diff --git a/src/config/schema.ts b/src/config/schema.ts
index ee15fec..325902e 100644
--- a/src/config/schema.ts
+++ b/src/config/schema.ts
@@ -143,6 +143,12 @@ const reportingSchema = z.object({
   requestTimeoutMs: z.number().int().min(100).max(60_000).default(15_000),
 }).default({})
 
+const hooksSchema = z.object({
+  onTicketDispatch: z.object({
+    relayChannel: z.string().trim().min(1),
+  }).optional(),
+}).optional()
+
 const previewServiceSchema = z.object({
   /** Local HTTP port the repository's development server listens on. */
   port: z.number().int().min(1).max(65_535),
@@ -283,6 +289,7 @@ const WorkspaceConfigObjectSchema = z.object({
   // analytics. It defaults on for real CLI sessions and remains no-op when no
   // Cloud account is available; delivery failure never changes orchestration.
   reporting: reportingSchema,
+  hooks: hooksSchema,
   preview: previewSchema,
   github: githubSchema,
   verification: verificationSchema,
diff --git a/src/orchestrator/factory.test.ts b/src/orchestrator/factory.test.ts
index 3bb9a36..80176a6 100644
--- a/src/orchestrator/factory.test.ts
+++ b/src/orchestrator/factory.test.ts
@@ -9623,6 +9623,44 @@ describe('FactoryLoop', () => {
     expect(new Set(fleet.spawns.map((spawn) => spawn.invocationId)).size).toBe(2)
   })
 
+  it('posts the configured onTicketDispatch relay hook with issue and session metadata', async () => {
+    const path = issuePath(124)
+    const mount = new FakeMountClient({ [path]: realIssueFile(124) })
+    const fleet = new FakeFleetClient()
+    fleet.setSessionRef('ar-124-impl-pear', 'session-ar-124-impl-pear')
+    const timestamp = '2026-08-13T08:13:00.000Z'
+    const factory = createFactory(config({
+      hooks: { onTicketDispatch: { relayChannel: 'dispatch-notifications' } },
+    }), {
+      mount,
+      fleet,
+      triage: new StaticTriage(),
+      clock: { now: () => Date.parse(timestamp), sleep: async () => {} },
+    })
+    const decision = await factory.triageIssue(parseLinearIssue(path, realIssueFile(124)))
+    decision.implementers[0]!.principal = 'broker'
+
+    await factory.dispatch(decision)
+
+    const message = fleet.messages.find((candidate) => candidate.to === '#dispatch-notifications')
+    expect(message).toBeDefined()
+    expect(JSON.parse(message!.text)).toEqual({
+      eventType: 'ticket.dispatched',
+      issue: {
+        id: 'uuid-124',
+        title: '[factory-e2e] Fix factory issue 124',
+        url: 'https://linear.app/agent-relay/issue/AR-124/factory-issue-124',
+      },
+      agent: {
+        name: 'ar-124-impl-pear',
+        sessionRef: 'session-ar-124-impl-pear',
+      },
+      sessionOwner: 'broker',
+      timestamp,
+    })
+    expect(factory.status().counters.ticketDispatchHookNotifications).toBe(1)
+  })
+
   it('derives implementer dispatch identities from repo labels instead of triage implementers', async () => {
     const routedIssue = realIssueFile(720, ready, {
       title: '[factory-e2e] Relayfile webhooks to cloud',
diff --git a/src/orchestrator/factory.ts b/src/orchestrator/factory.ts
index 2b8b4cb..abb2875 100644
--- a/src/orchestrator/factory.ts
+++ b/src/orchestrator/factory.ts
@@ -116,6 +116,13 @@ import { boundedRunCostTotal, CostLedger, type RunCostTotal, type UnpricedModelC
 
 type FactoryEvent = 'issue-queued' | 'dispatched' | 'issue-done' | 'writeback-verified' | 'error'
 type Listener = (payload: FactoryEventPayload) => void
+type TicketDispatchRelayPayload = {
+  eventType: 'ticket.dispatched'
+  issue: { id: string; title: string; url: string }
+  agent: { name: string; sessionRef?: string }
+  sessionOwner: string | null
+  timestamp: string
+}
 type SlackThreadWatcher = { stop(): Promise<void> }
 type GithubIssueCommentWatcher = { stop(): Promise<void> }
 type TerminationRoots = { pids: number[]; status: AgentPidResolution['status'] }
@@ -2726,6 +2733,9 @@ export class FactoryLoop implements Factory {
       await this.#saveDispatchLifecycle(record, 'running')
       this.#increment('dispatched')
       this.#emit('dispatched', { issue: dispatchDecision.issue, result })
+      if (this.#config.hooks?.onTicketDispatch && !dryRun) {
+        await this.#notifyTicketDispatch(decision, liveIssue, record, result)
+      }
       if (!dryRun) {
         await this.#ensureSlackDispatchThread(record, result)
       }
@@ -11098,6 +11108,52 @@ export class FactoryLoop implements Factory {
     }
   }
 
+  async #notifyTicketDispatch(
+    decision: TriageDecision,
+    issue: LinearIssue,
+    record: InFlightIssue,
+    result: DispatchResult,
+  ): Promise<void> {
+    const hook = this.#config.hooks?.onTicketDispatch
+    if (!hook || result.dryRun) return
+
+    const agent = result.agents.find((candidate) => candidate.role === 'implementer')
+      ?? result.agents.find((candidate) => candidate.role === 'workflow')
+      ?? result.agents[0]
+    if (!agent) return
+
+    const tracked = record.agents.get(agent.name)
+    const payload: TicketDispatchRelayPayload = {
+      eventType: 'ticket.dispatched',
+      issue: {
+        id: issue.uuid,
+        title: issue.title,
+        url: dispatchIssueUrl(issue),
+      },
+      agent: {
+        name: agent.name,
+        ...(tracked?.sessionRef ? { sessionRef: tracked.sessionRef } : {}),
+      },
+      sessionOwner: dispatchSessionOwner(decision) ?? null,
+      timestamp: new Date(this.#clock.now()).toISOString(),
+    }
+
+    try {
+      await this.#fleet.sendMessage({
+        to: `#${hook.relayChannel.replace(/^#/u, '')}`,
+        text: JSON.stringify(payload),
+      })
+      this.#increment('ticketDispatchHookNotifications')
+    } catch (error) {
+      this.#increment('ticketDispatchHookFailures')
+      this.#logger.warn?.('[factory] onTicketDispatch relay hook failed', {
+        issue: issue.key,
+        channel: hook.relayChannel,
+        error: describeError(error).errorMessage,
+      })
+    }
+  }
+
   #error(error: unknown, issue?: IssueRef): void {
     this.#increment('errors')
     const details = describeError(error)
@@ -13620,6 +13676,23 @@ function dispatchSpecs(decision: TriageDecision): AgentSpec[] {
   return [...decision.implementers, decision.reviewer]
 }
 
+function dispatchSessionOwner(decision: TriageDecision): string | undefined {
+  for (const spec of dispatchSpecs(decision)) {
+    const sessionOwner = spec.principal?.trim() || spec.owner?.trim()
+    if (sessionOwner) return sessionOwner
+  }
+  return undefined
+}
+
+function dispatchIssueUrl(issue: LinearIssue): string {
+  const payload = wrappedPayload(issue.raw)
+  const source = asRecord(payload.source)
+  return stringValue(payload.url)
+    ?? stringValue(payload.html_url)
+    ?? stringValue(source?.url)
+    ?? issue.path
+}
+
 function previewServiceForRepo(
   config: FactoryConfig,
   repo: string,
diff --git a/src/ports/fleet.ts b/src/ports/fleet.ts
index 4b736bd..f9d98bc 100644
--- a/src/ports/fleet.ts
+++ b/src/ports/fleet.ts
@@ -185,6 +185,10 @@ export interface FleetClient {
 export type AgentSpec = {
   name: string
   role: 'implementer' | 'reviewer' | 'babysitter' | 'workflow'
+  /** Principal that initiated the agent session, when supplied by the dispatcher. */
+  principal?: string
+  /** Compatibility alias for dispatchers that identify the initiating principal as an owner. */
+  owner?: string
   capability: Capability
   model?: string
   task: string
@@ -197,6 +201,10 @@ export type AgentSpec = {
   channel?: string
   node?: 'self' | string
   sessionRef?: string
+  /** Canonical Relayhistory session that this agent should continue. */
+  resumeSessionId?: string
+  /** CLI that originated the Relayhistory session, when known. */
+  originCli?: 'claude' | 'codex'
   invocationId?: string
   restartPolicy?: RestartPolicy
   /** Durable, exact PR ownership for a lazily-spawned babysitter. */
diff --git a/src/triage/schema.ts b/src/triage/schema.ts
index 887aaca..7fea252 100644
--- a/src/triage/schema.ts
+++ b/src/triage/schema.ts
@@ -13,6 +13,8 @@ export const AgentSpecSchema = z.object({
   channel: z.string().optional(),
   node: z.string().optional(),
   sessionRef: z.string().optional(),
+  resumeSessionId: z.string().optional(),
+  originCli: z.enum(['claude', 'codex']).optional(),
   invocationId: z.string().optional(),
   restartPolicy: z.unknown().optional(),
 })