Deliver steering mid-turn at the tool-call boundary - #239
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Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe change adds mid-turn steering across the LLM client and chat streaming service. Each send owns a steering queue. Tool-call boundaries deliver queued text through a sink, which persists messages and emits delivery or discard events. Tests cover API wiring, transport races, persistence, ordering, approvals, and turn caps. ChangesMid-turn steering
Estimated code review effort: 4 (Complex) | ~60 minutes Merge Risk: ⚪ Minimal · up to Steering messages are delivered during running turns at tool-call boundaries and recorded in conversation history. Current coverage and checks indicate no actionable merge-blocking risk. Sequence Diagram(s)sequenceDiagram
participant ChatServiceImpl
participant AgentStream
participant MidTurnSteering
participant ConversationService
ChatServiceImpl->>AgentStream: run turn with SteeringQueue
AgentStream->>ChatServiceImpl: SteeringDelivered text
ChatServiceImpl->>MidTurnSteering: delivered(text)
MidTurnSteering->>ConversationService: add_message(user text)
MidTurnSteering-->>ChatServiceImpl: emit delivery or discard event
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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The Provider-backed E2E check is red for the reason tracked in #240: the Ollama account no longer subscribes and the workflow's fallback model is behind a subscription, so the job takes HTTP 402 and fails in under half a second without reaching application code. The same failure is on #236 and #238. Everything else passes: Coverage, Tests, both platform builds, the clippy and structural lint gate, formatting, and CodeRabbit with no actionable threads. Worth noting what the green Tests check covers here, since the local and CI numbers should agree: 1986 passed, 0 failed, which is the 1988 from the delivery commit minus the two seed-path tests deleted with the path they exercised. The mid-turn behaviour itself is pinned by nine steering tests across the transport, sink, approval, discard and FIFO cases. |
Upstream serdes-ai-agent c0e7327 drains a SteeringQueue inside the running turn, so the issue-222 between-turn chaining is no longer the only way to deliver a steer. This plan moves delivery to the tool-call boundary while keeping the #222 guarantees that still matter: capped queues, terminal events for every bubble, FIFO correlation by position, and stop/cancel semantics. The core decision is persistence timing: delivered steers are persisted on SteeringDelivered, and a persist failure fails the turn loudly, because the fork shows the text to the model before PA can write it. Persisting at acceptance instead would fill the database with instructions the model never received and force cancel to delete user rows. PLAN-20260905-STEERINT
Issue #222 ships steering as local turn chaining: a steer typed during a running turn waits for the whole turn to end before a chained turn carries it to the model. Upstream serdesAI commit c0e7327 adds what true mid-turn delivery needs in serdes-ai-agent: a SteeringQueue transport whose receiver parks back on drop so undelivered texts survive a run, a RunOptions::steering builder, and an AgentStreamEvent::SteeringDelivered emitted at the tool-call boundary after tool returns and before the next model request. All eight serdes-ai-* entries move to that rev in one commit because cargo resolves one source per package name and serdes-ai-responses only exists on this fork, so partial moves cannot resolve. The upstream delta is a single commit confined to serdes-ai-agent plus workspace metadata; the other crates rebuild from identical sources. No PA source changes ride along. Nothing references SteeringQueue yet, so no queue is attached, the fork drains nothing, and behavior is byte-identical; the full existing suite passes unchanged. @plan PLAN-20260905-STEERINT.P01
Against the steering fork rev, AgentStreamEvent::SteeringDelivered now compiles, and handle_agent_stream_event's catch-all would swallow it with a debug log and zero compiler diagnostics. The model would receive steered text that nothing in PA ever observed. The explicit arm before the catch-all closes that hole, and a regression guard test proves the arm's presence: with the arm removed the recording sink sees nothing and the test fails; with it the sink records exactly the delivered text. src/llm/steering.rs carries the two pieces the LLM layer needs. The SteeringDeliverySink trait object points the dependency at the service layer, so persistence stays out of the LLM crate, and SteeringInput bundles the transport queue with the sink that observes deliveries. The trait needs a Send supertrait because the run_agent_stream future must be Send across the sink reference. handle_agent_stream_event becomes async and takes Option<&mut SteeringInput>. A sink refusal emits a stream error and fails the run, the same shape as the existing mid-stream failure path: a delivered steer the store rejected must never pass silently. A delivery without steering input is impossible by construction and is reported as the wiring bug it is, loudly. RunOptions gains the queue clone when steering is attached. stream_agent_response passes None for now, so no queue is attached, the fork drains nothing, and production behavior is byte-identical; real wiring lands with the service-layer phase. The legacy send_message_stream path is deliberately untouched. Tests calling run_agent_stream and the pre-existing handler tests pass None and await the now-async handler; the converted handler tests also stop discarding its must_use Result. On the hot path: handle_agent_stream_event runs for every stream event. A plain async fn (no #[async_trait], no boxed future) builds a 24-byte stack future and, when steering is None, reaches no await point, so a 50M-iteration probe measures the added dispatch at about half a nanosecond per event against a quarter-nanosecond sync baseline, noise beside the per-event tracing event and callback dispatch that already run there. @plan PLAN-20260905-STEERINT.P02
Acceptance so far ended at the confirm re-check, leaving the service queue as the only place a steer existed. Mid-turn delivery needs a second half: the fork's SteeringQueue is the transport, the only thing that moves text into a model request, and a steer that is accepted but never committed to it can never be delivered. The commit is the point of no return, so it runs last. The entry lands on the service queue, the view is told, the re-check confirms the turn is still there, and only then does the text go into the transport. Committed in the other order, a withdrawn steer would linger in a transport that a later run of the same send delivers: a ghost instruction the user took back. ActiveStream carries one queue per send, created with the reservation and dropped with the slot, so committed texts can never outlive the send they were accepted against. A commit that reads a slot the teardown already removed takes its entry back off the queue and announces the same discard the withdrawal path does, with the same no_active_turn refusal, so the two windows are indistinguishable to a caller. run_stream_task receives the queue clone now; attaching it to the turns is the next phase. @plan PLAN-20260905-STEERINT.P03 @requirement REQ-SI-002 @requirement REQ-SI-007
The fork drains a queued steer at the tool-call boundary and reports it with SteeringDelivered. Until now PA attached no queue to its turns, so that event never fired and steering still waited for the turn to end. The send's transport queue is now attached to every turn and a sink observes what the model actually received. Persistence happens on receipt, not at acceptance. The fork appends the text to the model request inside its own task, so PA cannot hold a write in front of that: the honest invariant is that the database records what the model saw. Persisting at acceptance instead would store rows for steers the model may never receive, which turns every discard into a row deletion and makes the transcript lie about what was typed. A steer that cannot be persisted fails the turn through the existing mid-stream failure path, and its own entry is announced discarded here rather than left for teardown to announce a second time. The model has already seen that text, so the divergence is reported and never retried. Correlation is by FIFO position: the fork drains in order, acceptance pushes in the same order, and one AgentStream per send holds the receiver, so the head of the queue is always the entry a delivery belongs to. Matching by text would collapse two identical steers into one. A mutation check confirmed the guard has teeth: swapping the head pop for a text match makes duplicate_texts_resolve_to_distinct_entries _in_push_order fail, and restoring it makes the test pass again. An empty deque means teardown already announced the discard, so the row is persisted with no second terminal event. run_stream_task carries the queue to the turns, and the test hooks moved into chat_impl/stream_test_hooks.rs to keep chat_impl.rs under the thousand line limit that the new queue accessor pushed it past. @plan PLAN-20260905-STEERINT.P04 @requirement REQ-SI-001 @requirement REQ-SI-003 @requirement REQ-SI-005
Mid-turn delivery made PA's end-of-turn path redundant. The fork now drains a queued steer at the tool-call boundary, and the sink persists the text and resolves the entry by popping the queue head, so the old path, which drained the same queue and seeded the texts into the next turn's history, would deliver every leftover twice: once by the transport at the boundary and once by PA through the seed. Deletion is what prevents the double delivery. A guard or flag would keep both paths live and force the reader to reason about which one wins; with one path gone there is nothing to arbitrate. With delivery inside the turn, no step between a turn's persist and the next turn's start can fail, so the ChainOutcome::OutputPersisted exit was unreachable and the enum collapses; the chain always ends in finalize_by_outcome now. The loop's leftover check becomes a peek, not a drain: the transport still owns the texts and must deliver them itself, and draining in PA would strand a text the transport still holds. Only the turn cap still takes the entries, because no turn of that send can deliver them. Tests that exercised the seed path are gone or rewritten to the mid-turn shape. A text-only turn now has a test of its own: its steer stays queued, the chained turn's boundary delivers it through the real sink, and PA never seeds the text. @plan PLAN-20260905-STEERINT.P04 @requirement REQ-SI-002 @requirement REQ-SI-006
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The previous pinned rev c0e7327a880f8d3013bb47c56c2fb231e3e93264 was a commit on a fork feature branch that has since been rebased away. It no longer exists upstream, so fresh clones cannot resolve it and builds fail at fetch. Point all eight serdes-ai entries at aa0eb8715065af55e98d098116d14964b0fcd7b0 on the pa-integration branch of acoliver/serdesAI. That integration commit carries both the OpenResponses client that serdes-ai-responses is built on and the steering input queue in one tree until the upstream PR lands. Cargo.lock picks up the same rev for the five transitive serdesAI workspace crates. The suite result is identical before and after the repin.
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Two corrections to this PR, both found after it was opened. The pinned rev changed. The eight The test totals in the description are nine too low. The body says 1975 to 1979 to 1988 to 1986. Those came from a summing script that mis-parses one line: The repin was verified count-neutral rather than assumed: a baseline run at the same HEAD with the old pins restored produced an identical 1995 / 0. |
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Inline comments:
In `@src/services/chat_impl/steering.rs`:
- Around line 284-285: Update the queued-steering entry and the flow around
queue_steering and commit_steering_to_transport to retain the originating
stream_id. During confirmation and commit, require the queued entry’s stream
identity to match the currently active stream; discard mismatched entries
instead of sending them through the replacement stream’s transport.
In `@src/services/chat_impl/streaming/steering_sink.rs`:
- Around line 41-43: Change MidTurnSteering::delivered from Vec<String> to
usize, treating it as a delivery counter rather than stored text; increment it
after each steering message is persisted and update production logging to use
the count directly. Revise the replay-related comment and affected tests to
reflect count-based behavior, while preserving delivery ordering and
persistence.
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Fix all unresolved CodeRabbit comments on this PR:
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Cargo.lockis excluded by!**/*.lockproject-plans/steering-integration/plan.mdis excluded by!project-plans/**
📒 Files selected for processing (25)
Cargo.tomlsrc/llm/client_agent.rssrc/llm/client_agent/tests.rssrc/llm/mod.rssrc/llm/steering.rssrc/services/chat_impl.rssrc/services/chat_impl/steering.rssrc/services/chat_impl/stream_test_hooks.rssrc/services/chat_impl/streaming.rssrc/services/chat_impl/streaming/steering_delivery.rssrc/services/chat_impl/streaming/steering_sink.rssrc/services/chat_impl/support.rssrc/services/chat_impl/tests/steering.rssrc/services/chat_impl/tests/steering/transport.rssrc/services/chat_impl/tests/steering_delivery.rssrc/services/chat_impl/tests/steering_delivery/approval.rssrc/services/chat_impl/tests/steering_delivery/discard.rssrc/services/chat_impl/tests/steering_delivery/sink.rssrc/services/chat_impl/tests/stream_failure/finalization.rstests/e2e_agent_tool_execution.rstests/e2e_codex_stream.rstests/e2e_install_and_search.rstests/e2e_real_tool_execution.rstests/kimi_agent_path_tests.rstests/open_responses_wire_tests.rs
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The two outstanding review findings are addressed in b3e0fad. Each queued steer now retains the stream ID captured by its initial running-state check. Both confirmation and transport commit resolve only that originating stream's running transport. Replacement streams refuse and discard the stale entry instead of receiving it. Two regression tests exercise replacement before confirmation and before commit. Both failed against the previous implementation; all 71 steering tests pass with the fix. The delivery sink retains a count instead of each delivered text, and the replay comment and count assertion are updated. The dependency remains pinned to aa0eb8715065af55e98d098116d14964b0fcd7b0 on the fork. Main's merged #236 and #238 are included for combined CI verification. Local full gates and the updated PR checks are running. @coderabbitai Please verify these two findings against the original PR scope; do not expand the follow-up into unrelated requirements. |
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Tip For best results, initiate chat on the files or code changes. 🧩 Analysis chain🏁 Script executed: #!/bin/bash
set -euo pipefail
echo '== Follow-up commit summary =='
git show --stat --oneline --decorate --no-renames b3e0fad
git diff --no-ext-diff --unified=80 b3e0fad^ b3e0fad -- \
src/services/chat_impl/steering.rs \
src/services/chat_impl/streaming/steering_sink.rs \
src/services/chat_impl/tests/steering/transport.rs \
src/services/chat_impl/tests/steering_delivery/sink.rs
echo '== Relevant file outlines =='
ast-grep outline src/services/chat_impl/steering.rs --items all
ast-grep outline src/services/chat_impl/streaming/steering_sink.rs --items all
ast-grep outline src/services/chat_impl/tests/steering/transport.rs --items all
ast-grep outline src/services/chat_impl/tests/steering_delivery/sink.rs --items all
echo '== Stream binding and replacement regression references =='
rg -n -C 8 \
'stream_id|replacement|confirm|commit|discard|transport' \
src/services/chat_impl/steering.rs \
src/services/chat_impl/tests/steering/transport.rs
echo '== Delivery counter and sink assertion references =='
rg -n -C 8 \
'delivered|add_message_attempts|persist|discard' \
src/services/chat_impl/streaming/steering_sink.rs \
src/services/chat_impl/tests/steering_delivery/sink.rsLength of output: 128501
The two new transport tests cover replacement before confirmation and replacement before commit. They assert refusal, queue removal, no item in the replacement transport, and
I found no remaining issue in either addressed finding. I did not run the test suite because this sandbox does not support compilation or test execution. If you found this review helpful, would you consider giving us a shout-out on X? Thank you for using CodeRabbit! You are interacting with an AI system. |
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Fixes #237
#222 shipped steering as local turn chaining: a steer typed during a turn waited for that turn to finish, then ran a whole new turn seeded with the text. The issue asked for delivery between tool calls, and that was not reachable then, because
AgentStreamexposed only events andcancel()with no way to feed input into a running turn.The dependency now has that channel, so this moves delivery inside the turn. A steer typed while the agent is working reaches the model at the next tool-call boundary, after the step's tool returns are appended and before the next model request.
The pieces
SteeringQueuecomes from the fork (acoliver/serdesAI#3, revc0e7327). It drains FIFO at the tool boundary, emitsSteeringDelivered { step, text }after that step'sToolExecutedevents and before the nextRequestStart, and deliberately drains nothing before the first model request or at a text-only end of turn.All eight
serdes-ai-*pins move together to that rev, because cargo resolves one source per package name andserdes-ai-responsesexists only on the fork.SteeringDeliverySinkinsrc/llm/steering.rscarries the fork's event into the service layer. The match onAgentStreamEventends in a catch-allother => tracing::debug!(...), so a new variant compiles fine and is silently swallowed; the explicit arm sits immediately before that catch-all, and a test fails if it is removed. That test was verified red first: the recording sink saw[]against an expected delivered text.Acceptance commits the text to the transport only after
confirm_or_withdraw_steeringhas re-checked that the turn is still running, both with?, so the ordering is structural rather than a comment.Persistence happens on receipt, and why
#222 persisted a steer before announcing it, so the model was never shown text the database had rejected. That ordering is only possible between turns, where PA controls the sequence. Mid-turn the fork appends the text to the model request inside its own task, and PA learns about it afterwards. The write cannot be held in front of that.
So the invariant changes to the honest one available at this boundary: the database records what the model saw. Persisting at acceptance instead would store rows for steers the model may never receive, which turns every discard into a row deletion and makes the transcript lie about what was typed. A steer that cannot be persisted fails the turn through the existing mid-stream error path and announces its own discard; the divergence is reported, never retried.
Reload ordering needs no change to
build_llm_messages. Rows land as[turn prompt, steers, assistant output], and PA already collapses intra-turn interleaving into one assistant row per turn, so the bar is row order rather than step fidelity.Correlation is positional
The fork drains in order, acceptance pushes in order, and one queue belongs to one send, so the head of the queue is always the entry a delivery belongs to. Matching by text would collapse two identical steers into one entry.
A mutation check confirms the guard holds: swapping the head pop for a text match makes
duplicate_texts_resolve_to_distinct_entries_in_push_orderfail, and restoring it makes the test pass again.What was deleted
The old end-of-turn seed path is gone, not guarded:
deliver_steering, theLlmMessage::userseed push, andChainOutcome::OutputPersisted, which became unreachable once no step exists between a turn's persist and the next turn's start. Leaving it behind a flag would have meant two delivery paths racing for the same entry.The leftover check is now a peek rather than a drain, because the transport owns those texts and delivers them itself; draining here would strand them.
MAX_STEERING_TURNS = 10, the queue cap of 5, and the discard announcements on every ending are unchanged.Verification
Every phase ran the full gate set:
cargo fmt --all -- --check, the CI clippy invocation with all six denied lints,cargo test --lib --tests,cargo xtask guard,lizard -C 50 -L 100 -w src/, and the 1000-line file gate.The suite went 1975 (pins only, proving the bump inert) to 1979 to 1988 to 1986 passed, 0 failed. The final decrease is two obsolete tests removed with the seed path they covered, against one added for the text-only leftover case; the approval interaction test moved to
tests/steering_delivery/approval.rsrather than being dropped.chat_impl.rstest hooks moved tochat_impl/stream_test_hooks.rsto stay under the file gate. No lint suppressions were added.Follow-up, not in this change
run_stream_tasknow takes 13 parameters behind a pre-existing#[allow(clippy::too_many_arguments)]. It passes every gate, but that seam wants a context struct, and bundling it here would have mixed a refactor into a behavior change.Summary by CodeRabbit