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## Thinking Path > - Paperclip is the open source app people use to manage AI agents for work. > - Slack messages can create tasks and continue existing tasks. > - A reply in a subscribed thread can start agent work without a new mention. > - Some users want to control each reply with an explicit bot mention. > - This pull request adds a Require at-mention setting to Slack app settings. > - The setting checks new messages and queued messages before they start work. ## Linked Issues or Issue Description **What existing behavior does this improve?** Slack app settings and the rules that admit inbound messages. **Subsystem affected** Server, UI, database, and shared API contracts. **Current behavior** After the bot joins a thread, an ordinary reply can wake the agent. Direct messages do not need a bot mention. **Proposed behavior** Add Require at-mention below Allow direct messages. When enabled, each channel message, thread reply, and direct message must mention the bot. Direct messages must also be allowed. **Reason and benefit** Users can prevent ordinary conversation from starting agent work. **Breaking changes** New Slack connections require a bot mention by default. Existing connections keep their saved setting. Work that has already started is not cancelled. **Additional context** A search for existing at-mention PR titles found no duplicate. ## What Changed - Add the endpoint field, schema validation, API response, and UI toggle. New Slack connections enable the setting. - Add an idempotent database migration and generated metadata. Renumber it to 0321 after current master. - Check the current setting at inbound admission, task mutation, and the first heartbeat queue claim. - Keep Slack tool access and recovery for already-running work when the setting changes. - Cancel queued batches that contain an unmentioned input, including coalesced messages. - Dispatch promoted follow-ups after the scheduler releases its agent start lock. Preserve these checks in the new queue and run-control modules. - Filter unmentioned messages without retaining their content. - Keep provider-message deduplication and existing access checks. - Add thread, DM, duplicate-delivery, queued-message, and new-connection default regression tests. - Document the setting and its scope. ## Verification - Previous head `16791bb7`: typecheck, build, all server shards, Runner checks, and E2E passed. Two chat shards failed in three fixtures that used unmentioned Slack messages. - Update setup follow-ups to mention the Slack bot. Disable the mention rule explicitly in the callback ordering test, which tests ordinary subscribed replies. - Previous local checks passed: six Slack integration cases, all 46 durable chat scheduler tests, all 24 queue/run-control tests, migration safety, and UI token gates. - Greptile reviewed `16791bb7` with 5/5. All review threads are resolved. - Head `53163c20f`: all five focused integration cases passed. These cover all three prior CI failures and both default-on channel/DM cases. Fresh CI and Greptile are running. - Full local recursive typecheck, build, and repository tests were not repeated for this fixture-only change. CI supplies these checks. - Manual check: create a Slack connection. Require at-mention must be on. An ordinary thread reply or DM must not wake the agent. A bot mention must wake it once. Disable the setting and confirm ordinary replies work again. ## Risks - The migration adds a non-null boolean with a false default. Apply it before the new server runs. - The setting also applies to DMs. The UI help text states this. - Enabling it blocks queued unmentioned work but does not cancel a run that has already started. - Full local verification is limited by the environment constraints above; latest-head CI must pass before merge. ## Model Used OpenAI GPT-6 (Codex agent), with reasoning, tool use, and code execution. The runtime does not expose a more specific model version or context-window size. ## 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 - [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 - [x] I have considered and documented any risks above - [ ] All Paperclip CI gates are green - [x] Greptile is 5/5 with no open P2s, recommendations, or follow-ups - [x] I will address all Greptile and reviewer comments before requesting merge --------- Co-authored-by: Paperclip <noreply@paperclip.ing>