fix(sdk): populate f.agent artifacts instead of hardcoding [] - #434
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`AgentResult.artifacts` from an authored TS `f.agent()` step was always `[]`, so any `.gate((r) => r.artifacts.includes(...))` — the pattern `examples/social-post-pipeline/social-post-pipeline.flow.ts` itself uses to require a real file write, not just chat prose — could never pass. Add `agent-artifacts.ts`: a recursive, content-hash (size + sha256, not mtime) snapshot/diff of a directory, mirroring the same rule `examples/research/shims/agent-cli.ts`'s `snapshot()` already uses for "did the agent actually write something", extended to nested paths since the social-post-pipeline gates expect paths like `research/notes.md`. `authored-worker-step.ts`'s `agent()` now snapshots `options.cwd ?? process.cwd()` before the step and diffs after, returning the changed paths as `artifacts`. This only runs on the local-agent path (`localAgentStream !== undefined`): that's the only worker attachment that executes in this same process/filesystem, so the cwd is provably where the CLI wrote. Any other attachment could be on a different host entirely, so `artifacts` stays `[]` there rather than guessing. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01YcQh7UEGp1k8TzBH8aiZsu
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📝 WalkthroughWalkthroughThe SDK adds utilities to snapshot workspace files and detect changed paths. Authored local-agent runs now return detected artifacts. Unit and integration tests cover file changes, exclusions, missing workspaces, and runs without local agents. ChangesWorkspace artifact reporting
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant authoredWorkerRunner
participant LocalAgentWorkspace
participant AgentResult
authoredWorkerRunner->>LocalAgentWorkspace: snapshot before local agent run
authoredWorkerRunner->>LocalAgentWorkspace: run agent and snapshot after execution
authoredWorkerRunner->>AgentResult: return changed paths in artifacts
Merge Risk: 🟡 Moderate · up to Permission or other workspace I/O failures can silently omit files from local-agent artifact results. Surface those failures before merging so reported artifacts remain trustworthy. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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Inline comments:
In `@packages/sdk/src/agent-artifacts.ts`:
- Around line 29-30: Update snapshotWorkspaceFiles so its readdir, stat, and
readFile error handlers ignore only ENOENT; rethrow every other filesystem
error, including EACCES, ENOTDIR, and EISDIR, so scan failures reach the caller
while missing paths remain omitted.
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packages/sdk/src/agent-artifacts.tspackages/sdk/src/authored-worker-step.tspackages/sdk/tests/agent-artifacts.test.tspackages/sdk/tests/authored-agent-artifacts.test.ts
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Cursor Bugbot: a step with transport: 'relay' still got a local before/after snapshot even though relay execution happens on a remote host, so the diff was never actually where the CLI wrote. Excluded transport === 'relay' from artifactRoot alongside the existing !localAgentStream / workspace-scoped exclusions. CodeRabbit: snapshotWorkspaceFiles caught every readdir/stat/readFile error (EACCES, ENOTDIR, EISDIR, ...) and silently treated the file as absent, so a real I/O failure could produce an incomplete artifacts list that still reported success. Now only ENOENT is swallowed; every other error propagates out of the step instead of being reported as truth. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01YcQh7UEGp1k8TzBH8aiZsu
This was referenced Sep 17, 2026
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Keeps the worker-side artifact journaling over #434's step-side snapshot (both landed on main meanwhile) and main's f.agent permissions option. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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…redicate gates (#449) * feat(sdk,surface): journaled agent artifacts, artifact_exists gate, predicate gates Three pieces that together make "the agent must have written this file" a journal-honest, replayable check for authored flows. Artifacts move into the worker. #434 measured them in the authored step, after the journal entry was written, so a gate could not read them and a resume could not reproduce them. `runAgentCli` (the process that spawns the CLI in its cwd) now snapshots that directory before the spawn and content- diffs it after, and `WorkerCliResult.artifacts` rides in the step's journaled `output` on the CliResult path. `AgentResult.artifacts` is read from that entry — no second scan, no guess about which host wrote what. Relay transport journals none (the agent ran elsewhere); an agent whose final message is a JSON object owns its output shape, which is left untouched, so such a step journals no artifacts either (documented; gate those on a deterministic check). `agent-artifacts.ts` and its unit tests are kept as-is. `artifact_exists` named gate: `{ type: 'artifact_exists', path }` end to end — surface `NamedGate`, SDK `NamedDataGate`, validation (`gate_path_invalid`: relative POSIX path, no empty/./.. segments, no NUL), lowering to a deterministic `<step>.gate` step whose command judges only `input.output.artifacts` from FLOWS_INPUT, `unknown_gate_kind` message, preflight refusal coverage, regenerated JSON schema. Predicate gates: `.gate(fn, because?)` was refused as `unsupported_gate` although SURFACE.md §6 specified running it as runtime control flow. The executor now runs the closure once, after the step, on the journaled value, and journals the verdict as a lowered `<step>.gate` deterministic step (`{"gate":"predicate","step","verdict","because"}`; exit 0/1), so resume and replay read the recorded verdict and never re-run author code. A false or throwing predicate fails the run as `gate_failed` naming the step and the reason; `flows run`/`resume` report it as a run failure, not a protocol one. One `.gate()` per step. The function is never serialized; `flows check` prints no gate line for it (runtime-only, by construction — documented). Tests: worker artifacts through a mocked spawn; gate validation, lowering (command exercised against FLOWS_INPUT), `flows check` inspection; #434's loopback integration adapted to the journaled contract; and a live test that invokes the built CLI with Cloud's exact argv (`run --json --data-dir … --local-agent x.flow.ts --input …`) against a real daemon and a wrapper CLI that writes `review/*.md`, asserting `output.artifacts` in the journal, both gate forms passing, and both negative cases failing the run with the gate named. Examples: pr-review-pipeline uses `artifact_exists` per lens and a predicate for consensus; examples/README no longer calls it BLOCKED on the budget header (accepted since #306). Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> * fix(sdk): apply predicate gates to every operation, record verdicts for resume, isolate artifact intervals, run wrappers in cwd Review round on #449 (Cursor, Devin), each addressed: - A predicate accepted on a helper/MCP/plugin Step was stored and never evaluated. The applier now lives on the lifecycle and runs in `AuthoredFlowOperation.begin` for every operation kind; a runtime without an applier refuses the gate instead of skipping it. - On resume the closure re-ran and could change the gate step's spec under its admission key. The verdict is now appended to the root run's `predicate-gates` stream before the gate run opens; a resumed body finds the recorded verdict for that step and reuses it, never re-running author code, so the gate spec is identical. - Two agents in one cwd with worker capacity > 1 could attribute each other's writes. The snapshot-spawn-snapshot interval is now serialized per canonical working directory. - Wrapper sessions spawned in the worker's process directory while the scanner measured the requested `cwd`. `cwd` is threaded through `runWrapperSession`/`executePinnedWrapper` to the spawn. Tests: helper-step predicate failing the run; `predicate-gates` stream record read back from the root run; capacity-2 overlap attributing the write to the agent that made it; a real wrapper measured in the requested cwd. (`f.agent({ cwd })` is refused by the kernel spec today — unknown field — so that last one is a worker-level test.) Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> * fix(sdk): share one predicate-verdict stream load across concurrent gates on resume `recordedVerdict` assigned an empty map before its `stream.read` resolved, so a second `.gate(fn)` in flight at the same time (Promise.all) saw the map as empty, re-ran its closure and appended a second record — and a different verdict would have changed the lowered gate command under its existing admission key. The in-flight load promise is now what is memoized; every concurrent gate awaits the same read. Test: two parallel gates on a resumed root with slow-answered recorded verdicts — closures never called, nothing appended, both gate specs carry the recorded pass; red on the previous source, green now. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> * fix(sdk): standalone result verifier accepts gate children — predicate `<step>.gate` runs and lowered named-gate steps The Bun/Node standalone verifier (`verifyAuthoredNodeResult`) required `journalSteps.length === N` from `complete-N` and every id to end in `-<n>`, so a predicate-gated flow — whose gate is journaled as its own `<step>.gate` child run — was refused as having no durable completion and the root terminalized `worker_error`. Missed locally because the Bun suite was skipped (Bun 1.3.14 vs pinned 1.4.0). Decision, per SURFACE.md §6: a gate is subordinate to the step it judges. A named gate lowers to `<step>.gate` INSIDE the step's spec and has never consumed an ordinal; the predicate gate keeps the same `<step>.gate` shape as a separate run only because the closure must run between the step's completion and the gate's. `complete-N` counts the operations the author wrote, so `.gate` ids are set aside from the count and contiguity check — not exempted from verification: every gate must name a claimed parent, cannot be the terminal, and is held to the same durable completion evidence as any other child (completed run, `done` state, `step.completed` success, spec named `<flow>/<id>`). While running the suite under a real Bun 1.4.0, a second pre-existing gap in the same verifier surfaced: it assumed one step per child spec, but a NAMED gate lowers a second `<id>.gate` step into that spec, so any named-gated authored step was refused too. The verifier now accepts `[step, step.gate]` and requires the gate step to have completed. Tests: unit (no Bun) — predicate gate accepted and verified; orphan gate, non-success gate, gate without durable completion, gate as terminal, and a count that includes gates all refused; named-gate spec shape accepted with a completed gate and refused otherwise or with a foreign second step. Runtime — new `authored-node-runtime` case runs a predicate-gated + named-gated flow through the standalone CLI and resumes it; the whole Bun suite passes under Bun 1.4.0 (`FLOWS_BUILD_BUN`). Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> --------- Co-authored-by: Relayflow Lead <lead@relayflows.local> Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Summary
authored-worker-step.ts'sagent()always returnedAgentResult.artifacts: [], so any flow gating on.gate((r) => r.artifacts.includes(...))— including this repo's ownexamples/social-post-pipeline/social-post-pipeline.flow.ts— could never pass, regardless of what the agent actually wrote to disk. Confirmed only one commit had ever touchedartifactsin that file (its original introduction).packages/sdk/src/agent-artifacts.ts: a recursive, content-hash (size + sha256, not mtime) snapshot/diff of a directory, skippingnode_modulesand dotfiles/dotdirs (.git, the kernel's own.relayflowddata dir). Mirrors the existing convention inexamples/research/shims/agent-cli.ts'ssnapshot(), extended to nested paths sincesocial-post-pipeline.flow.ts's gates expect paths likeresearch/notes.md.agent()now snapshotsoptions.cwd ?? process.cwd()before the step and diffs after, returning the real changed paths asartifacts.localAgentStream !== undefined): that's the only worker attachment that runs in the same process/filesystem as the authoring code, so the cwd is provably where the CLI wrote. Any other attachment (a remote/relay worker) could be on a different host entirely, soartifactsstays[]there rather than guessing — this is intentional, not a shortcut.Test plan
snapshotWorkspaceFiles/diffWorkspaceFiles(nested write, same-size content change, no-op,node_modules/dotdir skipping, missing dir)executeAuthoredFlow(fake-loopback-journal harness) provingartifactspopulates on the local-agent path and stays[]without onetsc --noEmitclean onpackages/sdkandpackages/surfacepackages/sdkvitest suite: 1586 passed / 60 failed, all 60 failing onENOENT relayflowd(this environment has no built Rust kernel binary) — identical failure set with and without this change, confirmed by reverting and re-running🤖 Generated with Claude Code
https://claude.ai/code/session_01YcQh7UEGp1k8TzBH8aiZsu
Note
Medium Risk
Changes authored-flow step results and filesystem I/O on every local direct agent step; behavior is scoped but affects gate logic that depends on
artifacts.Overview
f.agent()no longer always returnsartifacts: []. On the local-agent direct path, the worker snapshotsoptions.cwd(orprocess.cwd()) before the step and diffs after execution, returning sorted paths for new or content-changed files (size + SHA-256, not mtime). Dotfiles/dotdirs andnode_modulesare excluded; missing cwd yields an empty snapshot; non-ENOENTscan errors still fail the step.Relay transport and runs without a local agent stream keep
artifacts: []so the SDK does not infer remote filesystem writes from the authoring process.New
agent-artifactshelpers and unit/integration tests cover nested paths, same-size edits, skip rules, and the local vs relay vs no-local-agent behavior—unblocking flows that gate onresult.artifacts(e.g. paths likeresearch/notes.md).Reviewed by Cursor Bugbot for commit 8f3a45e. Bugbot is set up for automated code reviews on this repo. Configure here.
Summary by cubic
Fixes
f.agent()steps in authored flows always returningartifacts: [], so gates like.gate((r) => r.artifacts.includes(...))can now pass when the agent writes files. The step snapshots its working directory before running and reports changed paths asartifacts; detection runs only on the local-agentdirecttransport path, sincerelayand other worker attachments may execute on a different host and keep returning[].node_modulesand dotfiles/dotdirs (.git,.relayflowd) are skipped.ENOENTerrors are swallowed; any other filesystem error propagates instead of silently producing an incompleteartifactslist.examples/social-post-pipeline, whose gates expect paths likeresearch/notes.mdinartifacts.packages/sdkvitest run: 1586 passed / 60 failed, all 60 from a missing Rust kernel binary (ENOENT relayflowd) — the same set fails without this change.Written for commit 8f3a45e. Summary will update on new commits.