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## Thinking Path > - Paperclip is the open source app people use to manage AI agents for work > - Agents delegate by creating subtasks through Paperclip's tools. A tool error must tell the agent how to recover, or it improvises > - Restart chaos t06 ended a delegation with four children instead of two > - Evidence showed no replay: the model built an assignee id from two real agents' halves and got a bare `paperclip_runner_agent_not_found` four times > - To debug the error it created "diagnostic test" subtasks without an assignee. Those succeeded and were left behind as duplicates > - This pull request makes the error say which id was not found, which real agents it most resembles, and to call `list_agents` > - The benefit is that an agent corrects the id instead of creating throwaway tasks ## Linked Issues or Issue Description Refs #19831 (durable ownership plan). Restart chaos wave `w-20261108T225520-s9501`, task t06 (claude, M1, K2 drain). **Problem:** parent run 2751fe3c created Part 1 correctly. For Part 2 it passed `assigneeActorId: 0cb62ac2-742d-442c-acc9-d21dd936e716`: Chaos claude's prefix with Chaos codex's suffix. - Four `create_task` calls (keys `part2`, `part2` again, `-v2`, `-backlog`) each returned only `paperclip_runner_agent_not_found`. One of them crossed the K2 drain and failed the same way as the one before it. - The model then created "Part 2 06f119cf test" (`-noassignee`) and "Part 2 06f119cf" (`-title-test`), both described as "diagnostic test - will be removed/ignored". With no assignee they defaulted to the caller. They stayed in backlog. - Only after `list_agents` did it create the real Part 2. - Same-key replays were never the issue: `create_task` stores the `idempotencyKey` as the child's `origin_id`. ## What Changed - `server/src/services/native-runtime/paperclip-runner-tool-authority.ts`: - `create_task` (assignee) and `get_agent` now fail with `paperclip_runner_agent_not_found: no agent in this company has id "<id>". Closest ids: <name> (<id>), …. Call list_agents and copy a valid id exactly; nothing was created or changed.` - Suggestions are up to three agents of the caller's company whose ids share at least eight leading or trailing characters with the missing id. Another company's agents are never named. - The recoverable-read check matches the error code before the `:` details, so a recovered `get_agent` read still returns the error as a tool result. ## Verification Red/green: - `paperclip-runner-tool-authority.test.ts` "names a missing agent id and its closest real agent instead of a bare code (restart chaos t06)". It uses t06's spliced id, with a second agent "Chaos claude" in the company. - On master: the error is the bare code (red). - With this PR: both `create_task` and `get_agent` name the id, `Chaos claude (0cb62ac2-…)` and `list_agents`, and no task is created. - The file passes (42 tests), including the existing foreign-company assignee rejection. `tsc --noEmit -p server` is clean. ## Risks - One extra read of the company's agents, only on the failure path. - The message names agents of the caller's own company, which `list_agents` already returns to it. - No schema or persisted state change. ## Model Used Anthropic Claude Opus 5.5 (`claude-opus-5-5`), via Claude Code, with tool use (shell, file editing). ## Checklist - [x] I have included a thinking path that traces from project context to this change - [x] I have specified the model used (with version and capability details) - [x] I have checked ROADMAP.md and confirmed this PR does not duplicate planned core work - [x] I have searched GitHub for duplicate or related PRs and linked them above (#20069, #20108) - [x] I have either (a) linked existing issues with `Fixes: #` / `Closes #` / `Refs #` OR (b) described the issue in-PR following the relevant issue template - [x] I have not referenced internal/instance-local Paperclip issues or links (only public GitHub `#NNN` / `github.com/paperclipai/paperclip` URLs) - [x] My branch name describes the change (e.g. `docs/...`, `fix/...`) and contains no internal Paperclip ticket id or instance-derived details - [x] I have run tests locally and they pass - [x] I have added or updated tests where applicable - [x] I have updated relevant documentation to reflect my changes (no user docs affected) - [x] I have considered and documented any risks above - [ ] All Paperclip CI gates are green (pending) - [ ] Greptile is 5/5 with no open P2s, recommendations, or follow-ups (pending) - [x] I will address all Greptile and reviewer comments before requesting merge 🤖 Generated with [Claude Code](https://claude.com/claude-code) --------- Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>