7e55b..ed3b4fadd 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -163,7 +163,7 @@ The Bot team:
 ## Hard rules
 
 1. **Build on DSH; never patch it.** Bot features use the documented plugin APIs. The desktop app starts DSH only through its documented entry points (`@deepseek-ai/dsh/profile-boot`, the `dsh` CLI). Never patch DeepSeek Harness or depend on files inside a DSH install. If something is missing in DSH, stop and say so; do not work around it with a patch.
-2. **No secrets.** Never write, print or commit API keys, tokens, cookies or `DSH_HOME` contents. Use the mock model (`core/dev/mock-llm.mjs`) for tests; it needs no key.
+2. **No secrets.** Never write, print or commit API keys, tokens, cookies or `DSH_HOME` contents. Use the mock model (`core/dev/mock-llm.mjs`) for tests; it needs no key. A shell that holds no key this turn says why in `DSH_SECRETS_WITHHELD` (`NAME:reason`, never a value, #651): read the reason instead of assuming the owner did not configure it.
 3. **Only original material.** Do not copy code, text, icons, logos or graphics from other products or websites.
 4. **The core is ds-bot + patches.** Change `core/`, then run `node scripts/ds-bot-patches.mjs generate` and `check`, and commit `core/` and `patches/` together. CI fails if `ds-bot/` differs from the pin or `core/` differs from `ds-bot/` + patches.
 5. **`client.js` is generated.** Change `core/src/client/`, then run `npm run build` in `core/` and commit both files. Never edit `client.js` by hand.
diff --git a/changelog.d/651-secrets-withheld.fixed.md b/changelog.d/651-secrets-withheld.fixed.md
new file mode 100644
index 000000000..dde3bb054
--- /dev/null
+++ b/changelog.d/651-secrets-withheld.fixed.md
@@ -0,0 +1 @@
+A Bot's shell now says which saved key it withheld and why, instead of looking like the key was never saved: `DSH_SECRETS_WITHHELD` lists `NAME:reason` (never a value), `list_secrets` and `request_secret` name the same reason, and a key the owner scoped to one Bot still reaches that Bot's own scheduled turn while it is shared ([#651](https://github.com/ThinkFlowLab/FlyBot/issues/651)).
diff --git a/core/src/host/secrets.js b/core/src/host/secrets.js
index 47f41fb87..0b4365d46 100644
--- a/core/src/host/secrets.js
+++ b/core/src/host/secrets.js
@@ -7,7 +7,7 @@ import { chmod, mkdir, readFile, rename, unlink, writeFile } from 'node:fs/promi
 import { join } from 'node:path'
 import { defineTool } from '@deepseek-ai/dsh-tools'
 import { output } from './tools.js'
-import { OTHER, settled } from './turn-origin.js'
+import { OTHER, SCHEDULED, OWNER, settled, turnOrigin } from './turn-origin.js'
 
 export const SECRET_NAME = /^[A-Z][A-Z0-9_]{0,63}$/
 export const ENV_PREFIX = 'DSH_SECRET_'
@@ -21,6 +21,17 @@ const MAX_REQUESTS = 20
 const USED_SAVE_MS = 5000
 
 export const envName = name => `${ENV_PREFIX}${name}`
+// A shell this turn cannot use a key in says so instead of looking empty (#601, #651): names and a
+// reason, never a value, so "you did not configure it" and "it was withheld" stop looking the same.
+// The reasons are a closed set; a caller that adds one adds it here.
+export const WITHHELD_VAR = 'DSH_SECRETS_WITHHELD'
+export const WITHHELD_REASONS = Object.freeze({
+  REMOTE: 'remote-bot',
+  NOT_OWNER: 'turn-not-owner',
+  SHARED_SCHEDULED: 'shared-bot-scheduled',
+  SHARED_ROOM: 'shared-room',
+  UNKNOWN_TURN: 'unknown-turn',
+})
 export const canUse = (secret, botId) => secret !== undefined && botId !== undefined
   && (secret.scope === 'all' || (Array.isArray(secret.scope) && secret.scope.includes(botId)))
 
@@ -402,7 +413,11 @@ export function install(rt) {
       const name = normalizeName(args.name)
       if (!SECRET_NAME.test(name)) return 'Name the key with capitals, digits, and underscores, starting with a letter (for example GITHUB_TOKEN).'
       const secret = secrets.get(name)
-      if (canUse(secret, bot.id)) return `${name} is already saved and you may use it: ${usage(name)}. You cannot see the value; never print it.`
+      if (canUse(secret, bot.id)) {
+        const reason = withheldReason(secret, id, bot.id, bot)
+        if (reason !== undefined) return `${name} is saved for this Bot but withheld this turn: ${reason}. A key is only in the shell on the owner's own turn. You cannot see the value; never print it.`
+        return `${name} is already saved and you may use it: ${usage(name)}. You cannot see the value; never print it.`
+      }
       if (rt.groupOwners.has(id)) return 'Secret cards only work in your own chat. Tell the group you will ask the user in your own chat, and call request_secret there.'
       if (!rt.chatOwners.has(id)) return 'Secret cards only work in your current own chat.'
       const readOnly = rt.readOnly()
@@ -445,9 +460,16 @@ export function install(rt) {
       const self = callerOf(exec)
       if (rt.botOf(self) === undefined) return 'Only Bots on the team can use list_secrets.'
       if (secrets.size === 0) return 'No keys are saved yet. Ask for one with request_secret.'
+      const bot = rt.botOf(self)
+      // #651: say why a key is not in this turn's shell. A name and a reason, never a value.
+      const use = (secret) => {
+        if (!canUse(secrets.get(secret.name), self)) return 'you may not use it; ask with request_secret'
+        const reason = bot === undefined ? undefined : withheldReason(secrets.get(secret.name), exec.agent?.id, self, bot)
+        return reason === undefined ? `you may use it as $${envName(secret.name)}` : `withheld this turn: ${reason} — ask the user for the owner's turn`
+      }
       return [
         'Saved keys (values are never shown):',
-        ...secretsView().map(secret => `- ${secret.name}${secret.purpose ? ` — ${secret.purpose}` : ''} — for ${scopeText(secret.scope)} — ${canUse(secrets.get(secret.name), self) ? `you may use it as $${envName(secret.name)}` : 'you may not use it; ask with request_secret'}`),
+        ...secretsView().map(secret => `- ${secret.name}${secret.purpose ? ` — ${secret.purpose}` : ''} — for ${scopeText(secret.scope)} — ${use(secret)}`),
       ].join('\n')
     },
   }))
@@ -497,16 +519,37 @@ export function install(rt) {
     return rt.sharedWith(bot.id).length === 0
   }
 
+  // Why this key is not in the shell for the turn that is running, or undefined when it is. A key
+  // the owner scoped to this Bot by name (scope [<botId>]) is this Bot's own: it reaches the Bot's
+  // scheduled turn even while the Bot is shared, because the owner said which Bot may use it.
+  // scope 'all' is "you did not pick a Bot", so it keeps the fail-closed rule (#651 B).
+  const withheldReason = (secret, sessionId, botId, bot) => {
+    if (bot.remote !== undefined) return WITHHELD_REASONS.REMOTE
+    const origin = turnOrigin(rt, sessionId)
+    if (origin === OTHER) return WITHHELD_REASONS.NOT_OWNER
+    if (ownersTurn(sessionId, bot)) return undefined
+    const explicitForThisBot = Array.isArray(secret.scope) && secret.scope.includes(botId)
+    if (origin === SCHEDULED) return explicitForThisBot ? undefined : WITHHELD_REASONS.SHARED_SCHEDULED
+    if (origin === OWNER) return WITHHELD_REASONS.SHARED_ROOM
+    return WITHHELD_REASONS.UNKNOWN_TURN
+  }
+
   function resolveEnv(execution) {
     const sessionId = execution?.agent?.session?.header?.id ?? execution?.agent?.id
     const botId = rt.selfOf(sessionId)
     const bot = rt.botOf(botId)
-    if (bot === undefined || bot.remote !== undefined || !ownersTurn(sessionId, bot)) return {}
+    if (bot === undefined) return {}
     const command = typeof execution.arguments?.command === 'string' ? execution.arguments.command : ''
     const values = {}
+    const withheld = []
     let used = false
     for (const secret of secrets.values()) {
       if (!canUse(secret, botId)) continue
+      const reason = withheldReason(secret, sessionId, botId, bot)
+      if (reason !== undefined) {
+        withheld.push(`${secret.name}:${reason}`)
+        continue
+      }
       values[envName(secret.name)] = secret.value
       if (command.includes(envName(secret.name))) {
         secret.lastUsedAt = Date.now()
@@ -514,6 +557,7 @@ export function install(rt) {
       }
     }
     if (used) noteUsed()
+    if (withheld.length) values[WITHHELD_VAR] = withheld.join(',')
     return values
   }
 
diff --git a/core/src/host/turn-origin.js b/core/src/host/turn-origin.js
index 425b48981..52e35c748 100644
--- a/core/src/host/turn-origin.js
+++ b/core/src/host/turn-origin.js
@@ -105,6 +105,13 @@ export function combine(a, b) {
   return a === SCHEDULED || b === SCHEDULED ? SCHEDULED : OWNER
 }
 
+// The verdict the running turn recorded, before `settled` narrows it. `scheduled` is the one a caller
+// cannot get anywhere else: on a shared Bot it is 'other' as a permission, and still 'scheduled' as
+// a fact, which is what a caller needs to say why a turn is not the owner's (#651).
+export function turnOrigin(rt, sessionId, entry = rt.live?.get(sessionId)) {
+  return entry?.turn === undefined ? undefined : entry.origin
+}
+
 // The verdict that holds right now for the turn a Session is running: 'owner', 'other', or
 // undefined when the Session runs no turn or no message of it carried a verdict. `entry` is the
 // Session's `rt.live` record; the checks here read the team as it is at this moment, so a person
diff --git a/core/test/secrets.test.js b/core/test/secrets.test.js
index 2f3120c8d..65307c310 100644
--- a/core/test/secrets.test.js
+++ b/core/test/secrets.test.js
@@ -276,7 +276,7 @@ test('a key saved for no Bot by the old default is moved to all Bots once; an ex
   const kept = fresh()
   const picked = fresh()
   const at = { createdAt: 1, updatedAt: 1, requestedBy: null, purpose: '' }
-  const bench = start({ secrets: [
+  const bench = await seeded({ secrets: [
     { name: 'GITHUB_TOKEN', value: github, scope: [], ...at, purpose: 'GitHub connector' },
     { name: 'NOBODY_KEY', value: kept, scope: [], scopeSet: true, ...at },
     { name: 'WRITER_KEY', value: picked, scope: ['b2'], ...at },
@@ -313,7 +313,7 @@ test('a key for all Bots stays out of a shared Bot\'s shell when the turn is not
   t.after(bench.stop)
   await bench.call('secret-set', { name: 'GITHUB_TOKEN', value })
   assert.deepEqual(bench.env('b2'), { DSH_SECRET_GITHUB_TOKEN: value })
-  assert.deepEqual(bench.env('c3'), {})
+  assert.deepEqual(bench.env('c3'), { DSH_SECRETS_WITHHELD: 'GITHUB_TOKEN:unknown-turn' })
 })
 
 test('tool results and model requests lose the values', async (t) => {
@@ -351,3 +351,79 @@ test('tool results and model requests lose the values', async (t) => {
   stream({ ...options, system: 'clean', messages: [] }, next)
   assert.equal(passed.length, 2)
 })
+
+// #651: a shell says which key was withheld and why, never the value. Before this, `resolveEnv`
+// returned `{}` and "the owner did not configure it" and "it was withheld" looked the same.
+const SHARED = { ...TEAM, grants: { b2: [{ grantee: '@bob.home', name: 'Bob' }] } }
+const saved = scope => [{ name: 'GITHUB_TOKEN', value: 'ghp_testvalue_123', scope, purpose: 'GitHub' }]
+// The seed is read asynchronously, so one state read settles it before the shell is asked.
+const seeded = async options => { const bench = start(options); await bench.view(); return bench }
+
+test('#651: the owner’s own turn gets the key and says nothing about withholding', async (t) => {
+  const bench = await seeded({ secrets: saved('all') })
+  t.after(bench.stop)
+  bench.ctx.emitArgs('session/event', { id: 'b2' }, { type: 'turn/start', data: { turn: 1 } })
+  bench.ctx.emitArgs('session/event', { id: 'b2' }, { type: 'user/message', data: { content: [], source: { kind: 'user' } } })
+  const env = bench.env('b2')
+  assert.deepEqual(env, { DSH_SECRET_GITHUB_TOKEN: 'ghp_testvalue_123' })
+  assert.equal(env.DSH_SECRETS_WITHHELD, undefined)
+})
+
+test('#651: someone else’s turn names the key and the reason, and carries no value', async (t) => {
+  const bench = await seeded({ secrets: saved('all') })
+  t.after(bench.stop)
+  bench.ctx.emitArgs('session/event', { id: 'b2' }, { type: 'turn/start', data: { turn: 1 } })
+  bench.ctx.emitArgs('session/event', { id: 'b2' }, { type: 'user/message', data: { content: [], source: { kind: 'user', authorId: 'ann' } } })
+  const env = bench.env('b2')
+  assert.deepEqual(env, { DSH_SECRETS_WITHHELD: 'GITHUB_TOKEN:turn-not-owner' })
+  assert.ok(!JSON.stringify(env).includes('ghp_testvalue_123'), 'no value anywhere in the shell env')
+})
+
+test('#651: a friend’s Bot says remote-bot, and a host with no key says nothing at all', async (t) => {
+  const friend = {
+    ...TEAM,
+    bots: { ...TEAM.bots, f9: { id: 'f9', sessionId: 'f9', name: 'Pal', role: '友', instructions: '', createdAt: 9, remote: { handle: '@pal.ann.home' } } },
+  }
+  const bench = await seeded({ secrets: saved('all'), team: friend })
+  t.after(bench.stop)
+  const env = bench.env('f9')
+  assert.deepEqual(env, { DSH_SECRETS_WITHHELD: 'GITHUB_TOKEN:remote-bot' })
+  assert.ok(!JSON.stringify(env).includes('ghp_testvalue_123'))
+
+  // Nothing saved: the same `{}` as before, and the tool says so in those words (#651).
+  const empty = start()
+  t.after(empty.stop)
+  assert.deepEqual(empty.env('b2'), {})
+  const listed = await empty.tool('list_secrets', {}, 'b2')
+  assert.match(listed.text, /No keys are saved yet/)
+  assert.ok(!listed.text.includes('withheld'))
+})
+
+test('#651: a shared Bot’s scheduled turn withholds scope "all" and keeps it for the Bot it names', async (t) => {
+  const sharedAll = await seeded({ secrets: saved('all'), team: SHARED })
+  t.after(sharedAll.stop)
+  sharedAll.ctx.emitArgs('session/event', { id: 'b2' }, { type: 'turn/start', data: { turn: 1 } })
+  sharedAll.ctx.emitArgs('session/event', { id: 'b2' }, { type: 'user/message', data: { content: [], source: { kind: 'schedule' } } })
+  assert.deepEqual(sharedAll.env('b2'), { DSH_SECRETS_WITHHELD: 'GITHUB_TOKEN:shared-bot-scheduled' })
+
+  // The owner said which Bot may use this key, so that Bot's own scheduled turn still has it.
+  const sharedThis = await seeded({ secrets: saved(['b2']), team: SHARED })
+  t.after(sharedThis.stop)
+  sharedThis.ctx.emitArgs('session/event', { id: 'b2' }, { type: 'turn/start', data: { turn: 1 } })
+  sharedThis.ctx.emitArgs('session/event', { id: 'b2' }, { type: 'user/message', data: { content: [], source: { kind: 'schedule' } } })
+  assert.deepEqual(sharedThis.env('b2'), { DSH_SECRET_GITHUB_TOKEN: 'ghp_testvalue_123' })
+})
+
+test('#651: list_secrets and request_secret give the same reason, and never a value', async (t) => {
+  const bench = await seeded({ secrets: saved('all') })
+  t.after(bench.stop)
+  bench.ctx.emitArgs('session/event', { id: 'b2' }, { type: 'turn/start', data: { turn: 1 } })
+  bench.ctx.emitArgs('session/event', { id: 'b2' }, { type: 'user/message', data: { content: [], source: { kind: 'user', authorId: 'ann' } } })
+  const listed = await bench.tool('list_secrets', {}, 'b2')
+  assert.match(listed.text, /GITHUB_TOKEN/)
+  assert.match(listed.text, /withheld this turn: turn-not-owner/)
+  assert.ok(!listed.text.includes('ghp_testvalue_123'))
+  const asked = await bench.tool('request_secret', { name: 'GITHUB_TOKEN', purpose: 'GitHub' }, 'b2')
+  assert.match(asked.text, /withheld this turn: turn-not-owner/)
+  assert.ok(!asked.text.includes('ghp_testvalue_123'))
+})
diff --git a/docs/subsystems/core-host.md b/docs/subsystems/core-host.md
index 32f2a8952..72c51a660 100644
--- a/docs/subsystems/core-host.md
+++ b/docs/subsystems/core-host.md
@@ -209,6 +209,10 @@ Work a member hands a Bot with `message_bot` from its group Session runs in a hi
 
 A key the owner saves is for **all of the owner's Bots** (`scope: 'all'`) unless the owner narrows it: a card's "Only <Bot>", the Secrets page's *Chosen Bots* or *No Bot*. That holds for a connector key too (`GITHUB_TOKEN`, `COMPOSIO_API_KEY`): `connector-connect` no longer passes `scope: []`, and a reconnect keeps the scope the key already has. A scope the owner chose is stored with `scopeSet: true` (`secret-update`, `secret-set` with a `scope`, a card's "Only <Bot>", and a deleted Bot leaving a picked list), so an empty list stays "No Bot". On load, an empty list **without** `scopeSet` is the old connector default and becomes `'all'` once (written back by the host that holds the team; a reading host widens it in memory only). An empty list the owner picked before #545 carries no marker and is widened too: there is no way to tell it apart. `'all'` is the owner's own use, the same rule as the connector tools: a Bot's shell gets the keys only on the owner's own turn (`settled` in `turn-origin.js`; a turn someone else started gets none), and outside a known turn only while the Bot is shared with nobody (`rt.sharedWith`); a friend's Bot (`remote`) never does. The boundary as measured on 2026-10-21 (#581): a Bot's **own** scheduled turn already counts as the owner's while that Bot is not shared, so a routine whose timer fires in its own Session gets the keys; a **group** round inherits the initiator's verdict, so a round a *shared* Bot opened on a scheduled turn reaches every member as `other` — the shared initiator by design, and the unshared members only because the relay carries that verdict — and none of them gets the keys. The routines avoid it by scheduling themselves in their own, unshared Sessions; that is a runtime route, no code change (#581, closed). A capability (`canUseSecret`) mounts for the whole Agent, so on a Bot shared with anyone it gets only a key whose list names that Bot, never an `'all'` key. Owner decision 2026-10-20 (#359, AGENTS.md hard rule 4).
 
+### A withheld key says why (#651)
+
+A key that is not in this turn's shell used to look exactly like a key the owner never saved: `resolveEnv` returned `{}` and the Bot reported "no key configured". Now `resolveEnv` writes `DSH_SECRETS_WITHHELD` — a comma-separated `NAME:reason` list, never a value — with one reason from a closed set: `remote-bot` (a friend's Bot), `turn-not-owner` (the turn carries someone else's words), `shared-bot-scheduled` (a shared Bot's own scheduled turn holding an `'all'` key), `shared-room` (a room turn on a shared Bot) and `unknown-turn` (no turn recorded). `withheldReason` is the single source: `resolveEnv`, `list_secrets` and the `request_secret` answer all read it, so the shell and the tool text name the same reason. To tell a scheduled turn apart from a room turn, `turnOrigin(rt, sessionId)` returns the turn's recorded verdict before `settled` narrows it: on a shared Bot `settled` answers `other` for both, while `turnOrigin` still says `scheduled`. A key whose list names this Bot (`scope: [<botId>]`) therefore reaches that Bot's own scheduled turn even while it is shared; `scope: 'all'` keeps the fail-closed rule, because it means "the owner did not pick a Bot". Tests: the four `#651` cases in `core/test/secrets.test.js`.
+
 ### Per-Bot connector access (#335, #369)
 
 The connector tools are mounted once for the whole DSH profile, so who may use them through a Bot is decided in `src/host/connector-access.js`, from two things: **whose turn it is** and the Bot's two switches.
diff --git a/patches/ds-bot/0014-flybot-branding.patch b/patches/ds-bot/0014-flybot-branding.patch
index f9521b353..2533b5425 100644
--- a/patches/ds-bot/0014-flybot-branding.patch
+++ b/patches/ds-bot/0014-flybot-branding.patch
@@ -491,10 +491,28 @@ diff --git a/src/host/secrets.js b/src/host/secrets.js
  import { join } from 'node:path'
  import { defineTool } from '@deepseek-ai/dsh-tools'
  import { output } from './tools.js'
-+import { OTHER, settled } from './turn-origin.js'
++import { OTHER, SCHEDULED, OWNER, settled, turnOrigin } from './turn-origin.js'
  
  export const SECRET_NAME = /^[A-Z][A-Z0-9_]{0,63}$/
  export const ENV_PREFIX = 'DSH_SECRET_'
+@@ -20,6 +20,17 @@ const MAX_REQUESTS = 20
+ const USED_SAVE_MS = 5000
+ 
+ export const envName = name => `${ENV_PREFIX}${name}`
++// A shell this turn cannot use a key in says so instead of looking empty (#601, #651): names and a
++// reason, never a value, so "you did not configure it" and "it was withheld" stop looking the same.
++// The reasons are a closed set; a caller that adds one adds it here.
++export const WITHHELD_VAR = 'DSH_SECRETS_WITHHELD'
++export const WITHHELD_REASONS = Object.freeze({
++  REMOTE: 'remote-bot',
++  NOT_OWNER: 'turn-not-owner',
++  SHARED_SCHEDULED: 'shared-bot-scheduled',
++  SHARED_ROOM: 'shared-room',
++  UNKNOWN_TURN: 'unknown-turn',
++})
+ export const canUse = (secret, botId) => secret !== undefined && botId !== undefined
+   && (secret.scope === 'all' || (Array.isArray(secret.scope) && secret.scope.includes(botId)))
+ 
 @@ -81,7 +81,9 @@ export function install(rt) {
    const { ctx, home, state } = rt
    const path = join(home, 'secrets.json')
@@ -601,7 +619,38 @@ diff --git a/src/host/secrets.js b/src/host/secrets.js
      }
    }
  
-@@ -465,9 +465,21 @@ export function install(rt) {
+@@ -380,7 +380,11 @@ export function install(rt) {
+       const name = normalizeName(args.name)
+       if (!SECRET_NAME.test(name)) return 'Name the key with capitals, digits, and underscores, starting with a letter (for example GITHUB_TOKEN).'
+       const secret = secrets.get(name)
+-      if (canUse(secret, bot.id)) return `${name} is already saved and you may use it: ${usage(name)}. You cannot see the value; never print it.`
++      if (canUse(secret, bot.id)) {
++        const reason = withheldReason(secret, id, bot.id, bot)
++        if (reason !== undefined) return `${name} is saved for this Bot but withheld this turn: ${reason}. A key is only in the shell on the owner's own turn. You cannot see the value; never print it.`
++        return `${name} is already saved and you may use it: ${usage(name)}. You cannot see the value; never print it.`
++      }
+       if (rt.groupOwners.has(id)) return 'Secret cards only work in your own chat. Tell the group you will ask the user in your own chat, and call request_secret there.'
+       if (!rt.chatOwners.has(id)) return 'Secret cards only work in your current own chat.'
+       const readOnly = rt.readOnly()
+@@ -423,9 +423,16 @@ export function install(rt) {
+       const self = callerOf(exec)
+       if (rt.botOf(self) === undefined) return 'Only Bots on the team can use list_secrets.'
+       if (secrets.size === 0) return 'No keys are saved yet. Ask for one with request_secret.'
++      const bot = rt.botOf(self)
++      // #651: say why a key is not in this turn's shell. A name and a reason, never a value.
++      const use = (secret) => {
++        if (!canUse(secrets.get(secret.name), self)) return 'you may not use it; ask with request_secret'
++        const reason = bot === undefined ? undefined : withheldReason(secrets.get(secret.name), exec.agent?.id, self, bot)
++        return reason === undefined ? `you may use it as $${envName(secret.name)}` : `withheld this turn: ${reason} — ask the user for the owner's turn`
++      }
+       return [
+         'Saved keys (values are never shown):',
+-        ...secretsView().map(secret => `- ${secret.name}${secret.purpose ? ` — ${secret.purpose}` : ''} — for ${scopeText(secret.scope)} — ${canUse(secrets.get(secret.name), self) ? `you may use it as $${envName(secret.name)}` : 'you may not use it; ask with request_secret'}`),
++        ...secretsView().map(secret => `- ${secret.name}${secret.purpose ? ` — ${secret.purpose}` : ''} — for ${scopeText(secret.scope)} — ${use(secret)}`),
+       ].join('\n')
+     },
+   }))
+@@ -465,14 +465,47 @@ export function install(rt) {
      return ctx.llm.stream({ ...options, messages: fresh, ...(system !== undefined ? { system } : {}) })
    })
  
@@ -614,6 +663,21 @@ diff --git a/src/host/secrets.js b/src/host/secrets.js
 +    if (verdict !== undefined) return verdict !== OTHER
 +    return rt.sharedWith(bot.id).length === 0
 +  }
++
++  // Why this key is not in the shell for the turn that is running, or undefined when it is. A key
++  // the owner scoped to this Bot by name (scope [<botId>]) is this Bot's own: it reaches the Bot's
++  // scheduled turn even while the Bot is shared, because the owner said which Bot may use it.
++  // scope 'all' is "you did not pick a Bot", so it keeps the fail-closed rule (#651 B).
++  const withheldReason = (secret, sessionId, botId, bot) => {
++    if (bot.remote !== undefined) return WITHHELD_REASONS.REMOTE
++    const origin = turnOrigin(rt, sessionId)
++    if (origin === OTHER) return WITHHELD_REASONS.NOT_OWNER
++    if (ownersTurn(sessionId, bot)) return undefined
++    const explicitForThisBot = Array.isArray(secret.scope) && secret.scope.includes(botId)
++    if (origin === SCHEDULED) return explicitForThisBot ? undefined : WITHHELD_REASONS.SHARED_SCHEDULED
++    if (origin === OWNER) return WITHHELD_REASONS.SHARED_ROOM
++    return WITHHELD_REASONS.UNKNOWN_TURN
++  }
 +
    function resolveEnv(execution) {
 -    const botId = rt.selfOf(execution?.agent?.session?.header?.id ?? execution?.agent?.id)
@@ -621,10 +685,29 @@ diff --git a/src/host/secrets.js b/src/host/secrets.js
 +    const sessionId = execution?.agent?.session?.header?.id ?? execution?.agent?.id
 +    const botId = rt.selfOf(sessionId)
 +    const bot = rt.botOf(botId)
-+    if (bot === undefined || bot.remote !== undefined || !ownersTurn(sessionId, bot)) return {}
++    if (bot === undefined) return {}
      const command = typeof execution.arguments?.command === 'string' ? execution.arguments.command : ''
      const values = {}
++    const withheld = []
      let used = false
+     for (const secret of secrets.values()) {
+       if (!canUse(secret, botId)) continue
++      const reason = withheldReason(secret, sessionId, botId, bot)
++      if (reason !== undefined) {
++        withheld.push(`${secret.name}:${reason}`)
++        continue
++      }
+       values[envName(secret.name)] = secret.value
+       if (command.includes(envName(secret.name))) {
+         secret.lastUsedAt = Date.now()
+@@ -480,6 +480,7 @@ export function install(rt) {
+       }
+     }
+     if (used) noteUsed()
++    if (withheld.length) values[WITHHELD_VAR] = withheld.join(',')
+     return values
+   }
+ 
 @@ -499,7 +499,7 @@ export function install(rt) {
        try {
          unregister = sub.shellEnv.register({
@@ -928,7 +1011,7 @@ diff --git a/test/secrets.test.js b/test/secrets.test.js
 +  const kept = fresh()
 +  const picked = fresh()
 +  const at = { createdAt: 1, updatedAt: 1, requestedBy: null, purpose: '' }
-+  const bench = start({ secrets: [
++  const bench = await seeded({ secrets: [
 +    { name: 'GITHUB_TOKEN', value: github, scope: [], ...at, purpose: 'GitHub connector' },
 +    { name: 'NOBODY_KEY', value: kept, scope: [], scopeSet: true, ...at },
 +    { name: 'WRITER_KEY', value: picked, scope: ['b2'], ...at },
@@ -965,12 +1048,92 @@ diff --git a/test/secrets.test.js b/test/secrets.test.js
 +  t.after(bench.stop)
 +  await bench.call('secret-set', { name: 'GITHUB_TOKEN', value })
 +  assert.deepEqual(bench.env('b2'), { DSH_SECRET_GITHUB_TOKEN: value })
-+  assert.deepEqual(bench.env('c3'), {})
++  assert.deepEqual(bench.env('c3'), { DSH_SECRETS_WITHHELD: 'GITHUB_TOKEN:unknown-turn' })
 +})
 +
  test('tool results and model requests lose the values', async (t) => {
    const bench = start()
    t.after(bench.stop)
+@@ -302,3 +302,79 @@ test('tool results and model requests lose the values', async (t) => {
+   stream({ ...options, system: 'clean', messages: [] }, next)
+   assert.equal(passed.length, 2)
+ })
++
++// #651: a shell says which key was withheld and why, never the value. Before this, `resolveEnv`
++// returned `{}` and "the owner did not configure it" and "it was withheld" looked the same.
++const SHARED = { ...TEAM, grants: { b2: [{ grantee: '@bob.home', name: 'Bob' }] } }
++const saved = scope => [{ name: 'GITHUB_TOKEN', value: 'ghp_testvalue_123', scope, purpose: 'GitHub' }]
++// The seed is read asynchronously, so one state read settles it before the shell is asked.
++const seeded = async options => { const bench = start(options); await bench.view(); return bench }
++
++test('#651: the owner’s own turn gets the key and says nothing about withholding', async (t) => {
++  const bench = await seeded({ secrets: saved('all') })
++  t.after(bench.stop)
++  bench.ctx.emitArgs('session/event', { id: 'b2' }, { type: 'turn/start', data: { turn: 1 } })
++  bench.ctx.emitArgs('session/event', { id: 'b2' }, { type: 'user/message', data: { content: [], source: { kind: 'user' } } })
++  const env = bench.env('b2')
++  assert.deepEqual(env, { DSH_SECRET_GITHUB_TOKEN: 'ghp_testvalue_123' })
++  assert.equal(env.DSH_SECRETS_WITHHELD, undefined)
++})
++
++test('#651: someone else’s turn names the key and the reason, and carries no value', async (t) => {
++  const bench = await seeded({ secrets: saved('all') })
++  t.after(bench.stop)
++  bench.ctx.emitArgs('session/event', { id: 'b2' }, { type: 'turn/start', data: { turn: 1 } })
++  bench.ctx.emitArgs('session/event', { id: 'b2' }, { type: 'user/message', data: { content: [], source: { kind: 'user', authorId: 'ann' } } })
++  const env = bench.env('b2')
++  assert.deepEqual(env, { DSH_SECRETS_WITHHELD: 'GITHUB_TOKEN:turn-not-owner' })
++  assert.ok(!JSON.stringify(env).includes('ghp_testvalue_123'), 'no value anywhere in the shell env')
++})
++
++test('#651: a friend’s Bot says remote-bot, and a host with no key says nothing at all', async (t) => {
++  const friend = {
++    ...TEAM,
++    bots: { ...TEAM.bots, f9: { id: 'f9', sessionId: 'f9', name: 'Pal', role: '友', instructions: '', createdAt: 9, remote: { handle: '@pal.ann.home' } } },
++  }
++  const bench = await seeded({ secrets: saved('all'), team: friend })
++  t.after(bench.stop)
++  const env = bench.env('f9')
++  assert.deepEqual(env, { DSH_SECRETS_WITHHELD: 'GITHUB_TOKEN:remote-bot' })
++  assert.ok(!JSON.stringify(env).includes('ghp_testvalue_123'))
++
++  // Nothing saved: the same `{}` as before, and the tool says so in those words (#651).
++  const empty = start()
++  t.after(empty.stop)
++  assert.deepEqual(empty.env('b2'), {})
++  const listed = await empty.tool('list_secrets', {}, 'b2')
++  assert.match(listed.text, /No keys are saved yet/)
++  assert.ok(!listed.text.includes('withheld'))
++})
++
++test('#651: a shared Bot’s scheduled turn withholds scope "all" and keeps it for the Bot it names', async (t) => {
++  const sharedAll = await seeded({ secrets: saved('all'), team: SHARED })
++  t.after(sharedAll.stop)
++  sharedAll.ctx.emitArgs('session/event', { id: 'b2' }, { type: 'turn/start', data: { turn: 1 } })
++  sharedAll.ctx.emitArgs('session/event', { id: 'b2' }, { type: 'user/message', data: { content: [], source: { kind: 'schedule' } } })
++  assert.deepEqual(sharedAll.env('b2'), { DSH_SECRETS_WITHHELD: 'GITHUB_TOKEN:shared-bot-scheduled' })
++
++  // The owner said which Bot may use this key, so that Bot's own scheduled turn still has it.
++  const sharedThis = await seeded({ secrets: saved(['b2']), team: SHARED })
++  t.after(sharedThis.stop)
++  sharedThis.ctx.emitArgs('session/event', { id: 'b2' }, { type: 'turn/start', data: { turn: 1 } })
++  sharedThis.ctx.emitArgs('session/event', { id: 'b2' }, { type: 'user/message', data: { content: [], source: { kind: 'schedule' } } })
++  assert.deepEqual(sharedThis.env('b2'), { DSH_SECRET_GITHUB_TOKEN: 'ghp_testvalue_123' })
++})
++
++test('#651: list_secrets and request_secret give the same reason, and never a value', async (t) => {
++  const bench = await seeded({ secrets: saved('all') })
++  t.after(bench.stop)
++  bench.ctx.emitArgs('session/event', { id: 'b2' }, { type: 'turn/start', data: { turn: 1 } })
++  bench.ctx.emitArgs('session/event', { id: 'b2' }, { type: 'user/message', data: { content: [], source: { kind: 'user', authorId: 'ann' } } })
++  const listed = await bench.tool('list_secrets', {}, 'b2')
++  assert.match(listed.text, /GITHUB_TOKEN/)
++  assert.match(listed.text, /withheld this turn: turn-not-owner/)
++  assert.ok(!listed.text.includes('ghp_testvalue_123'))
++  const asked = await bench.tool('request_secret', { name: 'GITHUB_TOKEN', purpose: 'GitHub' }, 'b2')
++  assert.match(asked.text, /withheld this turn: turn-not-owner/)
++  assert.ok(!asked.text.includes('ghp_testvalue_123'))
++})
 diff --git a/test/store.test.js b/test/store.test.js
 --- a/test/store.test.js
 +++ b/test/store.test.js
diff --git a/patches/ds-bot/files/src/host/turn-origin.js b/patches/ds-bot/files/src/host/turn-origin.js
index 425b48981..52e35c748 100644
--- a/patches/ds-bot/files/src/host/turn-origin.js
+++ b/patches/ds-bot/files/src/host/turn-origin.js
@@ -105,6 +105,13 @@ export function combine(a, b) {
   return a === SCHEDULED || b === SCHEDULED ? SCHEDULED : OWNER
 }
 
+// The verdict the running turn recorded, before `settled` narrows it. `scheduled` is the one a caller
+// cannot get anywhere else: on a shared Bot it is 'other' as a permission, and still 'scheduled' as
+// a fact, which is what a caller needs to say why a turn is not the owner's (#651).
+export function turnOrigin(rt, sessionId, entry = rt.live?.get(sessionId)) {
+  return entry?.turn === undefined ? undefined : entry.origin
+}
+
 // The verdict that holds right now for the turn a Session is running: 'owner', 'other', or
 // undefined when the Session runs no turn or no message of it carried a verdict. `entry` is the
 // Session's `rt.live` record; the checks here read the team as it is at this moment, so a person