CON-213: recover campaign_assistant from max tool-call iterations - #111
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The Haiku planner routing loop was capped at MaxTurns=2 (CON-112), which
genkit counts as tool-emitting rounds. A legitimate read-then-act chain
(getCampaignOverview -> listCampaignPosts -> generatePosts) blew the budget
and aborted the whole turn with a hard 502 -- discarding tool side effects
that had already committed (posts, brief, dates) plus the streamed reply.
Fix, three parts:
- Raise MaxTurns 2->4 so the read-then-act chain fits.
- Add a per-turn heavy-action latch (requestState.heavyActionRan): the five
expensive sub-flow tools (runContentPlan, generatePosts, enrichBrief,
checkBrief, checkPostsConsistency) run at most once per turn, returning a
benign note/summary instead of re-running. This enforces CON-112's real
intent ("don't chain heavy Sonnet sub-flows") precisely, decoupled from the
turn budget. Signalled via a return value, not a Go error -- genkit treats a
tool error as fatal and aborts Generate.
- Recover from genkit's "exceeded maximum tool call iterations" abort instead
of 502ing: finalise from committed st.*Result + streamed scanner text (resp
is nil on this error, so resp.* accesses are nil-guarded); only 502 with a
friendly "split it up" message when nothing committed.
Prompt nudge: run at most one generation/review action per message.
Tests: add TestHeavyActionRan + TestIsMaxTurnsExceeded.
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WalkthroughThe campaign assistant now permits read-only tool chains while limiting each message to one heavy action. It recovers from maximum tool-iteration cutoffs, preserves usable results, and returns actionable errors when no result exists. ChangesCampaign assistant controls
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🟡 Moderate · up to Concurrent tool calls can bypass the one-heavy-action limit, causing duplicate expensive operations and races while updating campaign state. The PR should add atomic reservation and a concurrency test before merge. Sequence Diagram(s)sequenceDiagram
participant CampaignAssistant
participant ReadOnlyTools
participant HeavyActionTools
participant requestState
CampaignAssistant->>ReadOnlyTools: run preliminary read-only calls
CampaignAssistant->>HeavyActionTools: invoke one generation or review action
HeavyActionTools->>requestState: set heavyActionRan
CampaignAssistant->>HeavyActionTools: invoke another heavy action
HeavyActionTools-->>CampaignAssistant: return skip note
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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Inline comments:
In `@src/genkit/flows/campaign_assistant/tools.go`:
- Around line 67-86: Make heavyActionRan an atomic reservation on requestState
by adding mutex-protected reservation state, and update all five heavy-action
guards to reserve before starting their sub-flow rather than relying on result
fields set afterward. Preserve the existing skip behavior for callers that fail
to reserve, and add a concurrent test verifying exactly one reservation
succeeds.
Apply the same fix in `@src/genkit/flows/campaign_assistant/tools_test.go` around
lines 216 - 250: The existing test does not exercise simultaneous reservations;
add the concurrent assertion here.
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📒 Files selected for processing (5)
src/genkit/flows/campaign_assistant/prompts/campaign_assistant.tmplsrc/genkit/flows/campaign_assistant/run.gosrc/genkit/flows/campaign_assistant/tools.gosrc/genkit/flows/campaign_assistant/tools_test.gosrc/server/campaign_assistant.go
genkit dispatches a turn's tool calls in parallel goroutines, so the previous heavyActionRan() latch — which inferred "a heavy action already ran" from the *Result pointer fields set after a sub-flow completes — had a TOCTOU flaw and a data race: two heavy tools emitted together could both read all-nil and start, and reading fields other goroutines write trips -race. Replace it with reserveHeavyAction(), a mutex-guarded compare-and-set that admits exactly one winner per turn; the five heavy tools now reserve up front and skip on failure (same heavySkipNote). The winning tool is the sole writer of its result field, so the *Result fields stay lock-free (single-writer, read after the tool barrier). Tests: replace TestHeavyActionRan with TestReserveHeavyAction_Sequential and TestReserveHeavyAction_Concurrent (64 goroutines, exactly one winner; passes under -race).
1 participant
Fixes CON-213. The Campaign Assistant was failing turns with a hard 502:
Root cause
The Haiku planner routing loop is capped at
MaxTurns=2(src/server/campaign_assistant.go, set in CON-112 for cost/latency). genkit counts a "turn" as a model turn that emits tool calls — soMaxTurns=2lets the planner call tools on only two rounds before it's forced to answer. A legitimate read-then-act chain (getCampaignOverview→listCampaignPosts→generatePosts) needs three rounds and trips the guard (ai/generate.go:390).Worse, on that abort the flow bailed immediately (
run.go), discarding tool side effects that had already committed — posts created, brief rewritten, dates changed — plus the already-streamed reply. The user saw a failure over work that actually happened.Fix
Three parts, decoupling the turn budget from the real cost concern:
MaxTurns2 → 4 so the read-then-act chain fits.requestState.heavyActionRan): the five expensive sub-flow tools (runContentPlan,generatePosts,enrichBrief,checkBrief,checkPostsConsistency) run at most once per turn, returning a benignnote/summaryinstead of re-running. This enforces CON-112's real intent — "don't chain heavy Sonnet sub-flows in one turn" — precisely, instead of via a blunt turn cap. Signalled via a return value, not a Go error: genkit treats a tool returning an error as fatal and abortsGenerate."exceeded maximum tool call iterations"abort is now recovered rather than 502'd. The turn finalises from committedst.*Result+ streamed scanner text (respis nil on this error, soresp.*accesses are nil-guarded); it only 502s — with a friendly "try splitting it into smaller requests" message — when nothing committed.Plus a prompt nudge: the planner is told to run at most one generation/review action per message, so it rarely even tries to chain.
Behavior change
An explicit multi-action request ("enrich the brief and generate a plan") now performs the first action and offers the rest as a follow-up, rather than chaining both. This is intended cost control — and the user no longer gets an error either way.
Testing
go build+go vetclean oncampaign_assistantandserver; integration package compiles (-tags integration).TestHeavyActionRanandTestIsMaxTurnsExceeded.Summary by CodeRabbit