feat(sdk): isolate hosted Babysitter capability

[khaliqgant]

Summary

• add a Linux-only runner for the exact published native Babysitter artifact, importing it only inside bubblewrap user/PID/network/mount namespaces plus Node's permission model
• expose only f.capabilities.cloud.babysitterTurn.queue({ delivery }) and f.done; the original verified dispatch and immutable extension provenance stay in the parent
• bind execution to one opaque runtime generation and exact reviewed base, extension, and Surface runtime bytes
• keep fix(sdk): fail closed on hosted extension dispatch #549's generic executor refusal unchanged; this PR does not publish, enable, deploy, or merge the extension

Fail-closed boundary

The public path requires one opaque base/installation generation plus the symbol-branded verified delivery dispatch. It never executes tenant base code to derive identity: the parent requires the exact reviewed Software Factory flow SHA-256 and assigns the pinned software-factory@2.0.22 identity. Every dispatch rechecks current declarations and the complete project source generation, so caller-assembled, cross-project, cross-redeploy, stale, composed, lock-drift, and route-ambiguous inputs refuse before import.

Every installed artifact and manifest is reverified against the base/runtime, and the selected artifact must equal the reviewed native pin:

• ref github:AgentWorkforce/flows@8b33ebab8347514f80d9da5a81206a087f641714#extensions/babysitter
• digest bdf2187b9a242667d34bbc63e7a744753e146dc8cd6f4047047f2aed28f406ee
• manifest SHA-256 5631a06bbdc8186f4ee0ff955610ead24d001c5197b59fb1fe81fe422c44f226

The extension bytes are reread into bounded parent-owned buffers and rehashed. The six required Surface runtime files are independently SHA-256-pinned and read into parent-owned buffers. Bubblewrap receives every runner, extension, and Surface file over an inherited descriptor and --ro-bind-data, which copies it into a read-only mount before Node starts; there is no mutable host staging path, and live project, plugin-store, and Surface paths are never mounted. The runtime generation is checked again after the buffers exist and immediately before spawn.

The child runs beneath inherited hard limits of 16 GiB address space and 3 GiB data/anonymous memory (covering V8 reservations, heap, Buffer/native memory, mappings, and descendants); the separate 64 MiB old-space bound remains and receives a closed normalized GitHub descriptor and minimal Surface facade. It receives no workspace mount, inherited credentials, network, writable filesystem, subprocess permission, MCP, helpers, harnesses, base context, verified authority, or extension provenance. Descriptor 3 is hostile transport, not authority: every frame/request/receipt is validated in the parent, an exact direct frame can consume only the same one-shot delivery capability already granted, and premature/repeated/unknown frames fail.

The parent permits exactly one request and returns only { receiptId, status: 'queued' | 'duplicate' }. Typed Cloud refusals remain the parent rejection; the child sees only a fixed refusal marker. In-doubt timeout rejects without retry or fallback.

Rollout coupling (not enabled here)

• The host accepts only a base flow byte-identical to the reviewed Software Factory source SHA-256 49c993220b9c34fab2d4b0e51911656f62b8b657f534d988691960d45bb9d9b6 and assigns software-factory@2.0.22. Any Garden customization or source update refuses until a reviewed SDK pin is released, so fleet rollout must deploy those exact base bytes.
• The accepted extension ref is compiled into the SDK as github:AgentWorkforce/flows@8b33ebab8347514f80d9da5a81206a087f641714#extensions/babysitter, with digest bdf2187b9a242667d34bbc63e7a744753e146dc8cd6f4047047f2aed28f406ee. A new Babysitter version requires a reviewed SDK release, and the Cloud catalog must carry that exact ref and digest.
• Default Garden bundling must prefilter the exact live babysit label before invoking this runner so unrelated PR events do not spawn sandboxes. The Cloud adapter still rechecks the live label, session, and head after dispatch.

Remaining gate

• AgentWorkforce/cloud#3942 owns persisted workspaceId/activationId/listenerAgentId injection, live open-PR/exact-label/current-head checks, authorized existing-session resolution, lineage/head dedupe, and Relay native-turn delivery.
• The Relay route, Surface release, end-to-end canary, and independent review at the exact release head remain required before replacing fix(sdk): fail closed on hosted extension dispatch #549's refusal.
• Broader per-step permissions from flows: AgentOptions has no permissions field in TypeScript, and it isn't enforced yet anywhere #442 are not bundled and remain a separate gate.

Refs #442.

Verification

• SDK typecheck/build/test-typecheck and focused security/routing suites: 10 files, 231/231 tests pass
• Surface typecheck/regressions and suite: 51/51 tests pass
• Linux sandbox exercised with bubblewrap 0.12.0 and exact published 2.0.27 bytes
• CI installs bubblewrap and explicitly enables Ubuntu user namespaces/AppArmor support so the no-network isolation suite runs rather than skips

Literal command output: evidence/babysitter-gate8-isolation/verification.txt.

---

Note

High Risk
Introduces a security-critical sandbox and parent protocol for executing pinned extension code with host-verified dispatch; mistakes in generation binding, pinning, or frame validation could allow privilege escalation or unauthorized cloud turns.

Overview
Adds a Linux-only, capability-only path to run the pinned native Babysitter extension without lifting #549’s generic executor refusal. Hosted callers must loadHostedExtensionRuntime (opaque base + installation in one generation, no extension JS import) and then runHostedCapabilityExtension, which re-verifies declarations, full project source, lock/store bytes, route uniqueness, and exact reviewed Software Factory + Babysitter ref/digest/manifest before import inside bubblewrap with a minimal Surface facade and a single capabilities.cloud.babysitterTurn.queue adapter call validated in the parent.

Supporting work hardens trust boundaries: private base/plugin snapshots with bounded descriptor reads, hosted declaration/manifest/protocol validators that treat child IPC as hostile, intrinsic-only canonical/bundle hashing so tenant code cannot poison prototypes, and build-time embedded SDK/Surface versions for standalone CLI. Docs (BABYSITTER-CATALOG-HANDOFF.md, CLOUD.md) and evidence/babysitter-gate8-isolation/ document the contract, pins, and verification record; Cloud adapter, Relay, canary, and #442 remain out of scope.

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[chatgpt-codex-connector]

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-23T01:29:38.117991Z	91aa031	Manual request

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📝 Walkthrough

Walkthrough

The PR adds typed Babysitter cloud capability contracts, isolated Linux execution for verified hosted extensions, strict artifact and protocol validation, focused tests, and documentation of the boundary and its current exclusions.

Changes

Hosted Babysitter capability isolation

Layer / File(s)	Summary
Capability contracts and public wiring packages/surface/src/cloud.ts, packages/surface/src/context.ts, packages/surface/src/index.ts, packages/sdk/src/flow-extension-loader.ts, packages/sdk/src/index.ts, extensions/babysitter/babysitter.flow.ts	Adds typed babysitterTurn.queue contracts, exposes optional cloud capabilities on Ctx, exports hosted isolation APIs, validates dispatch identity, and reads the capability through the typed context.
Artifact verification and sandbox execution packages/sdk/src/hosted-extension-isolation.ts, packages/sdk/src/hosted-extension-sandbox-source.ts	Resolves and verifies artifacts, enforces the native Babysitter manifest, runs the handler in bubblewrap with Node permissions, restricts the context, and requires exactly one validated queue call.
Isolation and compatibility validation packages/sdk/tests/hosted-extension-isolation.test.ts, packages/sdk/tests/babysitter-native-extension.test.ts, packages/sdk/tsconfig.tests.json	Tests successful receipts, denied host access, provenance checks, permission rejection, protocol failures, exact call counts, and incompatible runtime behavior.
Boundary documentation and verification evidence docs/BABYSITTER-CATALOG-HANDOFF.md, docs/CLOUD.md, evidence/babysitter-gate8-isolation/README.md, evidence/babysitter-gate8-isolation/verification.txt	Documents the Linux-only prerequisite, fail-closed behavior, hosted-dispatch exclusions, delegated Cloud responsibilities, and recorded verification results.

Priority: ➖ Normal

Estimated code review effort: 4 (Complex) | ~45 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant HostedCaller
  participant SDKIsolation
  participant LinuxSandbox
  participant CapabilityAdapter
  HostedCaller->>SDKIsolation: load flow without extensions
  HostedCaller->>SDKIsolation: resolve hosted artifacts
  SDKIsolation->>LinuxSandbox: verify artifact and start isolated handler
  LinuxSandbox->>CapabilityAdapter: queue normalized delivery
  CapabilityAdapter-->>LinuxSandbox: queued or duplicate receipt
  LinuxSandbox-->>SDKIsolation: validated completion
  SDKIsolation-->>HostedCaller: success result

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Suggested reviewers: agentrelaybot, miyaontherelay

Merge Risk: 🔵 Low · up to 16828

Some supported environments may report an unclear sandbox failure or fail the SDK test suite when bubblewrap prerequisites are absent. These bounded issues should be corrected before broad use.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 15.38% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 26 functions across 10 files. (5 skipped:…	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly and concisely describes the main change: isolating hosted Babysitter capability execution in the SDK.
Description check	✅ Passed	The description directly explains the Linux-only hosted extension runner, its isolation boundaries, capability restrictions, verification, and out-of-scope deployment work.

Full details: Docstring Coverage

Explanation

Docstring coverage is 15.38% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 26 functions across 10 files. (5 skipped: 5 unsupported.)

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Actionable comments posted: 2

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Inline comments:
In `@packages/sdk/src/hosted-extension-isolation.ts`:
- Around line 122-123: Before launching the child in the hosted extension
isolation flow, validate the current runtime when options.nodePath is undefined
and reject unsupported Node versions. Add a supportsSandboxFlags helper beside
executable that accepts Node 22.13+, 23.5+, and 24+, then return the existing
unsupported result with a clear runtime/version message when validation fails.

In `@packages/sdk/tests/hosted-extension-isolation.test.ts`:
- Line 77: Guard each test invoking runHostedCapabilityExtension with it.skipIf
based on Linux and /usr/bin/bwrap availability, adding the required existsSync
import and sandboxAvailable check. Keep the artifact-resolution test
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the user namespaces required by --unshare-all.

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📒 Files selected for processing (15)

• docs/BABYSITTER-CATALOG-HANDOFF.md
• docs/CLOUD.md
• evidence/babysitter-gate8-isolation/README.md
• evidence/babysitter-gate8-isolation/verification.txt
• extensions/babysitter/babysitter.flow.ts
• packages/sdk/src/flow-extension-loader.ts
• packages/sdk/src/hosted-extension-isolation.ts
• packages/sdk/src/hosted-extension-sandbox-source.ts
• packages/sdk/src/index.ts
• packages/sdk/tests/babysitter-native-extension.test.ts
• packages/sdk/tests/hosted-extension-isolation.test.ts
• packages/sdk/tsconfig.tests.json
• packages/surface/src/cloud.ts
• packages/surface/src/context.ts
• packages/surface/src/index.ts

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[khaliqgant]

Updated head 72667b38 addresses the first security review.

Key changes: lock-backed installation and actual extensions: none base are opaque WeakSet authorities; full installed route ambiguity is checked; exact d3ee3b5 artifact pin is enforced; public verified-dispatch factory is exported; typed adapter errors stay in the parent; protocol/sandbox are split below 500 lines; CI installs bubblewrap; evidence is literal output. The committed Babysitter 0.2.0 bytes are unchanged, and #549 remains unchanged.

Deterministic regressions cover the reported FD3 case: descriptor 3 is treated as hostile transport. A direct exact frame can consume only the already-granted one-shot delivery call, while malformed/extra requests invoke the adapter zero times and premature/repeated completion fails.

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[cursor]

Stale Bugbot comment from a previous run.

[kjgbot]

Independent review of Flows #552 at 72667b3: conditional NO-GO until Linux artifact CI completes and one deterministic hostile-child protocol gap is repaired. In hosted-extension-protocol.ts:100-146, after the child sends a valid capability frame, it can send an immediate type:error frame while the Cloud invoke promise is pending. The host settles generic plugin_unsupported and kills the child; when the adapter later returns a typed refusal or a successful side effect, the settled guard ignores that outcome. Existing tests cover premature result and normal typed refusal, not premature error. This is not a demonstrated privilege escalation with the current immutable pin, but it loses authoritative queue outcome and could cause an unsafe retry when future hosted dispatch is wired. Please defer the child error until the pending adapter call settles, preserve the typed refusal or in-doubt/success result, and add deterministic delayed-adapter regressions for both late reject and late success. Previous FD3/result, artifact, overlap, bubblewrap, public API and 2.0.26 issues appear addressed at this head, subject to exact-head CI. Keep the extension disabled under the #549 refusal boundary.

[khaliqgant]

Updated head 28d9c45d closes the remaining pending-child-error gap and repairs Linux namespace CI.

The parent now defers any hostile child terminal error while the one permitted adapter invocation is pending. A late typed Cloud rejection remains the authoritative rejection; a late success is observed before the child error settles the step; an in-doubt timeout still fails closed. Import-time FD3 regressions cover mismatched PR/delivery/event (0 calls), result-before-capability (0 calls), two calls (at most 1), and delayed reject/success.

The GitHub Ubuntu job keeps --unshare-all/no network and explicitly enables the user-namespace/AppArmor kernel prerequisite that previously caused RTM_NEWADDR; it does not use --share-net or skip the isolation tests. Local gate suite: 4 files, 147/147 tests. CI is running.

@codex security review

[kjgbot]

Independent exact-head review of Flows #552 at 28d9c45: the premature child-error protocol race is fixed and covered by raw-FD3 late-reject and late-success regressions, but the PR remains NO-GO on an unpaired-authority P1. The runner accepts an installation authority and a base authority that are independently WeakSet-branded, checking name/version but not common project/root identity. A trusted multi-tenant host can pair installation A with same-name base B even if B never declared that extension. Existing tests reject fake authorities, not two genuine authorities from different roots. See inline #552 (comment) . Please bind both authorities to one opaque origin or load them as one combined authority, and add a cross-project A/B regression. No direct current remote exploit is demonstrated because #549 keeps hosted dispatch unwired. The revised Linux CI has only passed sandbox installation so far; full SDK/artifact proof remains pending.

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[khaliqgant]

Updated head 818957fb closes the cross-project authority-pairing gap. Base and installation loader results are now privately bound to the canonical real path of the same exact flow file; independently branded A/B values fail before import with zero capability calls. A regression uses two separate projects with identical Software Factory identities to prove the refusal.

The preceding exact head 28d9c45d completed the repaired Linux artifact job green, including the real no-network bubblewrap isolation suite. Exact-head CI is running again. Local focused gate remains 4 files, 147/147 tests.

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[kjgbot]

Independent exact-head review of Flows #552 at 818957f: cross-project installation/base pairing is fixed with shared realpath origin and a genuine A/B regression; premature child-error handling remains fixed. NO-GO on a new typed-refusal loss. In hosted-extension-protocol.ts:124-129, when the Cloud adapter rejects, the host records capabilityError but waits for the child to consume stdin or emit an error. A hostile child can send one valid capability request and then hang. At timeout the failed state returns generic plugin_unsupported instead of the authoritative typed Cloud refusal. See inline P1 #552 (comment) . Add a raw-FD3 child-hang regression with delayed typed adapter rejection and zero second calls; settle promptly from the adapter or preserve its typed error at timeout. This matters for refusal versus retry routing. Three review threads are still open, and exact-head Linux artifact CI was still running at review time. #549 keeps hosted dispatch disabled, so no live remote exploit is claimed.

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[khaliqgant]

Updated head e52bbb0b preserves authoritative adapter rejection even when the hostile child hangs after its raw capability frame. Adapter rejection now settles immediately with the original typed error; the sandbox timeout cannot mask it. The deterministic regression synchronizes on adapter invocation, delays rejection, proves object identity, and proves exactly one call.

Local gate: typecheck, build, test-typecheck, and 4 security/routing files — 148/148 tests. Exact-head Linux CI and fresh security review are running. #549 remains unchanged and nothing is enabled or merged.

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[kjgbot]

Independent exact-head security review of Flows #552 at e52bbb0: the typed Cloud refusal now survives a hanging child and has a raw-FD3 regression, but whole-PR NO-GO on a verified-bytes-to-executed-bytes race. verifiedManifest rehashes the mutable project .flows/plugins directory, then runHostedExtensionSandbox resolves and read-only bind-mounts that live directory later. Plugin files remain host-writable, and a same-host writer can replace an entry or directory after verification but before import; read-only bind protects the sandbox side, not the host source. The authority still reports the pinned digest for different executed bytes. See inline P1 #552 (comment) . Please materialize a private immutable snapshot from verified content, rehash that snapshot before binding, and add a deterministic post-verification mutation regression proving the old verified bytes execute or the run refuses. Four review threads are open; exact-head Linux artifact CI is still running. Keep #549 hosted refusal in force.

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[khaliqgant]

Updated head 882e7c75 closes the verified-bytes TOCTOU. The parent now copies verified stored files into a private runtime snapshot, recomputes the snapshot digest, requires exact equality, and mounts only that snapshot. The live project store is never mounted.

The deterministic regression wraps bubblewrap, atomically replaces the entire live artifact directory after snapshot creation and immediately before launch, then proves the original reviewed handler—not the hostile replacement—executes exactly once. Local gate: 4 files, 149/149 tests.

Typed-refusal and shared-origin fixes remain intact. Exact-head Linux CI and security review are running; #549 remains unchanged and the extension remains disabled.

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[kjgbot]

Independent whole-PR review of Flows #552 at 882e7c7: the mutable live-store TOCTOU is repaired for the intended project-writer threat model by rehashing copied bytes, materializing a private snapshot, rechecking its digest, and bind-mounting that snapshot. The atomic live-store replacement regression confirms original bytes execute. NO-GO remains on a distinct stale-generation authority P1: installation and base authorities are paired by canonical flow path string only. A deployment can replace the flow/config at that same path; cached old installation A and freshly loaded base B then compare equal, allowing B to execute A extension even after B removed its declaration. See inline #552 (comment) . Bind both authorities to a shared opaque deployment snapshot/generation and add a same-path redeploy A/B regression. Also split or justify the 553-line isolation test module under the repo ~500-line reviewability standard (#552 (comment)). Exact-head Linux artifact CI remains in progress; #549 hosted refusal remains active.

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Delightful!

Reviewed commit: 882e7c757a

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[kjgbot]

Follow-up acceptance detail for the existing stale-generation P1 at head 882e7c7: test both (1) cached old installation plus a fresh base at the same path and (2) cached old installation plus cached old base on a fresh dispatch after redeploy removes the extension declaration. Rechecking stored bytes alone does not re-run declaration reconciliation. Also account for Node module caching: importing the same file URL after same-path replacement may return the old base graph, so generation proof must bind to the module actually imported. Exact-head Linux artifact CI also failed because the hostile-child typed-adapter-rejection test exceeded the default 5000 ms timeout (job 106757707719). This extends the existing NO-GO; it is not a separate finding.

[khaliqgant]

Updated head e3a69900 closes the stale-generation authority gap and the reviewability finding. The public entry point now loads base plus installation as one private generation, forces a fresh root flow import, and rechecks current extension declarations and the imported graph on every dispatch. The same-path redeploy regression proves both cached-installation/fresh-base and cached-installation/cached-base pairings fail with zero adapter calls after the declaration is removed. Hostile protocol cases are split into a 195-line suite; all affected modules are below 500 lines. Local exact gate: typecheck, build, test-typecheck, 5 files and 151/151 tests. Exact-head CI is running. #549 remains unchanged; nothing is enabled, published, or merged.\n\n@codex security review

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[kjgbot]

Fresh independent exact-head review of e3a6990: the prior cached old-installation plus fresh/old base revocation cases now reject correctly, and the test module is split. NO-GO remains on four items. (1) hosted-extension-runtime.ts 209-214 imports the base before hashing file paths; a replacement between import and hash can label old executed bytes with the new disk digest (Bugbot r4072237577). (2) authored-flow-loader.ts 105-156 hashes root and header.use flow nodes but omits ordinary relative helper imports; a cached runtime can survive helper edits and a fresh direct-flow nonce can still import a cached helper. Bind generation to the complete graph actually executed. (3) hosted-extension-protocol.test.ts is missing from tsconfig.tests.json and is not test-typechecked (Bugbot r4072237587). (4) The moved hostile-child test still uses timeoutMs 100 then waits without a bound for invoked; cold bubblewrap startup can kill the child before its capability frame, repeating the prior Linux 5000 ms failure. Please add deterministic regressions, include the test in typecheck, bound the startup case, and rerun exact-head Linux CI before fresh review.

[khaliqgant]

Updated head 6deb5d49 replaces post-import hashing and URL cache busting with an immutable base-source snapshot. The parent buffers the complete in-project source tree, materializes and rehashes it privately, imports the base and ordinary relative helpers only from that unique snapshot, then requires the live tree to remain identical before returning authority and again before each dispatch. Deterministic regressions cover a helper-only same-path redeploy and live helper mutation during import. The split protocol suite is now in tsconfig.tests.json; its hostile-child startup wait is explicitly bounded without a 100ms cold-start race. Local exact gate: typecheck, build, test-typecheck, 5 files and 152/152 tests. The preceding exact head completed the full Linux artifact/bubblewrap job green; new exact-head CI is running. #549 remains unchanged and nothing is enabled or merged.\n\n@codex security review

[kjgbot]

Correction to the earlier conditional review: independent exact-head audit of 6deb5d4 is NO-GO under the stated project-writer threat model. hosted-base-snapshot.ts 11,53-61,90-117 excludes node_modules from the generation digest but symlinks snapshot node_modules to the live project directory. authored-flow-loader.ts 180-206 then imports arbitrary ESM dependencies through that live path, while hosted-extension-runtime.ts 185-197 rechecks only the excluded-source view. A base importing local-identity can execute altered node_modules/local-identity/index.js bytes after snapshot/digest without changing the attested source or lockfile. Please add a deterministic mutation-during-import and after-load regression that refuses, then either snapshot/hash dependency bytes actually executed or prove an immutable host-owned integrity-pinned dependency boundary. The current handoff claim that mutable deployment paths cannot substitute identity is not established by this head. Exact-head CI success would not resolve this trust-boundary gap.

[cursor]

Cursor Bugbot has reviewed your changes using high effort and found 2 potential issues.

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[cursor]

Lock names escape plugin store path

Medium Severity

The hosted lock parser never requires name to be a single safe path component, but installationAt still joins that string into the plugin-store directory. A lock name containing .. or / resolves pluginStoreDirectory outside .flows/plugins, so generation load will open/read an attacker-chosen @sha256: path before the Babysitter pin runs.

Additional Locations (2)

• packages/sdk/src/hosted-extension-runtime.ts#L180-L182
• packages/sdk/src/plugin-store.ts#L77-L80

 

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[cursor]

Base compat match uses last entry

Low Severity

assertBaseCompatible now keeps the last compat.base entry with a matching name instead of the first. The previous .find() used first-match, so duplicate names with different version ranges can now accept or refuse the opposite range on the shared compose and hosted paths.

 

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