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## Thinking Path > - Paperclip is the open source app people use to manage AI agents for work > - Native Runner runs start a provider session with the `session.open` command before any prompt > - A definite `session.open` rejection is treated as a pre-session failure and gets a bounded same-run bootstrap retry > - The runner also reports a closed classification. Two classifications say that the provider cannot run the selected model: `requested_model_unsupported` and `grok_model_mismatch` > - Paperclip ignored that classification. It scheduled a retry that must fail the same way. On a remote sandbox with a retained runner PID, the due retry entered restart recovery. Restart recovery has no checkpoint for a bootstrap retry, so it failed closed as `native_restart_recovery_blocked` / `ambiguous_remote_recovery_evidence` > - The task then stayed `blocked`. The recovery actions settled as no-replay holds, so no active action told anyone to change the model, and the parent task stalled too > - This pull request classifies those two definite rejections as the existing `native_provider_model_rejected` failure > - The benefit is a terminal failure on the first attempt, an accurate error, and an active board recovery action that names the next step: choose a supported model ## Linked Issues or Issue Description **What happened?** On a hosted staging instance, a Grok agent run failed at `session.open`. The runner log said `ACPX sidecar command session.open was rejected (retryable=false, classification=grok_model_mismatch)`. Paperclip recorded `recoveryMode: "bootstrap_retry"` and scheduled a same-run retry 30 seconds later. The run had a remote sandbox and a recorded sandbox PID, so the due retry went to restart recovery. Restart recovery found no checkpoint and no provider events and failed closed with `ambiguous_remote_recovery_evidence`. The run ended as `native_restart_recovery_blocked`. The task stayed `blocked` with no active recovery action for more than one hour. Its parent task stayed blocked on it. **What did you expect to happen?** The selected model cannot start, so a retry cannot succeed. The run should fail once with the model-rejection error. The task should show the existing "choose a model" action, owned by the board, until someone changes the model and retries. **Steps to reproduce** 1. Start a native run whose `session.open` command fails with `classification=grok_model_mismatch` (or `requested_model_unsupported`). 2. Read the `native_run_finalizations` row. Before this change it is `retryable_failure` with `recoveryMode: "bootstrap_retry"` and a `nextAttemptAt`. 3. On a remote sandbox run with a recorded PID, the due retry enters restart recovery and fails as `native_restart_recovery_blocked`. **Paperclip version or commit** `master` at `f5f5184f23`. Related: #18910 routes due remote retries with a retained PID to restart recovery. #18908 continues verified failed native preparation. Open PRs #19177, #19180, #19182 and #19184 change no-replay hold settlement and workspace hold release. They do not change this classification. This PR does not duplicate them. ## What Changed - `nativeSessionFailureSourceCode` (`server/src/services/native-runtime/native-session-executor.ts`) returns `native_provider_model_rejected` for a definite `session.open` failure or rejection whose runner classification is `requested_model_unsupported` or `grok_model_mismatch`. Other definite `session.open` rejections still return `provider_session_open_rejected` and keep the bounded startup retry. An indeterminate `session.open` outcome stays `native_session_interrupted`. - `native_provider_model_rejected` is already a permanent failure. The run stops on the first attempt with no `nextAttemptAt`, so it never enters the restart-recovery retry path. - When no provider session exists, the coordinator `nextAction` and the board recovery action `nextAction` say: choose a supported model for this agent, then retry the task. - The existing product paths for `native_provider_model_rejected` apply: the task presentation shows `choose_model`, and the recovery service treats it as `configuration_incomplete`. - `doc/execution-semantics.md` describes the rule under "Native provider model capacity". ## Verification Red before the fix (new test, unchanged production code): ```sh cd server && npx vitest run src/services/native-runtime/native-startup-retry.integration.test.ts # Tests 2 failed | 21 passed # failureCode: native_session_interrupted, phase: retryable_failure, recoveryMode: bootstrap_retry, # nextAction "Retry provider bootstrap on this same run ..." - the same record seen on staging ``` Green after the fix: ```sh cd server && npx vitest run src/services/native-runtime/native-startup-retry.integration.test.ts # Tests 23 passed cd server && npx vitest run src/services/native-runtime/native-session-executor.test.ts \ src/services/native-runtime/native-startup-retry.integration.test.ts src/services/task-interruption-presentation.test.ts # Test Files 3 passed, Tests 1186 passed pnpm --filter @paperclipai/server typecheck # exit 0 ``` The new integration cases use embedded PostgreSQL and the real executor failure path. For both classifications they check: - coordinator `terminal_failure`, `failureCode: native_provider_model_rejected`, `nextAttemptAt: null`, attempt 1 - run `failed` with `errorCode: native_provider_model_rejected` - task `blocked`, execution lock released - an `active` board recovery action with cause `native_provider_model_rejected`, return owner set to the agent, and the choose-model next action - `settleUnrecoverableExecutions` leaves the action `active`, so it does not become a silent no-replay hold - `claimNativeSessionResumptions` claims nothing, so there is no second executor The unit test also checks that `session_ensure_failed` keeps its bounded retry and that an indeterminate model rejection stays unclassified. A live Grok run with a mismatched model was not run. The failure record in the test matches the staging record field by field. ## Risks - Low risk. The change adds two closed runner classifications to an existing permanent failure code. Other `session.open` rejections keep their current retry. - A model mismatch that a retry could fix would now need an explicit retry. The runner already marks these rejections `retryable=false`. - This PR does not change restart recovery. A remote bootstrap retry with a retained sandbox PID for other `session.open` causes can still fail closed as `ambiguous_remote_recovery_evidence`. That needs a separate change with remote stop evidence. > For core feature work, check [`ROADMAP.md`](ROADMAP.md) first and discuss it in `#dev` before opening the PR. Feature PRs that overlap with planned core work may need to be redirected — check the roadmap first. See `CONTRIBUTING.md`. ## Model Used - Claude Opus 5.5 (Anthropic), model ID `claude-opus-5-5`, used in Claude Code with tool use (shell, file edits, browser reads of the staging API). It did the investigation, code change, tests and PR text. ## 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 - [x] 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 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>