# "Task" tool missing. Prevents sub-agent launch **URL:** \ **Category:** Bug Reports\ **Tags:** subagents, anthropic\ **Created:** [March 25, 2026, 1:59am UTC](https://forum.cursor.com/t/task-tool-missing-prevents-sub-agent-launch/155817 "2026-03-25T01:59:42Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![cv\_intime](https://avatars.discourse-cdn.com/v4/letter/c/d07c76/32.png) [@cv\_intime](https://forum.cursor.com/u/cv_intime)\ **Post date:** [March 25, 2026, 1:59am UTC](https://forum.cursor.com/t/task-tool-missing-prevents-sub-agent-launch/155817/1 "2026-03-25T01:59:42Z")
### Describe the Bug @Colin @deanrie Until the last 1 hour or so, I have been able to ask Claude Opus 4.6 High Thinking to launch sub-agents (I have many). Now I am getting an error from the agent indicating it does not have the “Task” tool available, which is required for launching sub-agents. It seems like the internal prompt is just not getting the correct tool list. Since Claude Opus is one of the few models that can actually use sub-agents, it is absolutely critical that this is working. ### Steps to Reproduce - open a new tab - choose the claude-4.6-opus-high-thinking (or even claude-4.6-sonnet-medium) model - ask it to launch a sub-agent - ask it why it cannot launch the subagent ### Expected Behavior it should be able to launch the sub-agents, since it is one of the few models that can actually do this typically. it seems like a missing tool declaration for the “Task” tool ### Operating System MacOS ### Version Information Version: 2.6.20 (Universal) VSCode Version: 1.105.1 Commit: b29eb4ee5f9f6d1cb2afbc09070198d3ea6ad760 Date: 2026-03-17T01:50:02.404Z Build Type: Stable Release Track: Default Electron: 39.8.1 Chromium: 142.0.7444.265 Node.js: 22.22.1 V8: 14.2.231.22-electron.0 OS: Darwin arm64 25.3.0 ### For AI issues: which model did you use? Opus 4.6 high-thinking Sonnet 4.6 medium-thinking ### For AI issues: add Request ID with privacy disabled not possible. I am on a corp account without control over public/private ### Additional Information this is critical functionality in my normal workflow ### Does this stop you from using Cursor Yes - Cursor is unusable ---
**Author:** ![cv\_intime](https://avatars.discourse-cdn.com/v4/letter/c/d07c76/32.png) [@cv\_intime](https://forum.cursor.com/u/cv_intime)\ **Post date:** [March 25, 2026, 2:34am UTC](https://forum.cursor.com/t/task-tool-missing-prevents-sub-agent-launch/155817/5 "2026-03-25T02:34:35Z")
Is anyone else experiencing this issue? ---
**Author:** ![cv\_intime](https://avatars.discourse-cdn.com/v4/letter/c/d07c76/32.png) [@cv\_intime](https://forum.cursor.com/u/cv_intime)\ **Post date:** [March 25, 2026, 6:02pm UTC](https://forum.cursor.com/t/task-tool-missing-prevents-sub-agent-launch/155817/6 "2026-03-25T18:02:49Z")
This is still happening today. How can I get this working? ---
**Author:** ![mohitjain](https://sea3.discourse-cdn.com/cursor1/user_avatar/forum.cursor.com/mohitjain/32/100229_2.png) [@mohitjain](https://forum.cursor.com/u/mohitjain)\ **Post date:** [March 26, 2026, 6:11am UTC](https://forum.cursor.com/t/task-tool-missing-prevents-sub-agent-launch/155817/8 "2026-03-26T06:11:52Z")
Hi @cv_intime, I’ve been looking into this on our end. The ability to launch sub-agents is controlled server-side, and based on your version (2.6.20), it should be available. I wasn’t able to pinpoint a specific change on our side that would have caused it to disappear. To help narrow this down, a couple of questions: 1. Is this still happening? A similar report from another user resolved itself after about a day. If you restart Cursor (fully quit and reopen) and start a fresh conversation, does the Task tool appear? 2. If it’s still happening, could you grab a Request ID from a conversation where the Task tool is missing? You can find it by clicking the “…” menu on any message in the Chat sidebar and selecting Copy Request ID. This lets us trace the exact request on our end and see why the tool wasn’t provisioned. (Request IDs don’t contain any code or prompt data, just a lookup key.) 3. Is this affecting all models or specifically Claude Opus 4.6 and Claude Sonnet 4.6? ---
**Author:** ![npoha](https://avatars.discourse-cdn.com/v4/letter/n/e19adc/32.png) [@npoha](https://forum.cursor.com/u/npoha)\ **Post date:** [March 26, 2026, 6:33pm UTC](https://forum.cursor.com/t/task-tool-missing-prevents-sub-agent-launch/155817/9 "2026-03-26T18:33:05Z")
Same issue at my side as well. ---
**Author:** ![cv\_intime](https://avatars.discourse-cdn.com/v4/letter/c/d07c76/32.png) [@cv\_intime](https://forum.cursor.com/u/cv_intime)\ **Post date:** [March 26, 2026, 7:17pm UTC](https://forum.cursor.com/t/task-tool-missing-prevents-sub-agent-launch/155817/10 "2026-03-26T19:17:57Z")
Hi @mohitjain ! Thanks for responding. 1. Yes this is still happening. I have restarted Cursor, updated Cursor to the latest version multiple times now, started new conversations, and tried it in a completely fresh and empty project. It still happens. This is how the thread goes (as well as every thread with any model i have available): > **Me:** > Do you have the ability to launch my subagent /product-owner with a simple request like “write a plan to add a header bar to the app” > > **Agent:** > Unfortunately, no — I don’t have the ability to launch subagents in my current session. While the system context references delegating to a `product-owner` subagent via a `Task` tool, that tool isn’t actually available in my current toolset. The tools I have access to are file operations, shell commands, search, web fetch, MCP tools, and a few others — but not subagent delegation. > > This is likely a Cursor limitation in the current mode. A few options: > > 1. **I can do the work directly** — e.g., if you want a plan for “add a header bar to the app,” I can switch to Plan mode and draft that for you myself. > > 2. **You could check if subagent support requires a specific Cursor configuration** — the `Task` tool may need to be enabled or may only be available in certain Cursor versions/modes. > > Would you like me to go ahead and help with the header bar plan (or whatever task you had in mind) directly? 1. I can grab this, but it probably wont be accessible to you. My company, at the global level, sets all our accounts to use Privacy Legacy, and that is unchangable for me. Here is the id for the thread above: 67d418ca-b51b-4215-8ede-54205776b25b 2. I have tested over 10 models (the top capable models) and none of them allow it, whether this is GPT, Claude, or Gemini. I hope this helps. ---
**Author:** ![mohitjain](https://sea3.discourse-cdn.com/cursor1/user_avatar/forum.cursor.com/mohitjain/32/100229_2.png) [@mohitjain](https://forum.cursor.com/u/mohitjain)\ **Post date:** [April 15, 2026, 6:06am UTC](https://forum.cursor.com/t/task-tool-missing-prevents-sub-agent-launch/155817/13 "2026-04-15T06:06:47Z")
thanks for the detailed info, and sorry for the delayed follow-up. I’ve traced the root cause. On your team’s plan configuration, subagents require a specific internal model (Composer) to run. If your team admin has restricted that model via the model blocklist, the Task tool won’t be available, which is why subagents can’t launch regardless of which model you select in the chat. Two paths forward: 1. **Ask your Cursor team admin** to check the model configuration and ensure Composer isn’t blocked. That should immediately restore subagent functionality. 2. **Try Max Mode** – when Max Mode is enabled, subagents use the parent model instead and bypass the Composer requirement. Note that Max Mode sessions count against your request budget. More details in the subagents FAQ here: [Why is my subagent using a different model?](https://cursor.com/docs/subagents) @npoha if you’re on a similar team configuration, the same guidance applies. ---
**Author:** ![system](https://sea3.discourse-cdn.com/cursor1/user_avatar/forum.cursor.com/system/32/99069_2.png) [@system](https://forum.cursor.com/u/system)\ **Post date:** [May 7, 2026, 6:07am UTC](https://forum.cursor.com/t/task-tool-missing-prevents-sub-agent-launch/155817/14 "2026-05-07T06:07:03Z")
Closed on May 7, 2026, 6:07am UTC This topic was automatically closed 22 days after the last reply. New replies are no longer allowed.