diff --git a/src/cli/command-spec.ts b/src/cli/command-spec.ts
index 1922888a292..dbb28a66d71 100644
--- a/src/cli/command-spec.ts
+++ b/src/cli/command-spec.ts
@@ -15,8 +15,13 @@ export type CommandSpec = {
   positionalArgs?: string[]
   examples?: string[]
   notes?: string[]
+  // Why: `--from`/`--terminal` names either the acting caller or a target, and only the spec can
+  // say which. An agent session refuses a caller flag naming anyone else before dispatch.
+  identityFlagRoles?: Partial<Record<IdentityFlag, 'caller' | 'target'>>
 }
 
+export type IdentityFlag = 'from' | 'terminal'
+
 export function specPaths(spec: CommandSpec): string[][] {
   return spec.aliases ? [spec.path, ...spec.aliases] : [spec.path]
 }
diff --git a/src/cli/handlers/orchestration/dispatch-handlers.ts b/src/cli/handlers/orchestration/dispatch-handlers.ts
index 5162ca6e291..5f28d4bbcd3 100644
--- a/src/cli/handlers/orchestration/dispatch-handlers.ts
+++ b/src/cli/handlers/orchestration/dispatch-handlers.ts
@@ -5,7 +5,8 @@ import { RuntimeClientError } from '../../runtime-client'
 import { orchestrationMigrationData } from '../../../shared/orchestration-rpc-contract'
 import { callOrchestrationMutation } from './mutation-request'
 import { isDevCliInvocation } from './runtime-compatibility'
-import { injectedSessionAddress, resolveCoordinatorTerminalHandle } from './terminal-identity'
+import { resolveCoordinatorTerminalHandle } from './terminal-identity'
+import { injectedSessionAddress } from '../../session-caller-flags'
 
 export const ORCHESTRATION_DISPATCH_HANDLER: Record<string, CommandHandler> = {
   'orchestration dispatch': async ({ flags, client, cwd, json }) => {
diff --git a/src/cli/handlers/orchestration/gate-handlers.ts b/src/cli/handlers/orchestration/gate-handlers.ts
index 9af0faa1be9..f9ec4c6583f 100644
--- a/src/cli/handlers/orchestration/gate-handlers.ts
+++ b/src/cli/handlers/orchestration/gate-handlers.ts
@@ -2,10 +2,7 @@ import type { CommandHandler } from '../../dispatch'
 import { printResult } from '../../format'
 import { getOptionalJsonFlag, getOptionalStringFlag, getRequiredStringFlag } from '../../flags'
 import { callOrchestrationMutation } from './mutation-request'
-import {
-  refuseConflictingSessionCaller,
-  resolveCoordinatorTerminalHandle
-} from './terminal-identity'
+import { resolveCoordinatorTerminalHandle } from './terminal-identity'
 
 export const ORCHESTRATION_GATE_HANDLERS: Record<string, CommandHandler> = {
   'orchestration gate-create': async ({ flags, client, cwd, json }) => {
@@ -40,9 +37,7 @@ export const ORCHESTRATION_GATE_HANDLERS: Record<string, CommandHandler> = {
   'orchestration gate-list': async ({ flags, client, cwd, json }) => {
     const run = getOptionalStringFlag(flags, 'run')
     // Why: named runs remain inspectable without a pane; only implicit runs resolve identity.
-    const from = run
-      ? refuseConflictingSessionCaller(flags, 'from')
-      : await resolveCoordinatorTerminalHandle(flags, cwd, client)
+    const from = run ? undefined : await resolveCoordinatorTerminalHandle(flags, cwd, client)
     const result = await client.call<{
       gates: { id: string; task_id: string; question: string; status: string }[]
       count: number
diff --git a/src/cli/handlers/orchestration/task-handlers.ts b/src/cli/handlers/orchestration/task-handlers.ts
index 9533b1e5f8a..c4c943261e8 100644
--- a/src/cli/handlers/orchestration/task-handlers.ts
+++ b/src/cli/handlers/orchestration/task-handlers.ts
@@ -4,10 +4,7 @@ import { getOptionalStringFlag, getRequiredStringFlag } from '../../flags'
 import { RuntimeClientError } from '../../runtime-client'
 import { abbreviateOrchestrationTasks } from '../../../shared/orchestration-task-summary'
 import { callOrchestrationMutation } from './mutation-request'
-import {
-  refuseConflictingSessionCaller,
-  resolveCoordinatorTerminalHandle
-} from './terminal-identity'
+import { resolveCoordinatorTerminalHandle } from './terminal-identity'
 
 const TASK_STATUS_VALUES = [
   'pending',
@@ -42,7 +39,7 @@ export const ORCHESTRATION_TASK_HANDLERS: Record<string, CommandHandler> = {
     const brief = flags.has('brief')
     const run = getOptionalStringFlag(flags, 'run')
     const callerTerminalHandle = run
-      ? refuseConflictingSessionCaller(flags, 'from')
+      ? undefined
       : await resolveCoordinatorTerminalHandle(flags, cwd, client)
     const result = await client.call<{
       tasks: {
diff --git a/src/cli/handlers/orchestration/terminal-identity.ts b/src/cli/handlers/orchestration/terminal-identity.ts
index fce1696b036..572b9096bce 100644
--- a/src/cli/handlers/orchestration/terminal-identity.ts
+++ b/src/cli/handlers/orchestration/terminal-identity.ts
@@ -4,8 +4,7 @@ import { RuntimeClientError } from '../../runtime-client'
 import { getTerminalHandle } from '../../selectors'
 import { hasStructuredSessionMarker } from '../../../shared/structured-session-marker'
 import { readInjectedAgentSessionId } from '../../../shared/agent-session-caller-env'
-import { normalizeOrchestrationActor } from '../../../shared/orchestration-actor'
-import { isStructuredWorkerHandle } from '../../../shared/structured-worker-handle'
+import { injectedSessionAddress } from '../../session-caller-flags'
 
 /**
  * The caller's terminal handle, or `undefined` when an injected agent session id names the caller:
@@ -19,7 +18,8 @@ export async function resolveOrchestrationTerminalHandle(
   flagName: 'from' | 'terminal',
   options: { validateEnvHandle?: boolean } = {}
 ): Promise<string | undefined> {
-  if (resolveInjectedSessionCaller(flags, flagName)) {
+  // A caller flag naming anyone else was already refused at the CLI entry, from the command's spec.
+  if (readInjectedAgentSessionId()) {
     return undefined
   }
   const explicit = getOptionalStringFlag(flags, flagName)
@@ -168,61 +168,6 @@ function getClientErrorMessage(err: unknown): string | undefined {
   return typeof message === 'string' ? message : undefined
 }
 
-/**
- * The injected session id when this command runs as an agent session. The id wins over every other
- * identity this process carries; a caller flag may restate that same session but never name
- * another, and a conflicting one is refused here, before any request is sent.
- */
-function resolveInjectedSessionCaller(
-  flags: Map<string, string | boolean>,
-  flagName: 'from' | 'terminal'
-): string | undefined {
-  const sessionId = readInjectedAgentSessionId()
-  if (!sessionId) {
-    return undefined
-  }
-  const declared = getOptionalStringFlag(flags, flagName)
-  if (declared !== undefined && !namesInjectedSession(declared, sessionId)) {
-    throw new RuntimeClientError(
-      'consumer_fenced',
-      `This command runs as agent session ${sessionId}, so --${flagName} ${declared} would act as a ` +
-        `different caller. Drop --${flagName}: this session's orchestration commands already act as ` +
-        `session:${sessionId}. No request was sent.`
-    )
-  }
-  return sessionId
-}
-
-/**
- * For a listing scoped by `--run`, which needs no caller: a session still refuses a caller flag
- * naming someone else rather than dropping it.
- */
-export function refuseConflictingSessionCaller(
-  flags: Map<string, string | boolean>,
-  flagName: 'from' | 'terminal'
-): undefined {
-  resolveInjectedSessionCaller(flags, flagName)
-  return undefined
-}
-
-/** The session's own spellings, plus the handle a structured worker session was minted. */
-function namesInjectedSession(value: string, sessionId: string): boolean {
-  return normalizeOrchestrationActor(value)?.id === sessionId || value === injectedSessionAddress()
-}
-
-/**
- * The address the host gives this session: a structured worker keeps the handle it was minted, any
- * other session is `session:<id>`. Only for text that must match what the host writes.
- */
-export function injectedSessionAddress(): string | undefined {
-  const sessionId = readInjectedAgentSessionId()
-  if (!sessionId) {
-    return undefined
-  }
-  const ownHandle = process.env.ORCA_TERMINAL_HANDLE
-  return isStructuredWorkerHandle(ownHandle) ? ownHandle : `session:${sessionId}`
-}
-
 /** How check output names its caller: the handle, or the session's address. */
 export function orchestrationCallerLabel(handle: string | undefined): string {
   return handle ?? injectedSessionAddress() ?? 'unknown'
diff --git a/src/cli/index-orchestration.test.ts b/src/cli/index-orchestration.test.ts
index c4e4438f2e9..52fc7222e46 100644
--- a/src/cli/index-orchestration.test.ts
+++ b/src/cli/index-orchestration.test.ts
@@ -85,6 +85,25 @@ describe('orca cli worktree awareness', () => {
     expect(logSpy).toHaveBeenCalledWith('Sent 2 messages to 2 recipients')
   })
 
+  it("refuses an agent session's caller flag naming another actor before any request", async () => {
+    // One chokepoint for every verb: the spec says which flag names the caller.
+    process.env.ORCA_AGENT_SESSION_ID = 'f7a1c0de-1111-4222-8333-444455556666'
+    const logSpy = vi.spyOn(console, 'log').mockImplementation(() => {})
+    try {
+      await main(['orchestration', 'check', '--terminal', 'term_sibling', '--json'], '/tmp/repo')
+    } finally {
+      delete process.env.ORCA_AGENT_SESSION_ID
+    }
+
+    expect(callMock).not.toHaveBeenCalled()
+    expect(process.exitCode).toBe(1)
+    expect(JSON.parse(String(logSpy.mock.calls[0]?.[0]))).toMatchObject({
+      ok: false,
+      error: { code: 'consumer_fenced' }
+    })
+    process.exitCode = undefined
+  })
+
   it('rejects no-flag orchestration reset before calling the runtime', async () => {
     await main(['orchestration', 'reset'], '/tmp/repo')
 
diff --git a/src/cli/index.ts b/src/cli/index.ts
index f88d7ff2221..ede5fd9f9b4 100644
--- a/src/cli/index.ts
+++ b/src/cli/index.ts
@@ -21,6 +21,7 @@ import type { RuntimeClient } from './runtime-client'
 import { COMMAND_SPECS } from './specs'
 import { resolveOrchestrationCliExecutable } from './runtime/orchestration-recovery-command'
 import { runAsSessionCli } from './session-cli-reexec'
+import { refuseConflictingSessionCallerFlags } from './session-caller-flags'
 
 export { COMMAND_SPECS } from './specs'
 export { buildCurrentWorktreeSelector, normalizeWorktreeSelector } from './selectors'
@@ -111,6 +112,10 @@ export async function main(
     // lookup so users do not get misleading "Orca is not running" failures for
     // simple command typos or unsupported flags.
     validateCommandAndFlags(COMMAND_SPECS, parsed)
+    refuseConflictingSessionCallerFlags(
+      findCommandSpec(COMMAND_SPECS, parsed.commandPath),
+      parsed.flags
+    )
     const RuntimeClientClass = await loadRuntimeClientClass()
     const ignoreRemoteSelection = shouldIgnoreRemoteSelection(parsed.commandPath)
     const pairingCode = ignoreRemoteSelection ? null : parsed.flags.get('pairing-code')
diff --git a/src/cli/orchestration-session-caller-cli.test.ts b/src/cli/orchestration-session-caller-cli.test.ts
index 7118dcac4ab..9ca398e35b2 100644
--- a/src/cli/orchestration-session-caller-cli.test.ts
+++ b/src/cli/orchestration-session-caller-cli.test.ts
@@ -19,6 +19,9 @@ vi.mock('./format', () => ({ printResult: vi.fn() }))
 vi.mock('./selectors', () => ({ getTerminalHandle: getTerminalHandleMock }))
 
 import { ORCHESTRATION_HANDLERS } from './handlers/orchestration'
+import { findCommandSpec } from './args'
+import { COMMAND_SPECS } from './specs'
+import { refuseConflictingSessionCallerFlags } from './session-caller-flags'
 import { createOrchestrationCompatibilityEnvelope } from './runtime/orchestration-compatibility-envelope'
 import { formatCliError, reportCliError } from './cli-error'
 import { RuntimeRpcFailureError } from './runtime/types'
@@ -171,10 +174,27 @@ const CALLER_VERBS: Verb[] = [
   { command: 'worker-list', flags: {}, method: 'runCurrent', callerParam: 'from' }
 ]
 
+/** Enough flags for any verb to get past its own validation to identity resolution. */
+const EVERY_REQUIRED_FLAG = {
+  objective: 'o',
+  id: 'id_1',
+  task: 'task_1',
+  spec: 's',
+  question: 'q',
+  resolution: 'r',
+  subject: 's',
+  body: 'b',
+  to: 'term_worker',
+  status: 'completed',
+  preamble: true,
+  request: 'req_1'
+} as const
+
 function flagMap(flags: Record<string, string | true>): Map<string, string | boolean> {
   return new Map(Object.entries(flags))
 }
 
+/** What `main()` does between parsing and dispatch: the spec-driven caller check, then the handler. */
 async function invoke(
   command: string,
   flags: Map<string, string | boolean>,
@@ -184,6 +204,10 @@ async function invoke(
   if (!handler) {
     throw new Error(`no handler for ${command}`)
   }
+  refuseConflictingSessionCallerFlags(
+    findCommandSpec(COMMAND_SPECS, ['orchestration', command]),
+    flags
+  )
   await handler({
     flags,
     // oxlint-disable-next-line typescript/consistent-type-assertions -- SAFETY: these handlers read only `call`; RuntimeClient is a class, so a structural double cannot satisfy it without the cast.
@@ -488,23 +512,62 @@ describe('the orchestration envelope', () => {
   })
 })
 
-describe('every orchestration verb, enumerated', () => {
-  /** Enough flags for any verb to get past its own validation to identity resolution. */
-  const EVERY_REQUIRED_FLAG = {
-    objective: 'o',
-    id: 'id_1',
-    task: 'task_1',
-    spec: 's',
-    question: 'q',
-    resolution: 'r',
-    subject: 's',
-    body: 'b',
-    to: 'term_worker',
-    status: 'completed',
-    preamble: true,
-    request: 'req_1'
-  } as const
+describe('which flag names the caller, declared on every spec', () => {
+  const ORCHESTRATION_SPECS = COMMAND_SPECS.filter((spec) => spec.path[0] === 'orchestration')
 
+  it('classifies every --from and --terminal an orchestration verb accepts', () => {
+    // A new verb cannot take either flag without saying whether it names the caller, so the entry
+    // check covers it by construction instead of each handler remembering to refuse.
+    const unclassified = ORCHESTRATION_SPECS.flatMap((spec) =>
+      (['from', 'terminal'] as const)
+        .filter((flag) => spec.allowedFlags.includes(flag) && !spec.identityFlagRoles?.[flag])
+        .map((flag) => `${spec.path.join(' ')} --${flag}`)
+    )
+    expect(unclassified).toEqual([])
+  })
+
+  const callerFlagVerbs = ORCHESTRATION_SPECS.flatMap((spec) =>
+    (['from', 'terminal'] as const)
+      .filter((flag) => spec.identityFlagRoles?.[flag] === 'caller')
+      .map((flag) => ({ command: spec.path[1] ?? '', flag }))
+  )
+
+  it('covers the verbs whose requests name a caller', () => {
+    expect(callerFlagVerbs.length).toBeGreaterThanOrEqual(CALLER_VERBS.length)
+  })
+
+  it.each(callerFlagVerbs)(
+    '$command refuses --$flag naming another actor, before any request',
+    async ({ command, flag }) => {
+      asSessionInTerminalView()
+      await expect(
+        invoke(command, flagMap({ ...EVERY_REQUIRED_FLAG, [flag]: 'term_sibling' }))
+      ).rejects.toMatchObject({ code: 'consumer_fenced' })
+      expect(callMock).not.toHaveBeenCalled()
+      expect(getTerminalHandleMock).not.toHaveBeenCalled()
+    }
+  )
+
+  it.each(
+    ORCHESTRATION_SPECS.flatMap((spec) =>
+      (['from', 'terminal'] as const)
+        .filter((flag) => spec.identityFlagRoles?.[flag] === 'target')
+        .map((flag) => ({ command: spec.path[1] ?? '', flag }))
+    )
+  )('$command passes a --$flag target through unfenced', async ({ command, flag }) => {
+    asSessionInTerminalView()
+    await invoke(command, flagMap({ ...EVERY_REQUIRED_FLAG, [flag]: 'term_sibling' })).catch(
+      (error: unknown) => {
+        expect(error).not.toMatchObject({ code: 'consumer_fenced' })
+      }
+    )
+    expect(callMock.mock.calls.flatMap(([, params]) => Object.values(params ?? {}))).toContain(
+      'term_sibling'
+    )
+  })
+})
+
+describe('every orchestration verb, enumerated', () => {
   /** Runs every verb once; returns the ones that guessed an implicit terminal. */
   async function verbsThatGuess(): Promise<string[]> {
     const guessed: string[] = []
diff --git a/src/cli/session-caller-flags.ts b/src/cli/session-caller-flags.ts
new file mode 100644
index 00000000000..b136bccb4bc
--- /dev/null
+++ b/src/cli/session-caller-flags.ts
@@ -0,0 +1,63 @@
+/**
+ * An agent session is its own orchestration caller. A flag that names the caller may restate that
+ * session, but one naming anyone else is refused before any handler runs — never dropped, never
+ * allowed to win. Against a host that predates session callers this is the only guard: such a host
+ * would honor the flag as the caller, which is how a chat consumed a sibling's mail (#21097).
+ *
+ * Whether `--from`/`--terminal` names the caller or a target is declared on the command's spec
+ * (`identityFlagRoles`) and checked once, here, at the CLI entry, so a handler cannot forget it.
+ */
+
+import type { CommandSpec, IdentityFlag } from './command-spec'
+import { RuntimeClientError } from './runtime/types'
+import { readInjectedAgentSessionId } from '../shared/agent-session-caller-env'
+import { normalizeOrchestrationActor } from '../shared/orchestration-actor'
+import { isStructuredWorkerHandle } from '../shared/structured-worker-handle'
+
+export function refuseConflictingSessionCallerFlags(
+  spec: CommandSpec | undefined,
+  flags: ReadonlyMap<string, string | boolean>,
+  env: NodeJS.ProcessEnv = process.env
+): void {
+  const sessionId = readInjectedAgentSessionId(env)
+  if (!sessionId || !spec?.identityFlagRoles) {
+    return
+  }
+  for (const flagName of IDENTITY_FLAGS) {
+    const declared = flags.get(flagName)
+    if (
+      spec.identityFlagRoles[flagName] === 'caller' &&
+      typeof declared === 'string' &&
+      !namesInjectedSession(declared, sessionId, env)
+    ) {
+      throw new RuntimeClientError(
+        'consumer_fenced',
+        `This command runs as agent session ${sessionId}, so --${flagName} ${declared} would act as a ` +
+          `different caller. Drop --${flagName}: this session's orchestration commands already act as ` +
+          `session:${sessionId}. No request was sent.`
+      )
+    }
+  }
+}
+
+const IDENTITY_FLAGS: readonly IdentityFlag[] = ['from', 'terminal']
+
+/** The session's own spellings, plus the handle a structured worker session was minted. */
+function namesInjectedSession(value: string, sessionId: string, env: NodeJS.ProcessEnv): boolean {
+  return (
+    normalizeOrchestrationActor(value)?.id === sessionId || value === injectedSessionAddress(env)
+  )
+}
+
+/**
+ * The address the host gives this session: a structured worker keeps the handle it was minted, any
+ * other session is `session:<id>`. Only for text that must match what the host writes.
+ */
+export function injectedSessionAddress(env: NodeJS.ProcessEnv = process.env): string | undefined {
+  const sessionId = readInjectedAgentSessionId(env)
+  if (!sessionId) {
+    return undefined
+  }
+  const ownHandle = env.ORCA_TERMINAL_HANDLE
+  return isStructuredWorkerHandle(ownHandle) ? ownHandle : `session:${sessionId}`
+}
diff --git a/src/cli/specs/orchestration-worker-specs.ts b/src/cli/specs/orchestration-worker-specs.ts
index 1448667e54a..04423ffc6fb 100644
--- a/src/cli/specs/orchestration-worker-specs.ts
+++ b/src/cli/specs/orchestration-worker-specs.ts
@@ -31,6 +31,7 @@ export const ORCHESTRATION_WORKER_COMMAND_SPECS: CommandSpec[] = [
       'from',
       'retry-request'
     ],
+    identityFlagRoles: { from: 'caller', terminal: 'target' },
     notes: [
       'Current and existing worktrees never rerun setup; a fresh agent terminal is created unless --terminal is explicit.',
       'When reusing --terminal, pass --worktree for that terminal; current means the coordinator worktree.',
diff --git a/src/cli/specs/orchestration.ts b/src/cli/specs/orchestration.ts
index 458afa2e525..8c4418f38ba 100644
--- a/src/cli/specs/orchestration.ts
+++ b/src/cli/specs/orchestration.ts
@@ -9,6 +9,7 @@ export const ORCHESTRATION_COMMAND_SPECS: CommandSpec[] = [
     usage:
       'orca orchestration run-create --objective <text> [--from <handle>] [--retry-request <id>] [--json]',
     allowedFlags: [...GLOBAL_FLAGS, 'objective', 'from', 'retry-request'],
+    identityFlagRoles: { from: 'caller' },
     notes: [
       'A Run is a namespace and home inbox. It never schedules or places workers.',
       '--retry-request is only for exact recovery after an unknown mutation result.'
@@ -20,6 +21,7 @@ export const ORCHESTRATION_COMMAND_SPECS: CommandSpec[] = [
     usage:
       'orca orchestration run-use --id <run_id> [--from <handle>] [--takeover-legacy] [--retry-request <id>] [--json]',
     allowedFlags: [...GLOBAL_FLAGS, 'id', 'from', 'takeover-legacy', 'retry-request'],
+    identityFlagRoles: { from: 'caller' },
     notes: [
       '--takeover-legacy must run in the live coordinator agent terminal it binds; it preserves existing worker assignments.'
     ]
@@ -28,7 +30,8 @@ export const ORCHESTRATION_COMMAND_SPECS: CommandSpec[] = [
     path: ['orchestration', 'run-current'],
     summary: 'Show the Run bound to this coordinator terminal',
     usage: 'orca orchestration run-current [--from <handle>] [--json]',
-    allowedFlags: [...GLOBAL_FLAGS, 'from']
+    allowedFlags: [...GLOBAL_FLAGS, 'from'],
+    identityFlagRoles: { from: 'caller' }
   },
   {
     path: ['orchestration', 'run-list'],
@@ -67,6 +70,7 @@ export const ORCHESTRATION_COMMAND_SPECS: CommandSpec[] = [
       'report-path',
       'phase'
     ],
+    identityFlagRoles: { from: 'caller' },
     notes: [
       'Valid --type values: status, dispatch, worker_done, merge_ready, escalation, handoff, decision_gate, question, heartbeat.',
       'To answer a worker question, use orchestration reply --id <msg_id> --body <text> with the same Orca CLI executable.',
@@ -109,6 +113,7 @@ export const ORCHESTRATION_COMMAND_SPECS: CommandSpec[] = [
       'timeout-ms',
       'retry-request'
     ],
+    identityFlagRoles: { terminal: 'caller' },
     notes: [
       'On Windows PowerShell, quote comma-separated type filters, e.g. --types "worker_done,escalation".',
       '--types is the wake condition for --wait; a returned Delivery is always the whole FIFO batch, so it is never filtered by type. Without --wait it has no effect on consuming checks. Only --peek and --all filter their rows.',
@@ -121,13 +126,15 @@ export const ORCHESTRATION_COMMAND_SPECS: CommandSpec[] = [
     summary: 'Reply to a message',
     usage:
       'orca orchestration reply --id <msg_id> --body <text> [--run <run_id>] [--from <handle>] [--retry-request <id>] [--json]',
-    allowedFlags: [...GLOBAL_FLAGS, 'id', 'body', 'run', 'from', 'retry-request']
+    allowedFlags: [...GLOBAL_FLAGS, 'id', 'body', 'run', 'from', 'retry-request'],
+    identityFlagRoles: { from: 'caller' }
   },
   {
     path: ['orchestration', 'inbox'],
     summary: 'Show messages across (or for) recipients',
     usage: 'orca orchestration inbox [--limit <n>] [--terminal <handle>] [--full] [--json]',
-    allowedFlags: [...GLOBAL_FLAGS, 'limit', 'terminal', 'full']
+    allowedFlags: [...GLOBAL_FLAGS, 'limit', 'terminal', 'full'],
+    identityFlagRoles: { terminal: 'target' }
   },
   {
     path: ['orchestration', 'task-create'],
@@ -144,7 +151,8 @@ export const ORCHESTRATION_COMMAND_SPECS: CommandSpec[] = [
       'run',
       'from',
       'retry-request'
-    ]
+    ],
+    identityFlagRoles: { from: 'caller' }
   },
   {
     path: ['orchestration', 'task-list'],
@@ -152,6 +160,7 @@ export const ORCHESTRATION_COMMAND_SPECS: CommandSpec[] = [
     usage:
       'orca orchestration task-list [--status <status>] [--ready] [--brief] [--run <run_id>] [--from <handle>] [--json]',
     allowedFlags: [...GLOBAL_FLAGS, 'status', 'ready', 'brief', 'run', 'from'],
+    identityFlagRoles: { from: 'caller' },
     notes: ['--brief collapses whitespace and caps each spec at 160 characters.']
   },
   {
@@ -160,6 +169,7 @@ export const ORCHESTRATION_COMMAND_SPECS: CommandSpec[] = [
     usage:
       'orca orchestration task-update --id <task_id> --status <status> [--result <json>] [--run <run_id>] [--from <handle>] [--retry-request <id>] [--json]',
     allowedFlags: [...GLOBAL_FLAGS, 'id', 'status', 'result', 'run', 'from', 'retry-request'],
+    identityFlagRoles: { from: 'caller' },
     notes: ['Valid --status values: pending, ready, dispatched, completed, failed, blocked.']
   },
   ...ORCHESTRATION_WORKER_COMMAND_SPECS,
@@ -178,7 +188,8 @@ export const ORCHESTRATION_COMMAND_SPECS: CommandSpec[] = [
       'dry-run',
       'return-preamble',
       'retry-request'
-    ]
+    ],
+    identityFlagRoles: { from: 'caller' }
   },
   {
     path: ['orchestration', 'request-show'],
@@ -196,7 +207,8 @@ export const ORCHESTRATION_COMMAND_SPECS: CommandSpec[] = [
     summary: 'Show dispatch context for a task',
     usage:
       'orca orchestration dispatch-show --task <task_id> [--preamble] [--from <handle>] [--json]',
-    allowedFlags: [...GLOBAL_FLAGS, 'task', 'preamble', 'from']
+    allowedFlags: [...GLOBAL_FLAGS, 'task', 'preamble', 'from'],
+    identityFlagRoles: { from: 'target' }
   },
   {
     path: ['orchestration', 'ask'],
@@ -215,6 +227,7 @@ export const ORCHESTRATION_COMMAND_SPECS: CommandSpec[] = [
       'from',
       'retry-request'
     ],
+    identityFlagRoles: { from: 'caller' },
     notes: [
       'From an active Dispatch, a new question defaults to its owning Run mailbox.',
       'Timeout leaves the question pending; resume with the original message ID.'
@@ -234,6 +247,7 @@ export const ORCHESTRATION_COMMAND_SPECS: CommandSpec[] = [
       'max-concurrent',
       'worktree'
     ],
+    identityFlagRoles: { from: 'caller' },
     notes: [
       'This command performs no effects and returns the exact `skills get orchestration --full` recovery action.',
       'Use the lightweight Run, Task, and worker-start primitives described by the current skill.'
@@ -254,14 +268,16 @@ export const ORCHESTRATION_COMMAND_SPECS: CommandSpec[] = [
     summary: 'Create a decision gate blocking a task',
     usage:
       'orca orchestration gate-create --task <task_id> --question <text> [--options <json_array>] [--from <handle>] [--retry-request <id>] [--json]',
-    allowedFlags: [...GLOBAL_FLAGS, 'task', 'question', 'options', 'from', 'retry-request']
+    allowedFlags: [...GLOBAL_FLAGS, 'task', 'question', 'options', 'from', 'retry-request'],
+    identityFlagRoles: { from: 'caller' }
   },
   {
     path: ['orchestration', 'gate-resolve'],
     summary: 'Resolve a pending decision gate',
     usage:
       'orca orchestration gate-resolve --id <gate_id> --resolution <text> [--from <handle>] [--retry-request <id>] [--json]',
-    allowedFlags: [...GLOBAL_FLAGS, 'id', 'resolution', 'from', 'retry-request']
+    allowedFlags: [...GLOBAL_FLAGS, 'id', 'resolution', 'from', 'retry-request'],
+    identityFlagRoles: { from: 'caller' }
   },
   {
     path: ['orchestration', 'gate-list'],
@@ -269,6 +285,7 @@ export const ORCHESTRATION_COMMAND_SPECS: CommandSpec[] = [
     usage:
       'orca orchestration gate-list [--task <task_id>] [--status <status>] [--run <run_id>] [--from <handle>] [--json]',
     allowedFlags: [...GLOBAL_FLAGS, 'task', 'status', 'run', 'from'],
+    identityFlagRoles: { from: 'caller' },
     notes: ['--run inspects a named Run without binding; otherwise gates are scoped to the caller.']
   },
   {