## Thinking Path
> - Paperclip is the control plane for agents that perform work.
> - Paperclip Runner connects durable provider sessions to individual
task runs through PRP.
> - Provider continuity and per-run authority are different lifetimes.
> - The existing implementation mixed those lifetimes and lost event
metadata between provider frames, runnerd, persistence, API
sanitization, and the task thread.
> - That caused failed continuation, missing progress and Plans,
duplicate replies, hidden failures, and unsafe recovery.
> - This repair gives every heartbeat fresh authority, preserves
qualified provider-session continuity, and restores one lossless
presentation path without changing direct adapters.
## Linked Issues or Issue Description
**What happened?**
A second native heartbeat could reuse tickets, leases, command receipts,
sequence state, and run identity from the first heartbeat. Provider
phase and item identity could be lost before the UI read them. Redaction
could corrupt protocol discriminators while still missing malformed
credential tails. The task thread could fold progress into the final
response, hide failures, or show more than one final answer. Native
Codex also exposed approval modes that do not yet have a durable
approval bridge.
**Expected behavior**
Each heartbeat uses a new PRP authority epoch. Codex and OpenCode
preserve exact qualified provider sessions; ACPX emits an explicit
continuity event when its qualified process-replacement policy is used.
Every accepted provider event is presented, classified as internal, or
surfaced as unsupported. The task page shows chronological progress,
reasoning summaries, activity, Plans, interactions, terminal failures,
and exactly one final reply. Direct adapters retain their existing path.
**Steps to reproduce**
1. Enable the unified experimental Paperclip Runner setting.
2. Create a local native Codex, OpenCode, ACPX Claude, or ACPX Codex
agent.
3. Run response, Plan, structured-question/resume, restart,
cancellation, and failure scenarios.
4. Reload the task while active, waiting, failed, and settled.
5. On the old implementation, observe stale run authority, missing
classifications, incomplete output, or duplicated/folded replies.
**Paperclip version or commit**
The repair is based directly on `master` at
`87d05e194b643810d16d20612115acd01d735d43`.
**Deployment mode**
Local development with the embedded database.
Related work: Refs #12616, #12646, #12666, #12685, and #12700.
## What Changed
- Rotates PRP control-plane, outbox, ticket, lease, command, receipt,
and sequence authority for each heartbeat while carrying forward only a
validated provider-session identity.
- Reads `control-plane-state.json`, validates both durable schemas and
lifecycle values, resumes coherent current runs, archives qualified
settled authority, and quarantines malformed or mismatched scoped state
without moving ambiguous live legacy state.
- Preserves Codex provider phase and stable item identities so
commentary remains progress and only `final_answer` becomes final.
- Adds raw OpenCode HTTP/SSE boundary coverage and canonical reasoning
lifecycle mapping.
- Makes ACPX normalization lossless for visible reasoning, tool
lifecycle metadata, stable bounded identities, Plan revisions,
structured requests, failures, and qualified process replacement. Only
the compatible terminal assistant message is promoted as final.
- Applies schema-aware redaction before generic JWT-shaped detection and
scans every diagnostic string leaf. Malformed raw/escaped quoted
credential tails are redacted in both server and durable Rust state.
- Restores snapshot-style chronological task presentation, expandable
tool activity, inline Plan cards, visible waiting/resume/cancel/failure
states, and exactly one final answer.
- Makes `never` the only qualified native Codex permission mode and
rejects unsupported persisted native modes with remediation. OpenCode
and ACPX policies remain intact.
- Keeps the unified experimental Runner setting as the only enablement
flag. Onboarding and direct Codex, Claude, and OpenCode stay on their
legacy execution/finalization paths.
- Adds cross-language goldens, authority/recovery/fault coverage, exact
response/count assertions, and native plus legacy acceptance scenarios.
## Verification
- Pull-request GitHub Actions run Rust formatting/tests, TypeScript
checks, server/UI tests, builds, protocol drift checks, browser E2E, and
security scans.
- A separate workflow-only validation ref is pinned directly on this PR
head and runs the 35-cell paid local matrix: three core scenarios plus
structured-question resume and restart/resume for native Codex, native
OpenCode, ACPX Claude, ACPX Codex, and direct Codex/Claude/OpenCode.
Run: https://github.com/paperclipai/paperclip/actions/runs/33682434315
- Acceptance requires exact single visible replies, monotonic sequences,
matching envelope discriminators, one semantic terminal, one run
terminal, no unresolved interaction, no duplicate mutation, no secret
leakage, provider continuity, and zero native rows for direct adapters.
- Per maintainer direction, tests are running in GitHub Actions rather
than on the slower local host. Only formatters and static diff checks
were run locally.
## Risks
- Recovery from old or partial filesystem state is sensitive. The repair
fails closed, preserves active or unverifiable authority, and
quarantines only state whose scoped ownership is safe to move.
- Provider event formats can change. Closed validators and boundary
goldens turn new or malformed events into visible diagnostics instead of
silent drops.
- Shared task presentation could affect direct adapters. Runtime-fact
gating plus the direct-adapter matrix protect the existing path.
- Managed and remote providers are not qualified here. Shared code
continues to compile and fail safely, but live qualification is
deferred.
> 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
OpenAI Codex based on GPT-5. The exact deployed snapshot and
context-window size are not exposed to this task. It used agentic
reasoning, repository inspection, code editing, Git, parallel subagents,
and GitHub Actions.
## 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 and contains no internal
Paperclip ticket id
- [ ] I have run tests locally and they pass (intentionally deferred to
GitHub Actions)
- [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 risks above
- [ ] All Paperclip CI gates are green
- [ ] The paid local-provider matrix is green
- [ ] Greptile is 5/5 with no open P2s, recommendations, or follow-ups
- [x] I will address all Greptile and reviewer comments before
requesting merge
## Thinking Path
> - Paperclip is the open source app people use to manage AI agents for
work.
> - The runner package keeps provider sessions durable across process
restarts.
> - The merged Codex ACPX backend can admit a new qualified session
through the package factory.
> - It cannot yet recover a settled session from a durable checkpoint.
> - Recovery must prove the same provider identity, runtime root,
workspace, and latest terminal settlement before it resumes.
> - ACPX cannot yet prove continuity for a provider turn that was active
when the process stopped.
> - This pull request recovers only settled Codex ACPX checkpoints and
rejects ambiguous or stale state.
> - The benefit is fail-closed restart recovery without repeated work,
silent session replacement, or recovery of an older semantic result.
## Linked Issues or Issue Description
Refs #12406
This pull request builds on the Codex ACPX backend route merged in
#12406. It adds only settled-session recovery and the package-local
durability and filesystem checks that recovery requires.
## What Changed
- Add settled-session recovery to the Codex ACPX harness driver and
advertise resume support for that bounded path.
- Keep provider recovery on the same persisted ACPX session. Do not
permit a replacement provider session.
- Require persisted run, normalized session, provider, profile,
workspace, permission, result, terminal, and recovery-policy identities
to agree.
- Reopen the provider with the exact persisted ACPX identity and reject
provider or qualification drift.
- Restore the last source sequence, terminal history, semantic result,
provider recovery policy, and normalized terminal fact before new work
can start.
- Clear a stale active-turn marker only when durable terminal history
proves that exact turn settled.
- Reject active-turn recovery when durable history cannot prove
provider-turn continuity.
- Require a semantic result to belong to the latest completed terminal
settlement.
- Reject an older completed semantic result when a later identical retry
failed or was interrupted.
- Reject resultless recovery unless the latest terminal turn completed
successfully.
- Bound terminal history and semantic-result recovery by entry count,
aggregate bytes, fingerprint bytes, node count, and nesting depth before
cloning or serializing persisted data.
- Read the private workspace record through pinned namespace,
runtime-root, record, and workspace identities.
- Reject symbolic links, substituted directories, replaced records,
invalid files, root workspaces, and workspace changes during admission.
- Keep the recovery workspace lease pinned and revalidate it at the host
and provider-spawn boundaries.
- Retain and close a workspace lease that resolves after cancellation.
Close a partially recovered provider session if lease cleanup fails.
- Stage a valid isolated Codex credential in the runtime-open-boundary
regression so the test reaches and proves the intended workspace
revalidation fence.
- Add focused recovery tests for settled checkpoints, terminal
ownership, stale semantic results, active turns, identity drift, bounded
persisted data, cancellation, directory substitution, record
replacement, and spawn-boundary workspace replacement.
## Verification
- Replay base: `30ef14edd4e7290d9eac43ca7b7835611933cc74` (`master`
after #12406 merged).
- Exact replay head: `3d1b16d5cda2dd72f83785c921a025cc57aab8d6`.
- Stable patch ID for the exact replay delta:
`10742d7db00f801b5723e7a8582c637261ceb0dd`. The source-stack combined
patch was `4d7c9de72a0a30f6e33c935c092b745fe414c588`; the replay
preserves the newer unconditional provider process-group containment
from `master` while adding recovery workspace revalidation before spawn,
plus the exact-head credential fixture correction exposed by GitHub
Actions.
- The exact pull request delta contains exactly 14 files:
- `packages/paperclip-runner/src/backends/harness-driver-backend.ts`
-
`packages/paperclip-runner/src/backends/harness-driver-backend.test.ts`
-
`packages/paperclip-runner/src/backends/native-backend-factory.test.ts`
- `packages/paperclip-runner/src/drivers/acpx/codex-acpx-driver.ts`
- `packages/paperclip-runner/src/drivers/acpx/codex-acpx-driver.test.ts`
- `packages/paperclip-runner/src/drivers/acpx/codex-runtime-adapter.ts`
-
`packages/paperclip-runner/src/drivers/acpx/codex-runtime-adapter.test.ts`
- `packages/paperclip-runner/src/drivers/acpx/recovery-identity.ts`
- `packages/paperclip-runner/src/drivers/acpx/runtime-host.ts`
- `packages/paperclip-runner/src/drivers/acpx/runtime-host.test.ts`
- `packages/paperclip-runner/src/drivers/acpx/runtime-sandbox.ts`
- `packages/paperclip-runner/src/drivers/acpx/runtime-sandbox.test.ts`
- `packages/paperclip-runner/src/native-session-runtime.ts`
- `packages/paperclip-runner/src/native-session-runtime.test.ts`
- The exact combined delta is 2,279 additions and 73 deletions.
- This delta does not change dependencies, `pnpm-lock.yaml`, workspace
configuration, workflows, migrations, server selection, UI behavior, or
public package exports.
- Focused GitHub recovery tests: **PASS**. The exact-head Build job
passed the harness backend, native runtime, Codex ACPX driver, runtime
host, runtime sandbox, runtime adapter, and backend factory suites as
part of all 751 TypeScript runner tests.
- GitHub Actions: **PASS** for exact head
`3d1b16d5cda2dd72f83785c921a025cc57aab8d6`. Every applicable job passed.
The Storybook visual regression skipped intentionally because this
package-only delta does not touch UI or Storybook paths.
- Security checks: **PASS** for the exact head. Superagent, Snyk, both
Socket checks, and contributor trust completed successfully.
- Greptile: **5/5** for the exact head, with no open P1/P2 findings,
recommendations, or follow-ups.
- No local test result is claimed. GitHub Actions is the authoritative
verification environment for the replayed revision.
## Risks
This change has medium package-local risk because it admits persisted
state back into a provider session. Recovery fails closed when an active
provider turn has no matching terminal fingerprint, when a semantic
result is not owned by the latest completed settlement, when any durable
identity changes, or when the workspace cannot remain pinned through
provider spawn. Recovery never selects a replacement provider session.
Bounds prevent oversized or deeply nested persisted state from consuming
unbounded work before validation. The workspace lease prevents path
substitution during recovery admission. Existing direct adapters and the
Codex app-server driver do not use this ACPX recovery route. This change
does not add a migration, dependency, lockfile update, workflow, server
route, UI surface, public export, or production rollout flag.
> 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
OpenAI Codex with GPT-5.6, extended reasoning, repository tool use, and
code execution.
## 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/...`) and contains
no internal Paperclip ticket id or instance-derived details
- [ ] I have run tests locally and they pass
- [x] I have added or updated tests where applicable
- [ ] 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
## Thinking Path
> - Paperclip is the open source app people use to manage AI agents for
work.
> - The runner package hides provider behavior behind the
`HarnessDriver` contract.
> - The admitted Codex ACPX runtime can open sessions, execute bounded
turns, and use run-scoped semantic tools.
> - The package still needs a driver that translates those turns into
canonical PRP events and semantic results.
> - The driver must preserve terminal facts under backpressure and
retain cleanup ownership after caller-facing timeouts.
> - Abort can win after the host transfers a credential-bearing
admission but before the adapter body starts, so that boundary must
publish a completed cleanup proof without changing the exact
cancellation reason.
> - An external close can join an autonomous reconciliation attempt; if
it joins the exhausted final attempt, its batched intent must create one
new bounded generation when that exact cleanup fails.
> - A late cleanup failure needs a finite reconciliation budget that
cannot renew itself without a distinct external intent.
> - This pull request adds the Codex-only ACPX harness driver and the
package-local lifecycle rules it needs.
> - The benefit is a tested provider-neutral session boundary for later
runnerd and server integration.
## Linked Issues or Issue Description
Refs #12404
**Subsystem affected**
This change affects `packages/paperclip-runner`, the Codex ACPX driver,
and the provider-neutral native session runtime.
**Problem or motivation**
The package has an admitted Codex ACPX session, bounded turn control,
and authenticated semantic tools. It does not have a `HarnessDriver`
implementation that joins those parts and emits canonical PRP events. It
also needs bounded ownership for provider cleanup that settles after a
caller-facing timeout. Cancellation can win after the host schedules
runtime admission and transfers the staged credential but before the
adapter body starts; that rejected admission must still prove that
provider cleanup is complete so the credential can be scrubbed and later
admission can proceed. Separately, an external close that coalesces onto
an exhausted autonomous reconciliation must not lose its cleanup intent
if that exact protocol or provider-process cleanup fails.
**Proposed solution**
Add a Codex-only harness driver. It opens the admitted host, executes
one active turn, normalizes ACPX events, dispatches run-scoped tools,
and commits one schema-valid completion or blocked result. It provides
bounded event storage, interruption, transcripts, usage, snapshots,
diagnostics, and ordered close behavior. The native session runtime
quarantines incomplete cleanup before another session can enter the same
cleanup domain. The ACPX adapter records the immutable origin and
attempt number of each exact close attempt. Autonomous reconciliation
failures stay inside the three-attempt budget of the generation that
created them. External callers that join an attempt are represented by
one idempotent batched intent: success consumes it, failure on an
earlier attempt uses the remaining same-generation retries, and failure
on the exhausted final attempt creates exactly one new bounded
generation. Both direct and late protocol/provider cleanup outcomes use
the same rule. At the adapter entry boundary, an already-aborted
admission transfers an already-complete cleanup proof before rethrowing
the exact abort reason; the host retains credential cleanup until that
proof settles.
**Alternatives considered**
The multi-provider integration driver was not copied because it mixes
deferred providers and recovery behavior into the Codex path. Direct
server registration was also deferred because this package slice must
remain inactive and independently safe. Relabeling a coalesced
autonomous attempt as external was rejected because it would let
observers replenish retry budgets; starting another protocol close
before the exact retained attempt settles was rejected because it would
overlap cleanup ownership.
**Roadmap alignment**
This is package-local production hardening for the experimental runner.
It does not enable a new adapter or change current agent execution
selection.
## What Changed
- Add a Codex-only ACPX `HarnessDriver` and session implementation.
- Advertise only implemented capabilities. Keep resume, steering,
runtime request resolution, runtime request handoff, goals, and thread
lineage unavailable.
- Emit canonical PRP turn, transcript, tool execution, final reply,
result, failure, interruption, and usage facts.
- Dispatch authorized dynamic tools through the authenticated semantic
bridge.
- Validate and commit one completion or blocked result with disposition
and conflict checks.
- Add stable bounded event identities, one-active-turn admission,
terminal capacity reservation, and bounded interruption.
- Redact authorization credentials from emitted events and retained
transcripts.
- Add read, reconcile, transcript, usage, snapshot, status,
interruption, and ordered close surfaces.
- Retain and quarantine host cleanup that outlives a caller-facing close
bound.
- Gate new native-session admission on prior cleanup in the same cleanup
domain.
- Preserve durable success and governed waits while provider cleanup
continues under bounded ownership.
- Transfer a completed cleanup proof when cancellation wins before the
Codex adapter body, then preserve the caller's exact abort reason.
- Add a host-level regression proving staged credentials are scrubbed,
the credential lease can be reacquired, and a later runtime admission
succeeds after that pre-entry abort.
- Tag each exact ACPX close attempt with an immutable external or
reconciliation origin and immutable reconciliation attempt number.
- Keep timed-out autonomous reconciliation failures inside their
originating three-attempt budget.
- Batch concurrent external callers that join one reconciliation attempt
so they cannot mint independent generations.
- Consume a joined external intent on successful cleanup and on an
earlier failed attempt that still has same-generation retries.
- Renew exactly one bounded generation when a joined external intent
reaches a failed, exhausted final reconciliation attempt.
- Treat both protocol-close and provider-process cleanup failures as
failed intent settlement, including non-timeout and timed-out late
paths.
- Prevent a coalescing external observer from relabeling an immutable
autonomous attempt.
- Reset the finite reconciliation budget only for a distinct external
late-failure generation or one failed batched intent on an exhausted
final attempt.
- Isolate persistent-cleanup tests by cleanup domain and attach expected
rejection handlers before fake timers release them.
- Stabilize cleanup-settlement assertions exposed by GitHub Actions:
observe retained proofs without relying on callback order, wait for the
credential lease release rather than only the preceding credential-file
deletion, and use a supported scalar size assertion instead of an
unavailable Set matcher.
- Add focused tests for driver behavior, event validation, bounded
buffers, cleanup quarantine, admission gating, immutable attempt
origins, final-attempt intent batching, direct and late cleanup
failures, late success consumption, bounded reconciliation, exact
pre-entry cancellation, credential recovery, and durable native-session
outcomes.
## Verification
- Exact head: `584cc420f6ca249cdc0a831779192ca827764d96`.
- Stable patch ID for the combined exact delta:
`5329d8123baf62c339a15bdff16717b3803ebb74`.
- Stack position: #12404 is merged. This pull request targets `master`.
#12406 is stacked on this pull request.
- The exact pull request delta contains eight files:
- `packages/paperclip-runner/src/drivers/acpx/codex-acpx-driver.ts`
- `packages/paperclip-runner/src/drivers/acpx/codex-acpx-driver.test.ts`
- `packages/paperclip-runner/src/drivers/acpx/codex-runtime-adapter.ts`
-
`packages/paperclip-runner/src/drivers/acpx/codex-runtime-adapter.test.ts`
- `packages/paperclip-runner/src/drivers/acpx/runtime-host.ts`
- `packages/paperclip-runner/src/drivers/acpx/runtime-host.test.ts`
- `packages/paperclip-runner/src/native-session-runtime.ts`
- `packages/paperclip-runner/src/native-session-runtime.test.ts`
- `git diff --check` passed for the exact eight-file delta.
- This delta does not change dependencies, `pnpm-lock.yaml`, workflows,
migrations, server selection, UI behavior, or production runner wiring.
- GitHub previously exposed an unsupported Set matcher in the
cleanup-settlement regression; this exact delta uses the
repository-supported scalar `size` assertion without changing the tested
behavior.
- GitHub Actions: **PASS** for the exact head. The complete matrix is
green after a failed-job-only rerun cleared one unrelated
`plugin-worker-manager-duplex` flake; no patch or restack occurred.
- Security checks: **PASS** for the exact head (Superagent, Snyk,
Socket, and contributor trust).
- Greptile: **PASS, 5/5** on the exact head with no open P1/P2 findings,
recommendations, or follow-ups.
- No local test result is claimed. GitHub Actions is the authoritative
verification environment for this revision.
## Risks
This change has medium package-local risk. It adds a new driver and
changes native-session cleanup coordination. A lagging event consumer
could otherwise lose terminal state. The driver reserves terminal
capacity and rejects new work when bounded storage cannot safely accept
it. A stalled, rejected, or late provider close could otherwise overlap
a new session, retain credentials indefinitely, lose an external cleanup
request, or consume unlimited retries. Cleanup-proof transfer keeps the
staged credential owned across the pre-entry abort race, while the host
scrubs it only after the adapter proves that no provider resource
exists. Cleanup quarantine blocks conflicting admission and keeps exact
attempts owned. Immutable attempt origins and attempt numbers prevent
autonomous retries and coalesced observers from silently replenishing
the cap. One batched external intent can renew one generation only after
the exhausted final attempt fails; earlier failures remain within the
original generation, and success consumes the intent. Each renewed
generation remains capped at three autonomous attempts. The driver
reports recovery and other unimplemented capabilities as unavailable. No
server or runnerd factory selects this driver in this pull request.
> 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. See `CONTRIBUTING.md`.
## Model Used
OpenAI Codex with GPT-5.6, extended reasoning, repository tool use, and
code execution.
## 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/...`) and contains
no internal Paperclip ticket id or instance-derived details
- [ ] I have run tests locally and they pass
- [x] I have added or updated tests where applicable
- [ ] 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 P1/P2 findings, recommendations, or
follow-ups
- [x] I will address all Greptile and reviewer comments before
requesting merge
## Thinking Path
> - Paperclip is the open source app people use to manage AI agents for
work
> - The package now has bounded Codex transport, security, question,
diff, value, and thread helpers
> - Those isolated boundaries can now be composed into one provider
session lifecycle
> - The driver must preserve controller-owned identity, results,
terminals, and recovery invariants
> - Unsupported or mismatched provider traffic must fail closed without
weakening legacy adapters
> - This pull request adds only the Codex app-server driver and its
package-local tests
> - It does not expose or enable the Paperclip Runner adapter
## Linked Issues or Issue Description
**Subsystem affected**
`packages/paperclip-runner` Codex app-server session driver.
**Problem or motivation**
The runner needs a production-shaped Codex session implementation that
turns provider facts into canonical PRP events while keeping task
identity, semantic completion, runtime input, and recovery under
controller authority.
**Proposed solution**
Compose the previously reviewed transport and normalization boundaries
into a Codex-only harness driver with session open/resume, turns,
streaming events, semantic tools, structured questions, goals, lineage,
usage, cancellation, reconciliation, and deterministic persisted
snapshots.
**Alternatives considered**
Keeping the full implementation in one initial transport pull request
would obscure the trust boundaries. Adding the deferred ACPX or OpenCode
paths here would also broaden the provider scope beyond the Codex-first
series.
**Roadmap alignment**
This implements the Codex provider slice inside the package. It does not
enable the runner adapter or change any existing direct adapter path.
## What Changed
- Added the Codex app-server harness driver and session lifecycle.
- Added controller-bound semantic completion and terminal handling.
- Added runtime requests, structured questions, goals, lineage, usage,
steering, interruption, and recovery.
- Added workspace diff and file-reference projection.
- Connected bounded/redacted provider data and notification identity
checks.
- Kept deferred provider identities and replacement behavior out of the
Codex-only driver.
- Added 62 focused driver cases covering lifecycle, security, recovery,
and protocol failures.
## Verification
- `pnpm --filter @paperclipai/paperclip-runner test:typescript` (34
files, 337 tests)
- `pnpm -r typecheck`
- `pnpm build`
- The focused Codex driver suite has 62 passing cases.
## Risks
The main risks are accepting provider events from the wrong session,
duplicating terminal facts, retaining unsafe provider data, or resuming
a different session. Tests cover pre-turn, cross-thread, stale-turn,
post-terminal, duplicate-result, cancellation, transport loss, provider
identity, workspace, redaction, structured input, and recovery cases.
## Model Used
OpenAI Codex with GPT-5.6 and repository tool use.
## 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
- [ ] Greptile is 5/5 with no open P2s, recommendations, or follow-ups
- [x] I will address all Greptile and reviewer comments before
requesting merge
## Thinking Path
> - Paperclip is the open source app people use to manage AI agents for
work
> - The Paperclip Runner package needs one provider-neutral session loop
> - Native execution contracts now define the accepted input and output
> - Backends still need bounded execution, recovery, and control-plane
ports
> - This pull request adds that package-local session runtime
> - It does not change server runtime selection or start the
experimental runner
> - The benefit is a tested execution core for later provider and server
layers
## Linked Issues or Issue Description
**Subsystem affected**
packages/paperclip-runner
**Problem or motivation**
The runner contracts do not yet have a shared session loop. Each backend
would otherwise duplicate event handoff, terminal handling, recovery
cursors, timeouts, and checkpoint behavior.
**Proposed solution**
Add the native session runtime, backend interfaces, control-plane port,
harness driver contract, deterministic conformance helpers, and bounded
tests.
**Alternatives considered**
The server could own this loop. That would mix provider process behavior
with server persistence and authority logic.
**Roadmap alignment**
This is part of the existing experimental Paperclip Runner rollout. It
does not enable a production adapter.
## What Changed
- Add a provider-neutral native session execution loop.
- Add recovery cursor reconciliation and checkpoint hooks.
- Add bounded timeout and governed-wait behavior.
- Add harness driver and control-plane conformance helpers.
- Add deterministic backend and session runtime tests.
## Verification
- `pnpm --filter @paperclipai/paperclip-runner test:typescript`
- `pnpm --filter @paperclipai/paperclip-runner typecheck:typescript`
- `pnpm -r typecheck`
- `pnpm build`
- Protocol generation and manifest checks pass.
- The branch changes 14 files relative to its declared base.
## Risks
The main risk is a session that hangs, duplicates an event, or restores
the wrong cursor after reconnect. Tests cover terminal events, timeouts,
durable handoff, duplicate receipts, recovery, continuity breaks, and
checkpoint updates. The change remains package-local.
> 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
OpenAI Codex, `gpt-5`, with agentic reasoning, tool use, and code
execution.
## 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 and contains no internal
Paperclip ticket id
- [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
- [ ] Greptile is 5/5 with no open P2s, recommendations, or follow-ups
- [x] I will address all Greptile and reviewer comments before
requesting merge
Dotta