## Thinking Path > - Paperclip is the open source app people use to manage AI agents for work. > - Remote native runs use a provider pack. The controller reuses a protected pack from the sandbox image when the pack is compatible. > - #17749 gates this reuse on a hand-maintained interface revision in `provider-pack-contract.json`. > - Later changes altered the runner/pack boundary (#17922, #18188), but nobody bumped the revision. A stale Claude or Codex image pack can still be reused across a sidecar contract change. This is the failure class of #17972. > - A manual revision has a "forgot to bump" failure mode. Source-byte hashes change on every refactor, so they are too brittle. > - This pull request declares the sidecar `session.open` contract in its JSON schema and computes a contract digest from the JSON contracts and Rust shapes. > - Image-pack reuse now requires an equal digest. > - The benefit is that an incidental change keeps image packs reusable, and a real contract change retires them automatically. ## Linked Issues or Issue Description Refs #17749, #17972, #17922, #18188. **What happened?** The controller reused an image provider pack when `compatibility.acpx` and the selected agent's profile digest matched. For Claude and Codex, that profile digest binds only the upstream executable. The ACPX interface revision stayed at 1 after later sidecar contract changes. A pack built before those changes passed the reuse check. **Expected behavior** The controller reuses an image pack only when the pack uses the same runner/pack contracts as the controller's bundled pack. Comments, formatting and refactors do not change that result. **Steps to reproduce** 1. Build an image pack from a commit before a sidecar input change, such as a new `session.open` field. 2. Run a controller from a later commit that sends the new field, with the same interface revision and Claude version. 3. Before this fix, `verifyRemoteProviderPack` accepts the old image pack. ## What Changed - Declare the sidecar `session.open` parameter set as a closed `sessionOpenParams` definition in `acpx-sidecar.schema.json`. - `generate-acpx-sidecar-contract.mjs` now generates `GENERATED_ACPX_SIDECAR_OPEN_PARAMS` from it. - `parseOpenParams` uses the generated list instead of an inline `Set`. The accepted set is unchanged. - This is the surface of #17972. The schema is now its source of truth. - Declare the nested `session.open` contracts that the sidecar parses strictly: - `protocol/provider-schemas/runtime-context.schema.json` closes every runtime context object. `parseNativeRuntimeContext` uses the field lists that `scripts/generate-runtime-context-contract.mjs` generates from it. - The sidecar schema declares the closed `providerPolicy` object, and `parseProviderPolicy` uses its generated field list. - The accepted fields do not change. - Add `packages/paperclip-runner/scripts/contracts/contract-fingerprints.mjs`. It fingerprints these contracts: - the PRP and sidecar JSON schemas, with annotation text removed - the generated catalogs in `generated/` - the Rust serde shapes, `json!` payload keys, match literals and env keys in `runner-core/src`, without test-only modules - the reserved env key lists in `configured_environment.rs` - Read only the trees that every pack build context contains. Fail when a registered source is missing, so two build contexts cannot silently produce different digests. - Use only Node built-ins. The registry adds no dependency. - Write `contractDigest` as a top-level payload field in `build-provider-pack.mjs`. The manifest digest algorithm and the existing field layout do not change. - Require an equal `contractDigest` for image-pack reuse in `remote-provider-pack-verification.ts`. A pack without a digest is not reused. The controller uploads its bundled pack, as it does today for any incompatible pack. - Re-attest the source-hashed profiles, because this PR changes their bound sidecar sources: - Grok becomes profile 15 and now also binds the generated allowlist, so a Grok field change in the schema still invalidates the Grok identity. - Copilot becomes profile 88, and also binds the generated runtime context fields. - Earlier profiles stay decodable. - Add the registry script and `generated/` to the Daytona image content inputs. - Document the digest and the schema-first rule in `docker/daytona-runner/README.md` and `doc/DEVELOPING.md`. ## Verification - `node --test scripts/contracts/contract-fingerprints.test.mjs` (in `packages/paperclip-runner`): 4 tests pass. - These changes keep the digest: - schema description text - schema reformatting - renaming `parseOpenParams` - Rust comments, `#[serde(skip)]` fields and `#[cfg(test)]` modules - edits to the `#[path]` test module `tests/provider_api_validation.rs` - These changes alter the digest: - a new `session.open` schema field - a changed constraint on the `remainingWork[].description` property - a new reserved env key - a new sidecar env key - a new checkpoint field - A build context without a registered source fails. - `node --test test/acpx-sidecar-contract.test.mjs`: 13 tests pass. A new case rejects an unknown `session.open` parameter and accepts each declared parameter. - `node --test scripts/grok-profile-identity.test.mjs`: 4 tests pass. A change to the Grok field in the generated allowlist invalidates the Grok identity. - `generate-acpx-profiles.mjs --check`, `generate-acpx-sidecar-contract.mjs --check` and `generate-protocol-manifest.mjs --check` pass. - Runner vitest suites pass: 470 passed, 1 skipped. They cover the sidecar, sidecar input and protocol, Copilot and Pi installation, profile compatibility, native execution, recovery identity, the backend factory and the environment. - Server tests: pack verification, executor and artifact preparation pass (1,004 tests). - `tsc --noEmit` passes for `packages/paperclip-runner` and `server`. - `tests/runner-e2e/daytona-image.test.ts`: 10 of 11 tests pass. The failing test also fails on `master`. It expects a literal `profile-v19-identity.json` line in `.dockerignore`, which uses a `profile-v*` glob. - Not run locally: - A complete `build-provider-pack.mjs` run. The builder rejects the local Homebrew Node because it is not portable after relocation. - Rust tests and `acpx-controller-recovery.test.ts`, because `cargo` is not installed. - The full `pnpm -r typecheck`, `pnpm test:run` and `pnpm build`. ## Risks - Only JSON contracts and Rust shapes are part of the digest. The remaining TypeScript-only definitions are the `paperclip_finish` and `paperclip_block` tool schemas in `completion-result.ts` and the TypeScript env key lists. They are not covered until they move into a schema. The nested `expectedIdentity` and `tools` values ignore unknown fields, so a change there cannot cause a startup rejection. - A change there can let a stale image pack be reused. The sidecar then rejects the input with its strict parser error. - Today, Claude and Codex image packs have no contract check at all. - The digest covers all registered contracts for the whole pack. A contract change for one provider kind also retires image packs for the other. Each replacement costs about 16 s per remote start until the image is refreshed. - Existing image packs have no digest. After deploy, the controller uploads its bundled pack until the image is rebuilt. - The Grok and Copilot re-attestations start fresh sessions for those agents once after deploy, as each profile bump does today. - The Daytona image content ID formula changes, so the next image build does not reuse a cached image. > 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 Anthropic Claude Opus 5.5 (`claude-opus-5-5`) through Claude Code in the desktop app, with repository tools, shell execution and research subagents. The session does not expose the 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 - [ ] 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 🤖 Generated with [Claude Code](https://claude.com/claude-code) --------- Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Paperclip Daytona runner image
Ordinary provider packs now include pinned Cursor assets for Linux x64; no
--candidate-providers=cursor flag is needed. Cursor admission is enabled after
the production readiness gates
passed. The public CLI installation command is paperclipai runtime setup cursor;
it runs explicitly on the execution host and is never an npm installation hook.
This image is the Paperclip Cloud fleet sandbox image plus a source-built
paperclip-runnerd and immutable provider pack. The pack contains Node 24.11,
OpenCode 1.18.34, the compiled OpenCode proxy, ACPX 0.13.1 sidecar, qualified ACP
agents, and the production lockfile. Its manifest digests each executable bridge
and records the runner source revision as provenance. Its interface declaration
allows compatible app releases to reuse it without uploading or installing a pack.
The fleet pins are intentionally copied from
paperclip-cloud/fleet-sandbox-image/Dockerfile.
Update both definitions together until the fleet base is published as a stable
image that this Dockerfile can extend directly.
Harness versions
The October 2026 refreshes pin Codex 0.160.0, Claude Agent SDK 0.3.286 (Claude Code 2.1.286), and OpenCode 1.18.34 in the shared provider pack. Claude Code 2.1.280 is the minimum for Opus 5.5 and 2.1.284 is the minimum for Sonnet 5.5; the pinned runtime also supports Fable 5.1. Codex 0.160.0 ships bundled metadata for the current GPT-6.1 Sol, GPT-6 Sol, and GPT-6 Luna model IDs. The sandbox layer pins Grok CLI 1.0.70, Gemini CLI 0.65.0, Kimi Code 2.3.3, Cursor CLI 2026.10.22-27dcf5f, and GitHub CLI 2.103.3 (October 2026 refresh). The native Cursor provider uses its separately verified distribution, pinned to 2026.09.26-dd393fe; it does not use the sandbox layer’s global Cursor executable. Grok CLI 1.0.70 supports the current Grok 4.7 model family. Hermes stays at 0.19.0, the newest release on PyPI.
Keep the patched ACP bridge versions separate from their CLI runtime pins. Their executable digests do not change when only the runtime dependency changes. Refresh the runtime executable digests from integrity-verified npm release archives for every supported platform, and keep the native runner, provider manifest, and remote controller version checks aligned.
Build and verify
Run pnpm --filter @paperclipai/paperclip-runner test:opencode:qualification
after installing dependencies to exercise the actual pinned OpenCode executable.
It checks health/version, session creation and retrieval, SSE messages, an async
prompt, and session deletion against a loopback mock provider. It uses an
isolated home, starts no paid model request, and retires its process group.
Set PAPERCLIP_TEST_OPENCODE_BINARY to the materialized Linux executable when
qualifying an assembled provider pack.
The fleet image is currently amd64-only because the pinned Cursor and GitHub CLI checksums cover amd64.
content_id="$(pnpm --silent test:e2e:runner:image-id)"
docker buildx build \
--platform linux/amd64 \
--build-arg PAPERCLIP_RUNNER_CONTENT_ID="${content_id}" \
--build-arg PAPERCLIP_RUNNER_SOURCE_REVISION="$(git rev-parse HEAD)" \
--tag "paperclip-daytona-runner:e2e-content-${content_id}" \
--load \
--file docker/daytona-runner/Dockerfile \
.
docker run --rm --platform linux/amd64 \
--entrypoint paperclip-runnerd \
"paperclip-daytona-runner:e2e-content-${content_id}" \
--build-metadata
The metadata must advertise dial_ws_loopback, dial_wss, and listen_ws.
The explicit entrypoint is needed only for this local probe because Daytona's
base image uses its own long-running sandbox entrypoint.
test:e2e:runner:image-id hashes the audited Docker build dependency closure,
target platform, the immutable Dockerfile syntax-frontend digest, and every
immutable FROM reference. It fails before the paid workflow can build when
the frontend or a base is not pinned to a sha256 digest. When updating the
syntax version, resolve and review its registry digest and update both values in
the first Dockerfile line. Git commits that do not change those inputs reuse the
same content tag.
PAPERCLIP_RUNNER_SOURCE_REVISION remains the full Git SHA that built the first
published copy and is retained as provenance rather than cache identity.
Use in Paperclip
Publish the image to a registry Daytona can pull, or use the environment
editor's Configure image flow to produce a Daytona snapshot. Set the
environment image to that immutable tag or snapshot. Paperclip probes the
sandbox user's PATH for paperclip-runnerd and codex and checks
/opt/paperclip-runner/provider-pack for OpenCode and ACPX. It uses the pack
when its selected provider interface and platform are compatible. App source
revisions and unrelated provider pins do not force an update. Startup reads the
small manifest in the existing runner metadata query. It does not scan the pack,
run a version command, or transfer files on this path. Otherwise it stages the pack configured by
PAPERCLIP_RUNNER_REMOTE_PROVIDER_PACK_PATH. Remote OpenCode and ACPX never
fall back to host-local processes.
src/live/provider-pack-contract.json in the Runner package declares the
OpenCode and ACPX interface revisions. Change a revision only for an incompatible
runner/pack boundary change, and qualify the new pack before publishing it.
Bumping a revision also retires every older image pack.
The pack build also records a contractDigest, computed by
scripts/contracts/contract-fingerprints.mjs from the JSON contracts under
protocol/ and generated/ and from Rust serde shapes, payload keys, match
literals and env keys, rather than from source bytes. An image pack is reused
only when its digest equals the controller's bundled pack; comments and
refactors leave it unchanged, so a mismatch means a contract changed and the
controller uploads its bundled pack. Packs without a digest are not reused.
Define a new runner/pack contract in a schema under protocol/ and generate the
TypeScript from it, as the sidecar's session.open parameter allowlist is
generated from acpx-sidecar.schema.json; TypeScript-only definitions are not
part of the digest.
Dependency versions and Git SHAs remain build provenance. ACPX retains its
selected agent's qualified profile checks.
The image build makes the pack root-owned and non-writable to the execution user. Fast admission requires protected ancestors and manifest, with no writable path alias. Task-owned packs and older packs without an interface declaration keep full content verification. An attached session retains the exact pack and daemon identity admitted at launch. Publish one new image with the interface declaration to enable reuse across later compatible app releases.
Do not promote paperclip-runner-e2e-20260826-v2 for OpenCode or ACPX. Build a
new immutable image or snapshot from a clean committed revision and pass that
full Git SHA as PAPERCLIP_RUNNER_SOURCE_REVISION.
Do not bake provider credentials, Paperclip bootstrap tickets, or Daytona preview tokens into this image. They remain per-run secret material.
The provider-pack build pins the official Linux x64 Node 24.21.0 image by manifest digest. Its bundled Undici is 7.29.1, which fixes GHSA-3wwx-pv8p-q78v. Pi separately verifies its private Node executable and nested npm dependency; changing the outer interpreter does not replace either provider-owned pin.
Provider CLI updates are manifest-only changes: repository CI owns the root
lockfile. Resolve the complete workspace manifest graph in the build context
before invoking Docker, matching CI when a source commit precedes the lockfile
bot. The trusted workflow supplies this resolved lockfile as an immutable artifact.
The complete resolved lockfile must match PAPERCLIP_RUNNER_LOCK_SHA256 before
package installation or lifecycle execution. Review and refresh that digest
with source dependency changes; registry-time resolution drift fails closed.
The Product E2E workflow resolves one lockfile before the image build. It
verifies the downloaded artifact, then passes that artifact's SHA-256 as the
PAPERCLIP_RUNNER_LOCK_SHA256 build argument. The Dockerfile checks the resolved
lock against this value before installation. The fixed Dockerfile default is
for standalone builds; it must not replace a campaign's verified lock digest.
Refresh the default from the clean tracked lockfile using the exact
pnpm install --resolution-only --ignore-scripts --no-frozen-lockfile command,
and verify a second resolution preserves the digest. A lockfile left by a
filtered or incremental install can retain stale importer patch identities.
Refresh exact runtime versions and qualification digests together; do not
download dependencies when a task starts.
Candidate ACP qualification assets
Provider branches can build their pinned assets with
node packages/paperclip-runner/scripts/build-provider-pack.mjs /absolute/pack --candidate-providers=cursor
(or copilot or pi). The source revision must include the named provider's
builder. Assets are installed at build time under provider-assets/<provider>/<platform>-<architecture>.
The pack manifest binds each complete asset tree. Runtime admission separately
checks the provider's source-owned closure pins and copies a verified launch snapshot.
A pack with candidate assets does not qualify or enable that provider.
For an isolated Linux x64 Daytona qualification image, pass
--build-arg PAPERCLIP_RUNNER_CANDIDATE_PROVIDERS=cursor with the normal build arguments.
Compute its content ID with the same selection:
pnpm --silent test:e2e:runner:image-id --candidate-providers=cursor.
Candidate assets and the default pack have distinct image identities. Never reuse
the default image's content ID for a candidate build.
Use each provider branch's recorded version and explicit model. Keep credentials
out of images. Paid qualification requires bound provider and Daytona credentials,
inspectable spend, and the shared $100 ceiling recorded in the capability report.
The pack builder tests its copied Node interpreter after relocation. Use a
standalone Node distribution if the host interpreter depends on a package manager's
private shared libraries. Pi additionally pins its complete portable interpreter
and npm dependency graph.
Refresh exact runtime versions and qualification digests together; never download
dependencies when a task starts. Grok's additive native ACP profile keeps its
qualified 1.0.13 executable at the verified sandbox prerequisite path. It does not replace the
legacy adapter's grok command on PATH.
Native Grok is an image prerequisite at /opt/paperclip/providers/grok/1.0.13/grok.
Its checksum-verified provisioning is separate from the provider pack, which ships
only the built-in launcher. Public npm installation never downloads this binary.