diff --git a/packages/coding-agent/CHANGELOG.md b/packages/coding-agent/CHANGELOG.md
index 1a997916d..dc459d21f 100644
--- a/packages/coding-agent/CHANGELOG.md
+++ b/packages/coding-agent/CHANGELOG.md
@@ -12,6 +12,7 @@
 - Fixed manual `/compact` leaving `session.isCompacting` false while active-turn abort teardown awaited, so the first steer/follow-up typed during compaction startup now routes through the compaction queue instead of being lost. ([#3485](https://github.com/can1357/oh-my-pi/issues/3485))
 - Fixed ollama-cloud task/subagent fan-out exceeding the provider's three-request concurrency cap by adding a provider-specific subagent limiter, and let configured task/smol/advisor model roles inherit the default retry fallback chain when they do not define their own chain. ([#3464](https://github.com/can1357/oh-my-pi/issues/3464))
 - Fixed the per-provider subagent concurrency limiter (e.g. `providers.ollama-cloud.maxConcurrency`) being replaced with a fresh semaphore whenever the configured limit changed, which orphaned the in-flight slots on the old instance and let a runtime or mixed limit value exceed the cap. The limiter now resizes a single shared semaphore in place — raising the ceiling admits queued waiters immediately, lowering it drains in-flight holders without admitting past the new cap. ([#3464](https://github.com/can1357/oh-my-pi/issues/3464))
+- Fixed a background-task spawn slot leaking from the `task.maxConcurrency` limiter when progress reporting threw between acquiring the slot and entering the guarded run: `markRunning`/`reportProgress` now run inside the try whose `finally` releases the semaphore, so a failed progress report can no longer permanently shrink subagent concurrency. ([#3464](https://github.com/can1357/oh-my-pi/issues/3464))
 
 ## [16.1.19] - 2026-06-25
 
diff --git a/packages/coding-agent/src/task/index.ts b/packages/coding-agent/src/task/index.ts
index d48091a1a..3287351ec 100644
--- a/packages/coding-agent/src/task/index.ts
+++ b/packages/coding-agent/src/task/index.ts
@@ -798,13 +798,13 @@ export class TaskTool implements AgentTool<TaskToolSchemaInstance, TaskToolDetai
 					onSettled?.(true);
 					throw new Error("Aborted before execution");
 				}
-				markRunning();
-				progress.status = "running";
-				await reportProgress(
-					`Running background task ${agentId}...`,
-					buildDetails("running", ownJobId) as unknown as Record<string, unknown>,
-				);
 				try {
+					markRunning();
+					progress.status = "running";
+					await reportProgress(
+						`Running background task ${agentId}...`,
+						buildDetails("running", ownJobId) as unknown as Record<string, unknown>,
+					);
 					const result = await this.#executeSync(
 						toolCallId,
 						spawnParams,