diff --git a/src/pm/webhook-handler.ts b/src/pm/webhook-handler.ts
index 540fb7cb..8548002c 100644
--- a/src/pm/webhook-handler.ts
+++ b/src/pm/webhook-handler.ts
@@ -113,11 +113,16 @@ async function handleMatchedTrigger(
 	// Agent-type concurrency limit
 	let agentTypeMaxConcurrency: number | null = null;
 	if (result.agentType) {
-		const concurrencyCheck = await checkAgentTypeConcurrency(project.id, result.agentType);
+		const concurrencyCheck = await checkAgentTypeConcurrency(
+			project.id,
+			result.agentType,
+			undefined,
+			result.workItemId,
+		);
 		agentTypeMaxConcurrency = concurrencyCheck.maxConcurrency;
 		if (concurrencyCheck.blocked) return;
 		if (agentTypeMaxConcurrency !== null) {
-			markRecentlyDispatched(project.id, result.agentType);
+			markRecentlyDispatched(project.id, result.agentType, result.workItemId);
 			markAgentTypeEnqueued(project.id, result.agentType);
 		}
 	}
diff --git a/src/router/agent-type-lock.ts b/src/router/agent-type-lock.ts
index e2dd01c8..2320fff5 100644
--- a/src/router/agent-type-lock.ts
+++ b/src/router/agent-type-lock.ts
@@ -32,6 +32,11 @@ function makeKey(projectId: string, agentType: string): string {
 	return `${projectId}:${agentType}`;
 }
 
+function makeDedupKey(projectId: string, agentType: string, dedupScope?: string): string {
+	const baseKey = makeKey(projectId, agentType);
+	return dedupScope ? `${baseKey}:${dedupScope}` : baseKey;
+}
+
 /**
  * Check whether an agent type is at its concurrency limit for a project.
  * Fast path: in-memory map. Fallback: DB count of running agent_runs.
@@ -125,11 +130,15 @@ const DEDUP_TTL_MS = 60 * 1000; // 60 seconds
 const dedupMap = new Map<string, number>();
 
 /**
- * Check whether an agent type was recently dispatched for a project.
+ * Check whether an agent type was recently dispatched for a project/scope.
  * Returns true if a dispatch happened within the dedup TTL window.
  */
-export function wasRecentlyDispatched(projectId: string, agentType: string): boolean {
-	const key = makeKey(projectId, agentType);
+export function wasRecentlyDispatched(
+	projectId: string,
+	agentType: string,
+	dedupScope?: string,
+): boolean {
+	const key = makeDedupKey(projectId, agentType, dedupScope);
 	const timestamp = dedupMap.get(key);
 	if (timestamp === undefined) return false;
 
@@ -141,11 +150,15 @@ export function wasRecentlyDispatched(projectId: string, agentType: string): boo
 }
 
 /**
- * Mark an agent type as recently dispatched for a project.
+ * Mark an agent type as recently dispatched for a project/scope.
  * The mark expires after DEDUP_TTL_MS and is NOT cleared on completion.
  */
-export function markRecentlyDispatched(projectId: string, agentType: string): void {
-	const key = makeKey(projectId, agentType);
+export function markRecentlyDispatched(
+	projectId: string,
+	agentType: string,
+	dedupScope?: string,
+): void {
+	const key = makeDedupKey(projectId, agentType, dedupScope);
 	dedupMap.set(key, Date.now());
 
 	// Periodic cleanup: evict expired entries when map grows large
@@ -173,6 +186,7 @@ export async function checkAgentTypeConcurrency(
 	projectId: string,
 	agentType: string,
 	logLabel?: string,
+	dedupScope?: string,
 ): Promise<{ maxConcurrency: number | null; blocked: boolean }> {
 	let maxConcurrency: number | null;
 	try {
@@ -187,10 +201,11 @@ export async function checkAgentTypeConcurrency(
 	}
 	if (maxConcurrency === null) return { maxConcurrency: null, blocked: false };
 
-	if (wasRecentlyDispatched(projectId, agentType)) {
+	if (wasRecentlyDispatched(projectId, agentType, dedupScope)) {
 		logger.info(`${logLabel ?? 'Agent'} recently dispatched, skipping (dedup)`, {
 			projectId,
 			agentType,
+			dedupScope,
 		});
 		return { maxConcurrency, blocked: true };
 	}
diff --git a/src/router/webhook-processor.ts b/src/router/webhook-processor.ts
index 45860cd1..9caa69fb 100644
--- a/src/router/webhook-processor.ts
+++ b/src/router/webhook-processor.ts
@@ -173,6 +173,7 @@ export async function processRouterWebhook(
 			project.id,
 			result.agentType,
 			adapter.type,
+			result.workItemId,
 		);
 		agentTypeMaxConcurrency = concurrencyCheck.maxConcurrency;
 		if (concurrencyCheck.blocked) {
@@ -216,7 +217,7 @@ export async function processRouterWebhook(
 			markWorkItemEnqueued(project.id, result.workItemId, result.agentType);
 		}
 		if (result.agentType && agentTypeMaxConcurrency !== null) {
-			markRecentlyDispatched(project.id, result.agentType);
+			markRecentlyDispatched(project.id, result.agentType, result.workItemId);
 			markAgentTypeEnqueued(project.id, result.agentType);
 		}
 		logger.info(`${adapter.type} job queued`, {
diff --git a/tests/unit/router/agent-type-lock.test.ts b/tests/unit/router/agent-type-lock.test.ts
index fe5c4375..c296c091 100644
--- a/tests/unit/router/agent-type-lock.test.ts
+++ b/tests/unit/router/agent-type-lock.test.ts
@@ -187,6 +187,13 @@ describe('agent-type-lock', () => {
 			expect(wasRecentlyDispatched('proj1', 'backlog-manager')).toBe(true);
 			expect(wasRecentlyDispatched('proj1', 'implementation')).toBe(false);
 		});
+
+		it('different dedup scopes are independent', () => {
+			markRecentlyDispatched('proj1', 'planning', 'TF-8');
+			expect(wasRecentlyDispatched('proj1', 'planning', 'TF-8')).toBe(true);
+			expect(wasRecentlyDispatched('proj1', 'planning', 'TF-10')).toBe(false);
+			expect(wasRecentlyDispatched('proj1', 'planning')).toBe(false);
+		});
 	});
 
 	// ========================================================================
@@ -208,6 +215,24 @@ describe('agent-type-lock', () => {
 			expect(result.maxConcurrency).toBe(1);
 		});
 
+		it('does not block a different work item in the dedup window', async () => {
+			vi.mocked(getMaxConcurrency).mockResolvedValueOnce(5);
+			markRecentlyDispatched('proj1', 'planning', 'TF-8');
+
+			const result = await checkAgentTypeConcurrency('proj1', 'planning', 'linear', 'TF-10');
+
+			expect(result).toEqual({ maxConcurrency: 5, blocked: false });
+		});
+
+		it('blocks the same work item in the dedup window', async () => {
+			vi.mocked(getMaxConcurrency).mockResolvedValueOnce(5);
+			markRecentlyDispatched('proj1', 'planning', 'TF-8');
+
+			const result = await checkAgentTypeConcurrency('proj1', 'planning', 'linear', 'TF-8');
+
+			expect(result).toEqual({ maxConcurrency: 5, blocked: true });
+		});
+
 		it('returns blocked: true when agent type is locked', async () => {
 			vi.mocked(getMaxConcurrency).mockResolvedValueOnce(1);
 			markAgentTypeEnqueued('proj1', 'implementation');