feat(agent): carry a harness transcript from the outcome to the observer - #75
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`TranscriptEntry` is engine surface, not storage. The next commit hangs one on `AgentRunOutcome` and on `ExecutionStep` — both compiled in every build — so the type cannot sit behind `store`, a feature the engine never depends on and most hosts never enable. A pure move plus a re-export: `store::types::TranscriptEntry` still resolves, so `RunStep.transcript` and every existing path are untouched. The module is serde-only with no dependencies, so this costs the kernel profile nothing. Its docs are rewritten on the way, because the division of labour they describe is now visible in the type system rather than only in prose: the engine carries entries, and the host — the only thing with an event stream, and the only thing that knows what counts as one entry — folds them. Co-authored-by: Medulla <medulla@tinyhumans.ai>
An `agent` node runs a host's harness, and a harness has an event stream: it
thinks, calls a tool, reads the result, thinks again. The node's output says
what came *out* of that. Nothing said what happened *inside* it, so a run could
be read as pass/fail and nothing more — and a host that had captured a
transcript had no channel to hand one over.
Four small additions, one path:
AgentRunner::run -> AgentRunOutcome.transcript
-> NodeOutput.transcript
-> ExecutionStep.transcript (RunObserver::on_step_finish)
-> RunObserver::on_agent_event (live, per entry)
`on_agent_event` is not redundant with the step. A step's transcript arrives
when the node *finishes*, and an agent node can run for minutes; a host that
wants to show what an agent is doing while it does it needs the entries as they
happen. Both paths carry the same entries on purpose, so neither is the only
source: one drives a live view, the other survives to a run read back tomorrow.
Two details worth reviewing:
- A `per_item` agent node runs one turn per input item and reports ONE step, so
entries accumulate in a shared sink rather than being returned per turn —
otherwise every turn but the last would be dropped.
- A tool call closing an open thinking run emits that run's finalized reasoning
*before* the tool's own step. Dropping the tail would lose the reasoning
immediately preceding a tool call, which is the part worth reading.
Non-breaking by construction, and pinned by a test: a host that overrides
neither hook behaves exactly as it did. `MockAgentRunner` implements only the
legacy `run_agent`, so the default `run` wraps its return in a `finished`
outcome with an empty transcript — `a_legacy_host_reports_no_transcript` asserts
that path still works and simply has nothing to say.
`ExecutionStep` gains a field, so its literals are updated rather than the
struct being made `#[non_exhaustive]` — hosts construct these in their own
tests, and closing the struct would take that away to save touching nine lines.
Co-authored-by: Medulla <medulla@tinyhumans.ai>
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Important Approval pendingCodeRabbit has no unresolved comments, but it could not review the latest commit because the review limit was reached. Follow the review guidance in this comment to continue. 📝 WalkthroughWalkthroughThe change moves agent outcomes into a dedicated module and adds settled transcript propagation. Agent transcripts now flow through node outputs and execution steps, then persist in adaptive wire records and SQLite or Mongo ledgers. ChangesAgent transcript propagation
Estimated code review effort: 4 (Complex) | ~60 minutes Merge Risk: 🟠 High · up to The PR can persist large harness transcripts in MongoDB step documents without a total-size bound, so sufficiently long runs may exceed MongoDB's 16 MiB limit and leave step history truncated or missing during replacement. Merge should wait for bounded, atomic transcript persistence or explicit owner acceptance; the per-item ordering test also needs a discriminating assertion. Sequence Diagram(s)sequenceDiagram
participant AgentRunner
participant AgentNode
participant ExecutionStep
participant StepRecord
participant Ledger
AgentRunner-->>AgentNode: AgentRunOutcome with transcript
AgentNode->>ExecutionStep: attach settled transcript
ExecutionStep->>StepRecord: copy transcript
StepRecord->>Ledger: serialize and save transcript
Ledger-->>StepRecord: restore transcript
Suggested reviewers: Poem
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches📝 Generate docstrings
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How this change flows5 changed behaviours across 4 relationships. 1 surrounding behaviour is shown (60 graph nodes walked). 31 further behaviours left out to keep the diagram readable. flowchart LR
n0["RunReport<br/>changed"]:::changed
n1["StepRecord<br/>changed"]:::changed
n2["run_transcripts<br/>changed"]:::changed
n3["MongoLedger<br/>changed"]:::changed
n4["SqliteLedger<br/>changed"]:::changed
n5["Ledger"]:::impacted
n0 -->|uses| n1
n2 -->|uses| n5
n3 -->|implements| n5
n4 -->|implements| n5
classDef changed fill:#0d4429,stroke:#238636,color:#e6edf3
classDef impacted fill:#161b22,stroke:#6e7681,color:#c9d1d9
classDef flagged fill:#5a1e02,stroke:#d93f0b,color:#ffffff
classDef blocking fill:#67060c,stroke:#f85149,color:#ffffff
Green: changed behaviour. Grey: surrounding behaviour. Arrows name the call, use, implementation, or test relationship. Orange: has findings. Red: has a finding that blocks the merge. |
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| // Before the stop reason is judged, so a run that paused or hit a limit | ||
| // still explains what it managed to do — that is exactly the run whose | ||
| // transcript is worth reading. | ||
| record_transcript(ctx, transcript, outcome.transcript); |
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When the harness returns StopReason::Paused (or output parsing subsequently fails), this records entries into the activation-local sink and then finish_agent_run returns an error before execute reaches drain. The engine therefore creates an error ExecutionStep with an empty transcript, so the paused run highlighted as especially worth explaining cannot be recovered from the settled run record; the error path must carry the collected transcript into the error step.
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This one is right and I have not fixed it — flagging rather than quietly closing.
You've identified the sharpest case: StopReason::Paused is turned into an Err by finish_agent_run, so execute never reaches drain, and the engine builds its error ExecutionStep with an empty transcript. A paused run is precisely the one whose transcript is worth reading — my own mock says so in a comment — and today it is the one that loses it.
I did not fix it because the error path has nowhere to put one: execute returns Result<NodeOutput>, so on the Err arm there is no output to carry a transcript on, and the error step in engine/build/outcome.rs is constructed without access to the activation's sink. Closing it means giving the engine's error path a channel for activation-local data — a real design change, and I would rather not improvise one under review.
For now it is named in AgentRunOutcome::transcript's docs as a known gap, so it is discoverable rather than surprising.
Two shapes I can see, if you have a preference:
- Put the sink on
NodeContextso the error arm inoutcome.rscan read it — smallest change, but widensNodeContextfor one node kind. - Let a node return partial data alongside an error — a much bigger contract change, but it would also serve
on_errorpolicies.
Happy to do either here or as a follow-up.
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Inline comments:
In `@src/nodes/integration/agent.rs`:
- Around line 27-44: Move transcript publication from record_transcript into the
AgentRunner execution path so each harness-emitted entry is immediately sent to
RunObserver::on_agent_event and appended to the settled accumulator before
AgentRunner::run completes. Add the required event sink to the AgentRunner
capability contract, while retaining AgentRunOutcome::transcript for the final
settled transcript; remove the post-run callback-based publication from
record_transcript.
In `@src/transcript.rs`:
- Around line 33-42: Update TranscriptEntry::bounded so the complete stored
text, including the " …[truncated]" marker, never exceeds MAX_ENTRY_TEXT_BYTES;
reserve the marker’s byte length before selecting the final valid UTF-8
boundary, while leaving untruncated text unchanged.
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src/caps/agent.rssrc/caps/mock.rssrc/diagnostics_tests.rssrc/engine/build/outcome.rssrc/lib.rssrc/nodes/execution.rssrc/nodes/integration/agent.rssrc/nodes/integration/agent_tests/agent_tests_part_02_tests.rssrc/observability.rssrc/observability_tests.rssrc/store/types/mod.rssrc/transcript.rs
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`crates/adaptive` is a workspace member that builds an `ExecutionStep` in two places, and CI builds with `--workspace` where my local `cargo test` did not — so this only surfaced on the PR. `StepRecord::to_step` gets an empty transcript rather than a transported one, which is honest rather than lossy by accident: that type is a budget-bounded wire form that already clips `output` and narrows `duration_ms` from `u128`, and a transcript is many entries that would dwarf the budget the rest of it is held to. Nothing downstream reads it — `to_step` exists so `diagnose` can read a step on the far side, and diagnosis is a function of status, output and null bindings. Co-authored-by: Medulla <medulla@tinyhumans.ai>
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Review found that `on_agent_event` was not live, and it was right. The transcript rides the outcome `AgentRunner::run` returns, so the hook could only fire once the whole agent turn was over — in a burst, at the same moment `on_step_finish` gets the same entries. For the long-running node it was justified by, it published nothing until there was nothing left to publish. Removing it rather than patching the docs. Genuine live delivery needs a sink on the capability contract, and `AgentRunRequest` cannot carry one — it is `Serialize` + `PartialEq` — so it wants a new trait method designed on purpose, not a hook that already promises something it cannot do. Its only consumer does not implement it, so nothing is lost today and the API stops lying. Also from review: - Per-item transcripts are keyed by item index and drained in that order. `map_items` restores outputs to input order; appending on completion let a `concurrency > 1` run interleave differently from the next for identical input. - `TranscriptEntry::bounded` charges the truncation marker against `MAX_ENTRY_TEXT_BYTES` instead of adding it on top, so a clipped entry actually honours the documented cap. - `AgentRunOutcome::limit_stop` and `::paused`, because those two stop reasons carry data and had no constructor — a host reporting either had to write the struct literal, which is exactly what makes adding a field source-breaking. Migration is now one line. - `agent_tests_part_02` had grown to 546 lines; the transcript tests move to part 03. `caps/agent.rs` went to 527 with the constructors, so the outcome types move to `caps/agent/outcome.rs` — the request half and the outcome half divide cleanly. One review point is acknowledged and NOT fixed: an outcome the node turns into an `Err` — today only `StopReason::Paused` — still loses its transcript, because the engine builds that error step without a `NodeOutput` to carry one. That is the run whose transcript is most worth reading. Closing it means giving the error path somewhere to put one, which is an engine-shaped change; it is named in the field's docs rather than left to be discovered. Co-authored-by: Medulla <medulla@tinyhumans.ai>
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…intra-doc links The doc comment in `src/transcript.rs` now explicitly states that transcript entries ride the outcome and reach an observer only when the node finishes, rather than implying they can be reported during a run. The previous cross-reference to `RunObserver::on_agent_event` was misleading because that method is for live reporting, not for the settled entries this module describes. In `src/caps/agent/outcome.rs`, the intra-doc links to `AgentRunRequest` and `AgentRunner` were updated to use the full path syntax so they resolve correctly in the rendered documentation. Auto-committed-on: dragonfly Co-authored-by: Medulla <medulla@tinyhumans.ai>
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@coderabbitai review Both findings from the blocking review are addressed, and your follow-ups confirm them:
Also from the Codex pass in the same round: per-item transcripts are now keyed by item index and drained in order, One thread is deliberately left open rather than resolved: a CI is green on |
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set -euo pipefail
echo '== Current commit =='
git rev-parse --short HEAD
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echo '== Callback references (should be absent) =='
rg -n -i -C2 '\bon_agent_event\b' . || true
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rg -n -C3 'MAX_ENTRY_TEXT_BYTES|StopReason::Paused|limit_stop|fn paused|struct AgentRunOutcome|with_transcript|transcript' \
src/caps src/nodes src/engine src/observability.rs src/transcript.rs 2>/dev/null || true
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for f in src/caps/agent.rs src/nodes/integration/agent.rs src/nodes/execution.rs src/engine/build/outcome.rs src/observability.rs src/transcript.rs; do
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echo '== Focused diff =='
git diff --unified=60 origin/main...HEAD -- \
src/caps/agent.rs \
src/nodes/integration/agent.rs \
src/nodes/execution.rs \
src/engine/build/outcome.rs \
src/observability.rs \
src/transcript.rs \
2>/dev/null || git diff --unified=60 HEAD~1...HEAD -- \
src/caps/agent.rs \
src/nodes/integration/agent.rs \
src/nodes/execution.rs \
src/engine/build/outcome.rs \
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crates/adaptive/src/execute/wire.rs \
src/caps/agent/outcome.rs \
src/caps/mock.rs \
src/lib.rs \
src/store/types/mod.rs \
src/store/types/transcript.rs \
src/nodes/integration/agent_tests.rs \
src/nodes/integration/agent_tests/agent_tests_part_03_tests.rs \
src/observability_tests.rs \
src/diagnostics_tests.rs
echo '== API construction and persistence references =='
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'AgentRunOutcome\s*\{|AgentRunOutcome::(finished|limit_stop|paused)|TranscriptEntry|ExecutionStep\s*\{' \
src crates/adaptive
echo '== Transcript boundary tests and paused-agent tests =='
rg -n -C6 \
'MAX_ENTRY_TEXT_BYTES|TRUNCATION_MARKER|truncat|paused|MockPaused|StopReason::Paused|transcript' \
src/*tests.rs src/caps src/nodes/integration/agent_tests src/store/types crates/adaptive 2>/dev/null || true
echo '== Relevant file outlines =='
for f in src/caps/agent/outcome.rs src/store/types/transcript.rs crates/adaptive/src/execute/wire.rs src/nodes/integration/agent_tests/agent_tests_part_03_tests.rs src/observability_tests.rs; do
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rg -n -i -C3 'semver|breaking change|public api|compatib|versioning' \
README.md CONTRIBUTING.md Cargo.toml docs crates 2>/dev/null || true
echo '== Adaptive conversion call sites =='
rg -n -C6 \
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crates/adaptive/src crates/adaptive/tests
echo '== Adaptive execute module and engine bridge =='
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README.md docs examples crates src 2>/dev/null || trueLength of output: 186734
I found one new blocking issue. P1 — Preserve transcripts across the adaptive execution wire
Add a transcript field to You are interacting with an AI system. |
…ledgers Review was right and my earlier reasoning was wrong. I had left `StepRecord::to_step` returning an empty transcript with a comment claiming the wire form is deliberately lossy — but `Ran::steps` documents itself as "every node activation, at full record fidelity. The per-node transcript: what to archive, and richer than what the judge is shown." Dropping the transcript there contradicts that field's own stated purpose, and because `report` always routes captured steps through `StepRecord::bounded`, every local and remote adaptive run was discarding an agent's transcript before `Ledger::save_steps` ever saw it. `StepRecord` now carries `transcript`; `bounded` copies it and `to_step` preserves it. Both ledgers persist it: SQLite gains a column (with the additive `ALTER TABLE` the file's `MIGRATIONS` list exists for, so an existing ledger keeps working), Mongo gains a key and reads a missing one as empty rather than as corrupt. The record budget deliberately does **not** clip it. `output` is clipped because it is one payload whose tail is the least interesting part; a transcript is many entries already bounded by `TranscriptEntry::bounded`, and cutting it mid-way loses the end of a thought rather than the tail of a value. That is asserted rather than left to the comment. Tests: a transcript round-trips through `bounded`/`to_step`; the budget clips `output` and not the transcript; a legacy record deserializes with none; an empty one still serializes byte-identically; and a ledger conformance case both backends run, which also checks a step that recorded none does not inherit the previous step's. Co-authored-by: Medulla <medulla@tinyhumans.ai>
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@coderabbitai You were right, and my earlier reasoning was wrong — thank you for pushing on it. I had left Fixed on
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| output TEXT NOT NULL, | ||
| duration_ms INTEGER NOT NULL DEFAULT 0, | ||
| null_bindings TEXT NOT NULL DEFAULT '[]', | ||
| transcript TEXT NOT NULL DEFAULT '[]', |
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This edit leaves sqlite.rs at 947 physical lines; other affected files remain oversized as well (conformance.rs at 788, closing.rs at 713, and mongo.rs at 571). The repository explicitly requires checking every affected source and test file and splitting any that exceed 500 lines, so these changes need to be reorganized before completion.
AGENTS.md reference: AGENTS.md:L3-L9
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Declining this one, with reasons rather than silently.
All four files are already over the limit on main: sqlite.rs 936, conformance.rs 753, closing.rs 712, mongo.rs 560. My change adds 11, 35, 1 and 11 lines respectively. I did not push any of them over.
Every file this PR did push over, I have split:
agent_tests_part_02_tests.rs546 → 366, transcript tests to a new part 03caps/agent.rs527 → 289, outcome types tocaps/agent/outcome.rsexecute/wire.rs→ 319 +wire_tests.rs375 (from your sibling comment)
Splitting a 947-line SQLite ledger and a 788-line conformance suite is a substantial refactor of code this PR is otherwise a guest in. It carries real regression risk in exactly the persistence layer this feature now depends on, and it would bury a reviewable feature diff under a rename-heavy one. closing.rs is the clearest case against: one added line.
I read the rule as "do not leave your own change over the limit", which is how I applied it to the three files above. If the maintainers read it as "any file the branch touches, regardless of who put it over", I will do the splits — but as a separate PR that lands first, so the refactor and the feature can be reviewed apart rather than as one diff.
Leaving this open for a maintainer to decide rather than resolving it myself.
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Inline comments:
In `@crates/adaptive/src/ledger/mongo.rs`:
- Around line 470-471: Update the step persistence flow around save_steps and
TranscriptEntry::bounded so transcripts are stored outside the step document in
bounded chunks or a related collection, avoiding MongoDB’s document-size limit.
Persist all chunks successfully before atomically replacing the existing steps,
and preserve the complete transcript without allowing failed writes to leave
only a prefix or no steps.
In `@src/nodes/integration/agent_tests/agent_tests_part_03_tests.rs`:
- Around line 152-161: Update the ordering test around the transcript assertions
to distinguish entries by input item index: configure the mock runner to
complete items in inverse order, emit item-specific transcript text or kinds,
and assert that the resulting pairs remain in original input-index order rather
than merely matching four identical kind pairs.
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📒 Files selected for processing (16)
crates/adaptive/examples/eval.rscrates/adaptive/src/execute/wire.rscrates/adaptive/src/ledger/conformance.rscrates/adaptive/src/ledger/mongo.rscrates/adaptive/src/ledger/sqlite.rscrates/adaptive/tests/closing.rscrates/adaptive/tests/continue_after_repair.rscrates/adaptive/tests/contracts_surface.rssrc/caps/agent.rssrc/caps/agent/outcome.rssrc/nodes/integration/agent.rssrc/nodes/integration/agent_tests.rssrc/nodes/integration/agent_tests/agent_tests_part_03_tests.rssrc/observability.rssrc/observability_tests.rssrc/transcript.rs
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'struct StepRecord|transcript:|fn bounded|fn to_step|ALTER TABLE|MIGRATIONS|save_steps|fn steps|legacy|round.trip|run_transcripts' \
crates/adaptive/src/execute/wire.rs \
crates/adaptive/src/ledger/sqlite.rs \
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crates/adaptive/src/execute/wire.rs \
crates/adaptive/src/ledger/sqlite.rs \
crates/adaptive/src/ledger/mongo.rs \
crates/adaptive/src/ledger/conformance.rsLength of output: 69462
SQLite persists the transcript and adds the required additive migration. Mongo persists the transcript and reads missing legacy fields as empty. The wire tests cover round trips, legacy records, empty serialization, and independent transcript sizing. The ledger conformance test verifies ordered persistence and verifies that an empty step does not inherit a prior transcript. The adaptive transcript finding is addressed. The separate ᕱ⑅ᕱ ✏️ Learnings added
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…the ordering Two more from review, both correct. **The Mongo document cap.** Carrying the transcript per step reintroduced, one level down, exactly the hazard `save_steps` already reasons about: entries are individually capped at 4 KiB, but a `per_item` node folds every item's turn into ONE step, so a few thousand of them reach the 16 MB a document may hold — and because `save_steps` deletes before it upserts, an oversized write destroys the previous record and *then* fails. Production-only, which is the worst kind. `StepRecord::bounded` now trims to `TRANSCRIPT_BUDGET`, keeping both ends with a marker entry naming how many were elided. Both ends rather than a tail clip: the start says how the agent approached the work and the end says how it concluded, and the conclusion is usually why someone opened the transcript. **The ordering test proved nothing.** It asserted four identical `[agent_thinking, agent_message]` pairs, which a completion-ordered accumulator produces just as happily. Rewritten with a runner that names its item and sleeps inversely to its index, so input order and completion order genuinely disagree. Verified by falsification: with the sink keyed by arrival instead of item index the assertion fails with a fully reversed `["item 3", "item 2", "item 1", "item 0"]`. Co-authored-by: Medulla <medulla@tinyhumans.ai>
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Both new findings were right — fixed on The Mongo 16 MB cap. You're right, and the file's own note is what makes it clear:
The ordering test proved nothing. Also right, and a good catch — four identical I verified it by falsification rather than assuming: with the sink keyed by arrival instead of item index, the assertion fails with a fully reversed Gates on |
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On the 500-line rule for All four are already over the limit on Splitting a 947-line SQLite ledger and a 788-line conformance suite is a substantial refactor of code this PR is otherwise a guest in. It carries real regression risk in exactly the persistence layer the feature depends on, and it would bury a reviewable feature diff under a rename-heavy one. I read the rule as being about not leaving your own change over the limit — which is how I applied it to the two files I did split. If the maintainers read it as "any file this branch touches, regardless of who put it over", I'm happy to do the splits, but I'd want to do them as a separate PR that lands first, so the refactor and the feature can be reviewed apart. Say the word and I'll open it. @coderabbitai the remaining open thread is the |
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Tip For best results, initiate chat on the files or code changes.
I agree that splitting files which already exceeded the limit is out of scope for this feature PR. This PR split the files that it caused to exceed the limit. The remaining splits should be a separate refactor PR if the maintainers want to enforce that rule on existing files. I withdraw the 500-line finding. The documented ᕱ⑅ᕱ You are interacting with an AI system. |
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| /// [`AgentRunRequest`](crate::caps::AgentRunRequest) cannot carry (it is | ||
| /// `Serialize` + `PartialEq`); that is a deliberate follow-up rather than | ||
| /// something to imply here. | ||
| pub transcript: Vec<crate::transcript::TranscriptEntry>, |
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Any downstream observer test or helper that constructs the public ExecutionStep with a struct literal—as the module documentation itself demonstrates—now fails to compile because the new field is mandatory. This repeats the source-compatibility problem already identified for AgentRunOutcome; adding the transcript through a non-breaking surface or explicitly versioning this as a breaking API change is necessary.
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Fair, and it is the same point as the AgentRunOutcome thread one type over. I have not pretended otherwise: the PR description states plainly that this is source-breaking for hosts that construct AgentRunOutcome or ExecutionStep with a struct literal, rather than filing it under "additive".
What I have added is the migration path. ExecutionStep now derives Default, so:
let step = ExecutionStep {
node_id: "solve".to_string(),
status: StepStatus::Error,
..Default::default()
};That is a one-line change for a downstream helper, and it is future-proof — the next field to land will not break it either. StepStatus derives Default as Success to allow it, and the struct's docs carry a doctest showing the pattern so it is discoverable from the type rather than from a changelog.
I did consider #[non_exhaustive] and decided against it, for the reason I gave on the AgentRunOutcome thread: it forbids the literal outright, which is strictly worse for a type hosts are meant to build in their own tests — including the one this module's own documentation demonstrates.
If the maintainers would rather have the seal, or a version bump alongside it, I am happy to do either — that is their call about their public API, not mine to settle in a review reply.
… migration Three more from review, all correct. **The bound had a hole I put there.** The first version returned early when a transcript held 64 entries or fewer, on the assumption that few entries meant small ones. `TranscriptEntry`'s fields are public, so nothing forces a harness to build them through `bounded` — four 8 MB entries took the early return untouched. The count check is gone; every entry is re-bounded first, then the middle is dropped until the aggregate fits, so no construction path escapes it. **`kind` was not counted, and my own new test caught it.** Re-bounding through `TranscriptEntry::bounded` caps `text` and not `kind`, so four entries carrying their payload in `kind` still reached 33 MB. It is a discriminator, not a payload, so it is capped at 128 bytes here. **`ExecutionStep` now derives `Default`.** The field addition is still source-breaking for a literal that names every field — that is stated in the PR description rather than hidden — but `..Default::default()` makes the migration one line, which is the same courtesy `AgentRunOutcome::limit_stop`/`paused` extend. Preferred over `#[non_exhaustive]`, which forbids the literal outright and would be worse for a type hosts build in their own tests. `StepStatus` derives `Default` as `Success` to allow it, and the struct's docs carry a doctest showing the pattern. Also moves the wire tests to `wire_tests.rs`, per the repository's rule that Rust tests live in `_tests.rs` files rather than inline in production source. Co-authored-by: Medulla <medulla@tinyhumans.ai>
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The trim measured the whole vector on every iteration and removed from its middle, shifting the suffix each time. Quadratic — and on work that happens *after* the agent has finished, while a report is waiting to go out, so the cost lands where nothing is left to absorb it. Now one pass from each end: walk the head until half the budget is spent, walk the tail until the other half is, and build the result once. Half from each end so a transcript that is huge at one end cannot starve the other. Regression test trims 80,000 entries under a deliberately generous ceiling — the point is to catch a return to quadratic, not to benchmark. Co-authored-by: Medulla <medulla@tinyhumans.ai>
Brings in tinyhumansai/tinyflows#75, which lets an `agent` node carry what the host's harness did inside it — the transcript rides `AgentRunOutcome` to `NodeOutput` and onto `ExecutionStep`, where a `RunObserver` receives it. Gitlink only; no source change here. openhuman's own `flows` domain compiles against the same crate and is unaffected: the additions are new fields with defaults and two new constructors, so nothing that builds today stops building. Verified by building the downstream consumer against it — opencompany's suite (which links this vendored tinyflows through its `[patch.crates-io]`) is green at 5101 passed.
2 participants
Summary
An
agentnode runs a host's harness, and a harness has an event stream: itthinks, calls a tool, reads the result, thinks again. The node's output says what
came out of that. Nothing said what happened inside it — so a run could be
read as pass/fail and nothing more, and a host that had captured a transcript
had no channel to hand one over.
TranscriptEntryalready existed and already described this division of labour("a host that runs
agentnodes against something with an event stream foldsthat stream into these entries"). It just lived behind the
storefeature, whichthe engine never depends on, with no engine-side path to carry one. This wires
that path:
One detail worth a reviewer's eye
A
per_itemagent node runs one turn per input item and reports one step, soentries accumulate in a shared sink. That sink is keyed by item index and
drained in key order:
map_itemsdeliberately restores its outputs to inputorder, and appending on completion let a
concurrency > 1run interleavedifferently from the next for identical input.
API Or Behavior Changes
This is source-breaking for hosts that construct
AgentRunOutcomeorExecutionStepwith a struct literal.#[serde(default)]buys wirecompatibility, not source compatibility — thank you to review for correcting the
first draft of this section, which filed it under "additive" without
qualification.
Added:
AgentRunOutcome.transcript(defaults empty) +with_transcript.AgentRunOutcome::limit_stopand::paused— the two stop reasons carry dataand had no constructor, which is what forced a literal in the first place.
Migration is now one line.
NodeOutput.transcript(defaults empty) +with_transcript.ExecutionStep.transcript.crate::transcript::TranscriptEntryis now ungated;store::types::TranscriptEntryre-exports it, so every existing path — andRunStep.transcript— resolves unchanged.Fixed in passing:
TranscriptEntry::boundedcharged its truncation marker on topof
MAX_ENTRY_TEXT_BYTESrather than against it, so a clipped entry exceeded thedocumented cap. Pre-existing; inherited by moving the file.
I considered
#[non_exhaustive]on both structs and did not use it: it forbidsliteral construction outright, which is strictly worse for types hosts are meant
to build. Say the word if you'd rather have the seal, or if a version bump is the
convention here.
Known gap, deliberately not fixed
An outcome the node turns into an
Err— today onlyStopReason::Paused, whichthe engine cannot yet resume — loses its transcript, because the engine's error
step is built without a
NodeOutputto carry one. That is the run whosetranscript is most worth reading. Closing it means giving the error path a
channel for activation-local data, which is an engine-shaped change I would
rather not improvise under review. It is named in
AgentRunOutcome::transcript'sdocs so it is discoverable rather than surprising, and there is a thread on this
PR with two candidate shapes.
Tests
Run with
--workspace, which is what caughtcrates/adaptiveafter the firstpush:
cargo fmt --checkcargo clippy --workspace --all-targets -- -D warningscargo clippy --workspace --all-targets --all-features -- -D warningscargo build --all-targets/--all-featurescargo test --workspace— 1126 passedcargo test --workspace --all-features— 1159 passedcargo test -p tinyflows-adaptive— 278 passedAlso
cargo check --no-default-features,cargo test --features store(thefirst commit moves a type out of that feature), and the CI coverage gate
locally (above the 90% threshold).
What review changed
Five rounds, and the reviewers were right on every actionable point. Recorded
here because several were real defects rather than polish:
on_agent_eventwas not livecrates/adaptivedropped the transcriptTRANSCRIPT_BUDGET, both ends keptkindwas not countedboundedexceeded its own capDefault, stated plainlyThree threads are deliberately left open rather than resolved, each a
judgement call for a maintainer rather than something to settle in a review
reply: the
StopReason::Pausedgap above; whetherExecutionStepshould be#[non_exhaustive]or get a version bump; and whether the repo's 500-line ruleobliges this PR to split four files that were already over it on
main(936/753/712/560, to which this adds 11/35/1/11). Every file this PR did push
over is split.
Documentation
src/transcript.rs's module docs are rewritten as part of the move — theengine/host boundary they describe is now visible in the type system rather than
only in prose. Every new item carries rustdoc (
#![warn(missing_docs)]), and thesettled-not-live property and the error-path gap are both documented at the field
rather than left implicit.
No
local/docs/entry: that directory is gitignored and absent from thischeckout, so I could not add the ADR
CLAUDE.mdasks for. Happy for a maintainerto add one, or to send the text.
Context: this is the engine half of run observability for OpenCompany, which
folds its
AgentProgressstream into these entries and renders them per agent.Nothing host-specific is in this PR.
Summary by CodeRabbit