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fix(claude_code): do not re-send already delivered user turns to a shared session - #364
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Resumed sessions now skip user turns already delivered to the Claude session, tracked by per-thread fingerprints in the session store, so another service or loop iteration on the same thread does not make the model see the same message twice. When every pending turn was already delivered, a notice is sent instead of the text, and the delivered record is reset whenever a thread maps to a new session UUID. Auto-committed-on: dragonfly Co-authored-by: Medulla <medulla@tinyhumans.ai>
Resuming a shared session re-sent the pending user turn to the CLI on every call, so parallel services or loop iterations duplicated the same input. The session store now records fingerprints of delivered turns and the input builder skips any pending turn already delivered, while a new session still starts with an empty record. Auto-committed-on: dragonfly Co-authored-by: Medulla <medulla@tinyhumans.ai>
The allowlist of bare `ChatMessage` references in the Claude Code provider was refreshed to match the current line positions and newly added call sites, so the boundary check keeps failing on genuinely new debt instead of stale entries. Auto-committed-on: dragonfly Co-authored-by: Medulla <medulla@tinyhumans.ai>
Replace the tuple slice type annotation on the known debt constant with a plain slice of string and usize pairs, which is equivalent and easier to read. Auto-committed-on: dragonfly Co-authored-by: Medulla <medulla@tinyhumans.ai>
Document that on `--resume` the builder skips user turns already delivered to the session, since `session_store` keeps per-thread fingerprints and services or loop iterations sharing a thread would otherwise re-send them. Auto-committed-on: dragonfly Co-authored-by: Medulla <medulla@tinyhumans.ai>
Tiny Sweeper reviewTiny Sweeper reviewed this change across 6 lane(s) and found 10 active actionable finding(s). Detailed lane evidence and any incomplete work are listed below. State: Changes requested Review snapshot
Completeness: Complete What changedThe review could not produce a supported behavioral summary; inspect the cited changed surface and lane details below. FeaturesNone identified with supported citations. TestsNo supported feature-to-test mapping was produced. Test execution is not inferred. Findings
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How this fits togetherflowchart LR
n0["build_stdin<br/>changed"]:::changed
n1["invalid_native_images_use_the_text_fallback<br/>changed"]:::changed
n2["SessionStore<br/>changed<br/>14 findings"]:::blocking
n3["run_turn"]:::impacted
n4["ChatMessage"]:::impacted
n5["TurnContext"]:::impacted
n0 -->|uses| n4
n1 -->|calls| n0
n1 -->|tests| n0
n3 -->|calls| n0
n3 -->|uses| n5
n5 -->|uses| n2
n5 -->|uses| n4
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
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The title clearly and concisely describes the primary change: preventing already delivered user turns from being sent again to shared Claude Code sessions. |
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Docstring coverage is 87.23% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 47 functions across 7 files. |
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A rabbit checks each turn’s small trace,
And keeps its fingerprint in place.
Resumed paths skip what went before,
New sessions carry turns once more.
The CLI runs; the records stay,
While carrots mark a tidy day.
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Review comments at
@crates/tinyagents-harness/src/providers/claude_code/input_builder.rs:
- Around line 144-146: Update the fingerprint generation in the message mapping
to identify each pending user turn independently of assistant reply text and
history-slice-relative index. Reuse a stable, unique turn identity so repeated
turns remain distinct and the same turn retains its fingerprint across different
history slices.
Review comments at
@crates/tinyagents-harness/src/providers/claude_code/session_store.rs:
- Around line 56-62: Coordinate SessionStore instances that use the same file so
their delivered fingerprints stay current across providers. Update SessionStore
reads and writes to share synchronized state across instances, or reuse one
synchronized store for providers targeting that file; ensure delivered reflects
fingerprints persisted by another instance.
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crates/tinyagents-harness/src/providers/claude_code/README.mdcrates/tinyagents-harness/src/providers/claude_code/driver.rscrates/tinyagents-harness/src/providers/claude_code/driver_tests.rscrates/tinyagents-harness/src/providers/claude_code/input_builder.rscrates/tinyagents-harness/src/providers/claude_code/input_builder_tests.rscrates/tinyagents-harness/src/providers/claude_code/session_store.rscrates/tinyagents-harness/src/providers/claude_code/session_store_tests.rscrates/tinyagents-integration-tests/tests/dependency_boundary.rs
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…ode/driver.rs,crates/tinyagents Auto-committed-on: dragonfly Co-authored-by: Medulla <medulla@tinyhumans.ai>
Rework the claude-code tests to inspect the JSON blocks the CLI actually receives instead of substring-matching raw stdin, and add coverage for fingerprint stability, repeated turns, and cross-instance delivery visibility. The driver's record_delivered call is only reformatted. Auto-committed-on: dragonfly Co-authored-by: Medulla <medulla@tinyhumans.ai>
The known-debt allowlist for generic Claude Code chat message usage was refreshed to match the current line numbers in the harness sources, and newly flagged lines in input_builder_tests.rs were added so the boundary check passes again. Auto-committed-on: dragonfly Co-authored-by: Medulla <medulla@tinyhumans.ai>
The delivered accessor on SessionStore is only used by tests, so it is now compiled under cfg(test) to keep it out of non-test builds. Auto-committed-on: dragonfly Co-authored-by: Medulla <medulla@tinyhumans.ai>
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description: $0.0002 · 15,714 in / 1,781 out · 1,408 cached (9%) · glm-5.3-flash
Reservations taken by claim_delivered are now tracked process-locally instead of being persisted, so a crash mid-turn can no longer leave an undelivered turn marked as delivered. A process-wide file lock serializes read-modify-write cycles across store instances, and persistence writes to a temporary file before renaming so readers never observe a partial file. Auto-committed-on: dragonfly Co-authored-by: Medulla <medulla@tinyhumans.ai>
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Replace the fixed sleep in the concurrent claim test with a barrier so all eight threads reach the claim point together, removing timing dependence that could let the test pass or fail spuriously on slow or fast machines. Auto-committed-on: dragonfly Co-authored-by: Medulla <medulla@tinyhumans.ai>
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Update the vendored tinyinference submodule to a newer revision. Auto-committed-on: dragonfly Co-authored-by: Medulla <medulla@tinyhumans.ai>
Revert the workspace crates from 0.3.1 back to 0.3.0 in the lockfile. Auto-committed-on: dragonfly Co-authored-by: Medulla <medulla@tinyhumans.ai>
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Update the vendored tinyinference submodule to 0.3.1 and refresh the corresponding crate versions in Cargo.lock. Auto-committed-on: dragonfly Co-authored-by: Medulla <medulla@tinyhumans.ai>
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The previously-blocking findings are resolved. Clearing the changes request.
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| /// Serializes every read-modify-write of a store file across all | ||
| /// `SessionStore` instances in this process (two providers on one workspace). | ||
| /// Separate OS processes are not locked against each other. |
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Lock the store across processes
FILE_LOCK only coordinates SessionStore instances in one process. Two provider processes sharing the workspace can both read the same delivered set, independently claim the same fingerprint, and then deliver it twice; concurrent writes can also overwrite one another. Use an OS-backed lock around the read-modify-write and claim operation, or explicitly make the store single-process and prevent concurrent process use.
Additional critique observation
Add an inter-process lock for the store file
[RULE] inter-process-synchronization
FILE_LOCK only serializes SessionStore instances in this process, and IN_FLIGHT is also process-local. If two provider processes share this workspace, both can claim the same fingerprint before either records it, so the turn may be sent twice. Their read-modify-write operations can also both read the same JSON and rename their own result, causing the last writer to discard the other process's deliveries. Use an OS/file lock (covering claim and persistence) or explicitly prevent concurrent processes from sharing the workspace.
[RULE] cross-process-synchronization ·
| .sessions | ||
| .insert(thread_id.to_string(), uuid.to_string()); | ||
| let serialized = serde_json::to_string_pretty(&*guard).map_err(std::io::Error::other)?; | ||
| if previous.as_deref() != Some(uuid) { |
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Invalidate claims when replacing a session
Replacing a thread's session clears its durable fingerprints but leaves matching entries in IN_FLIGHT. If an old call is still running when a new session is installed, the new call can see the old claim and skip sending that turn even though the replacement session never received it. Claims need to be keyed by session UUID or invalidated when the session changes.
Additional critique observation
Invalidate claims when replacing a session
[RULE] stale-delivery-claim
Replacing a thread's session clears the durable fingerprints but leaves matching entries in IN_FLIGHT. For example, after claim_delivered("t", ["x"]), calling set("t", "new-uuid") causes a subsequent claim to suppress x as still in flight even though that reservation belongs to the old session. Worse, the old caller can later call record_delivered("t", ["x"]), marking x delivered for the new session and causing it to be skipped permanently there. Associate claims with the session UUID (or a generation) and reject/release claims from the previous session when set replaces it.
[RULE] stale-delivery-claim ·
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Resolve conflicts with #360 (stale-session recovery) and #363 (stdout errors): keep both sides' tests, move remove_if into SessionStore so it uses the delivered-turn store's locking and persistence, and have it drop the thread's delivered-turn record with the mapping (a replacement session has received nothing). Add a regression test for that and refresh the dependency_boundary line baseline. Co-authored-by: Medulla <medulla@tinyhumans.ai>
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| // One-shot (non-durable) calls never resume, so they record nothing. | ||
| if ctx.persist_session { | ||
| let accepted_id = mapper.session_id.as_deref().unwrap_or(&cc_session_id); | ||
| if let Err(error) = ctx.session_store.record_delivered(&ctx.thread_id, &pending) { |
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When two provider instances resume the same thread concurrently, caller A can reserve a pending turn while caller B sees it as in-flight and sends only the already-delivered notice. If B succeeds first, this call records the entire pending list—including A's still-unconfirmed fingerprint—even though B did not send that turn. If A then fails, dropping its claim cannot make the turn retryable because B has persisted it as delivered, so all later attempts suppress the user's message permanently. Persist only the fingerprints this invocation actually claimed and sent.
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| let reply_ordinal = non_system | ||
| .iter() | ||
| .filter(|message| message.role == "assistant") | ||
| .count(); |
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For provider instances holding different slices of the same thread, counting every assistant message makes the same pending turn hash differently. For example, [u0, a0, u1, a1, pending] uses ordinal 2 while a truncated [u1, a1, pending] uses ordinal 1 despite having the same anchor and pending content; after the first instance records delivery, the second misses that record and sends the user turn again. This contradicts the function's stated cross-slice identity requirement and can duplicate model/tool actions, so the boundary component must not depend on assistant turns that may have been trimmed from the caller's history.
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Requesting changes: 1 lane(s) blocking, worst finding is high.
Fix or reply to the findings below and push. The next review clears this automatically once they are gone — you should not need to dismiss anything by hand.
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| delivered: HashMap<String, Vec<String>>, | ||
| } | ||
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| /// Serializes every read-modify-write of a store file across all |
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Lock the store across OS processes
The lock only coordinates instances in one process. Two processes sharing a workspace can both refresh the same JSON, perform independent read-modify-writes, and rename their results, so one process can lose the other's session or delivery updates. Use an OS-level lock covering refresh and persistence, or another cross-process serialization mechanism.
[RULE] inter-process-locking ·
| let serialized = serde_json::to_string_pretty(&*guard).map_err(std::io::Error::other)?; | ||
| if let Some(parent) = self.path.parent() { | ||
| std::fs::create_dir_all(parent)?; | ||
| if previous.as_deref() != Some(uuid) { |
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Invalidate in-flight claims when replacing a session
Changing a thread's UUID clears only the persisted fingerprints. Any existing IN_FLIGHT entries for the thread remain keyed only by path, thread, and fingerprint. If an old call is still running when the session is replaced, a subsequent claim for the new session sees the stale reservation and suppresses delivery to the replacement session, potentially losing the turn. Claims must be associated with the session UUID or invalidated when the mapping changes.
Additional security observation
Invalidate in-flight claims when replacing a session
[RULE] claim-invalidation
Changing a thread's session clears the durable record but leaves matching entries in IN_FLIGHT. A concurrent call can therefore be blocked on the new session by a claim belonging to the old one, and the old call can later record its fingerprints into the replacement session. Session replacement must invalidate or namespace outstanding claims and prevent old-session completions from recording into the new session.
[RULE] stale-delivery-claims ·
| .map(|v| v.iter().cloned().collect()) | ||
| .unwrap_or_default(); | ||
| let mut in_flight = IN_FLIGHT.lock().unwrap_or_else(|e| e.into_inner()); | ||
| for (path, thread, fingerprint) in in_flight.iter() { |
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Normalize store paths before comparing in-flight claims
The in-flight key compares raw PathBuf values rather than the file they identify. For example, two stores opened with /workspace/claude-code-sessions.json and /workspace/./claude-code-sessions.json share the same file and are serialized by FILE_LOCK, but the second claim does not see the first reservation and can deliver the same fingerprint twice. Canonicalize the store path (including symlink handling as appropriate) before using it as the in-flight identity.
[RULE] canonical-resource-identity ·
| // Write-then-rename so a reader never sees a half-written file. | ||
| let tmp = self.path.with_extension("json.tmp"); | ||
| std::fs::write(&tmp, serialized)?; | ||
| std::fs::rename(&tmp, &self.path) |
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Use a replacement strategy that works on Windows
On Windows, std::fs::rename fails when the destination already exists, so every update after the first persisted store file can return an error instead of updating the session or delivery state. Use a platform-appropriate atomic replacement mechanism, or explicitly handle the Windows destination-replacement behavior.
[RULE] platform-compatibility ·
| /// Keep the newest [`MAX_DELIVERED_PER_THREAD`] fingerprints, but never fewer | ||
| /// than `keep_at_least` (the batch just recorded), so a turn still eligible for | ||
| /// retry is not forgotten. | ||
| fn trim(entry: &mut Vec<String>, keep_at_least: usize) { |
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Retain fingerprints for the full deduplication window
After 257 distinct turns are recorded, the first fingerprint is removed. If that fingerprint later appears in pending_fingerprints again—for example after a long-lived or compacted pending turn—the store reports it as undelivered and sends it again. A fixed limit is only safe if the caller guarantees that pending fingerprints can never be older than the retained window; otherwise retain all fingerprints needed by the delivery contract or persist a monotonic turn boundary that makes old fingerprints impossible to reappear.
[RULE] unbounded-deduplication ·
| // disk) before spawning, so two calls on one resumed thread cannot both | ||
| // send the same turn. The claim is released if the turn fails. | ||
| let pending = pending_fingerprints(ctx.messages); | ||
| let (delivered, claim) = if is_new || !ctx.persist_session { |
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Release claims before retrying a missing session
The missing-session recovery path recursively calls run_turn after clearing the session, but this claim remains alive until the outer call returns. The recursive call therefore sees the same fingerprints as in-flight and can replace the original user input with the already-delivered notice instead of retrying the actual turn. Explicitly release or invalidate the claim before entering the recovery retry.
[RULE] stale-delivery-claim ·
| let (already, claim) = ctx.session_store.claim_delivered(&ctx.thread_id, &pending); | ||
| (already, Some(claim)) | ||
| }; | ||
| let stdin_bytes = build_stdin_with_delivered(ctx.messages, is_new, &delivered); |
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Do not replace an already delivered turn with a user notice
When all pending fingerprints are marked delivered, this builder emits a synthetic notice as stdin rather than sending no user turn. Claude receives that notice as a new user message, which can create an extra assistant response or cause the notice to be treated as user content. The resumed-session path should continue the existing session without injecting a replacement user turn, or use a protocol mechanism that does not add user input.
[RULE] synthetic-user-input ·
| struct StoreFile { | ||
| /// thread_id → CC session uuid (v4) | ||
| sessions: HashMap<String, String>, | ||
| /// thread_id → fingerprints of user turns already delivered to that |
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Make fingerprints stable across compacted pending turns
The persisted key is whatever pending_fingerprints currently emits. If pending turns are compacted or rebuilt and that operation changes the fingerprint, the same logical turn will no longer match the stored entry and will be sent again. Define the fingerprint from a stable turn identity that survives compaction, or persist that identity alongside the fingerprint.
[RULE] unstable-delivery-fingerprint ·
| Ok(true) | ||
| } | ||
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| fn persist(&self, guard: &StoreFile) -> std::io::Result<()> { |
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Persist a fingerprint stable across pending-turn compaction
The store has no independent identity for a pending turn; it persists only the transient fingerprint supplied by the caller. Reconstructing the pending list after compaction can change that value and bypass deduplication. Persist a stable turn id or use a canonical fingerprint derived from it.
[RULE] unstable-delivery-fingerprint ·
| // Validate input *before* spawning so we don't launch a process we | ||
| // can't feed (CodeRabbit: validate before spawn). | ||
| let stdin_bytes = build_stdin(ctx.messages, is_new); | ||
| // Reserve this call's pending turns atomically (per store, re-read from |
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Qualify the no-duplicate-delivery claim as process-local
The comment asserts "two calls on one resumed thread cannot both send the same turn", but the reservation is explicitly process-local (IN_FLIGHT is a static, and session_store.rs documents "Separate OS processes are not locked against each other"). Two OS processes sharing the same workspace and thread — the exact scenario this feature exists for — can still both spawn the CLI and deliver the same turn, and no test in the diff pins the multi-process case. The store-level serialization was added in this revision, which resolved the earlier store findings; what remains is this overclaiming comment at the driver. Soften it to match what the code guarantees, or add an inter-process lock (e.g. an flock on <store>.lock held across claim→record) if cross-process callers are real.
[RULE] unpinned-invariant ·
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What
One Claude session is kept per thread and shared by every caller on it (the provider's services, loop iterations). Each resumed call rebuilt its input from its own history (all user turns after the last assistant reply) with no record of what the session had already received, so N calls delivered the same trailing user turn N times.
Fix: track what each session has received and send only the delta.
session_storekeeps, per thread, a bounded (256) set of fingerprints of delivered user turns, persisted inclaude-code-sessions.json(#[serde(default)], so old files load). A replacement session UUID resets it.input_builderfingerprints each pending user turn as sha256(preceding assistant reply, index among turns pending after it, text). It is not tied to absolute history position, so services holding different slices of one thread (or a compacted one) agree, while a user repeating "continue" after a new assistant reply is a new turn.build_stdin_with_delivereddrops already-delivered turns. If all pending turns were delivered, it sends a one-line notice (the latest message was already delivered; respond to it) so the CLI still produces an answer without seeing the text twice.driver::run_turnrecords the pending turns after a successful turn (so a failed turn is retried in full rather than lost).Design choice to review
I chose the delta approach over keying sessions per service because the provider only sees
metadata.thread_id; it has no caller/service identity, so per-service keying would need a host change too (and would split context). The two are not exclusive; a host could still pass a service-scoped thread id.Known limits: services whose histories diverge before the user turn (different preceding assistant reply) get different fingerprints and are not deduplicated; the notice sent when everything was already delivered is a new, small piece of prompt text.
Tests
driver_tests: fakeclaudeshell script logs stdin; three calls on one thread with the same pending turn deliver its text once and still run the CLI three times. Fails without the fix (text delivered 3 times, checked by passing an empty delivered set).input_builder_tests: skip delivered turn; send only the new turn of a queued group; same words after a new reply are new; fingerprints independent of history position; new session ignores the set; no fingerprints unless the last turn is the user's.session_store_tests: persistence, reset on new UUID, bound.cargo test -p tinyagents-harness --lib claude_code: 89 passedcargo test -p tinyagents-integration-tests --test dependency_boundary: 6 passed (line baseline updated; the history contains one intermediate commit where the baseline file was malformed, fixed in the next commit)cargo fmt --check,cargo clippy -p tinyagents-harness --all-targets: cleanSame files as #360, #361 and #363 (stdout errors, #5712); expect mechanical conflicts in
driver.rsand the baseline line numbers. For tinyhumansai/openhuman#5877.Summary by CodeRabbit