Require structured final reports for agent turns - #1413
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Co-authored-by: Jimmy <1fe240cd1a8cf775f6f3060f115e5a303181f3abf28ad4cb0c2515f4a02b36a8@meshllm.communities.buzz.xyz> Signed-off-by: Jimmy <1fe240cd1a8cf775f6f3060f115e5a303181f3abf28ad4cb0c2515f4a02b36a8@meshllm.communities.buzz.xyz>
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Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: ⚪ Minimal · up to This PR adds an opt-in structured final-report contract while preserving existing behavior for requests without it; no actionable merge-blocking risk remains after normal checks and review. Sequence Diagram(s)sequenceDiagram
participant Client
participant ChatGuardrails as openai-frontend chat handling
participant Gateway as mesh-mixture-of-agents handle_turn
participant Contract as CollaborationContract
Client->>ChatGuardrails: non-streaming chat request
ChatGuardrails->>Contract: parse mesh_collaboration
ChatGuardrails->>Gateway: dispatch validated request
Gateway->>Contract: finalize_openai_response_value
Gateway-->>ChatGuardrails: finalized response or invalid result
ChatGuardrails-->>Client: tool-call response or error response
Suggested reviewers: 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Actionable comments posted: 2
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Inline comments:
In `@crates/mesh-llm-guardrails/src/collaboration.rs`:
- Around line 230-260: Update the collaboration finalizers so report-required
terminal-state validation and rewriting apply to every completion choice, or
reject responses containing multiple choices; do not process only the first
choice. Make the corresponding change in
crates/mesh-llm-guardrails/src/collaboration.rs lines 230-260 and
crates/openai-frontend/src/guardrails/mod.rs lines 336-362, preserving
collaboration_calls_output_tool and contract.final_arguments behavior. Add
coverage in crates/openai-frontend/src/guardrails/tests.rs lines 1426-1524 for
multiple prose choices and mixed terminal/tool-call choices.
In `@crates/openai-frontend/src/guardrails/mod.rs`:
- Around line 97-101: Update the collaboration request path to remove
mesh_collaboration handling and call
GuardrailEngine::guarded_chat_completion(request, context) instead of the
backend directly, then pass that guarded response to
finalize_collaboration_response.
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📒 Files selected for processing (6)
crates/mesh-llm-guardrails/src/collaboration.rscrates/mesh-llm-guardrails/src/lib.rscrates/mesh-mixture-of-agents/src/gateway.rscrates/openai-frontend/src/guardrails/mod.rscrates/openai-frontend/src/guardrails/tests.rsdocs/specs/mesh-collaboration-report.md
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This is still in draft |
Co-authored-by: Jimmy <1fe240cd1a8cf775f6f3060f115e5a303181f3abf28ad4cb0c2515f4a02b36a8@meshllm.communities.buzz.xyz> Signed-off-by: Jimmy <1fe240cd1a8cf775f6f3060f115e5a303181f3abf28ad4cb0c2515f4a02b36a8@meshllm.communities.buzz.xyz>
ndizazzo
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ndizazzo
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Needs revision. MoA streaming and repeated report turns both have blocking correctness problems.
Follow-ups:
- Validate locked nested arguments against the full declared schema.
- Treat
tool_calls: []as a final prose response that still needs the report call. - Parse invalid contracts before worker/reducer execution so MoA returns the same 400 as the direct backend.
- The branch is currently conflicting with main. Conflict resolution needs fresh Linux coverage.
| .await | ||
| } | ||
| }; | ||
| if let Some(raw_contract) = body.get(mesh_llm_guardrails::MESH_COLLABORATION_FIELD) { |
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The host removes stream before handle_turn, so this code can't tell that the request was streaming. It finalizes the MoA result instead of rejecting the unsupported contract. Chat SSE can emit the synthesized report call, and Responses SSE can finish with empty output. Please preserve the streaming intent and reject before worker/reducer execution.
| message.insert( | ||
| "tool_calls".into(), | ||
| serde_json::json!([{ | ||
| "id":"call_mesh_collaboration", |
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Every synthesized report reuses this fixed tool-call ID. On a later turn, the session matches the tool result to the first pending call with that ID, which can overwrite the old result and leave the new call unresolved. Please generate a unique ID for each report call and add a multi-turn regression test.
i386
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i386
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Reviewed the contract design and both integration points. This looks good — approving.
What I verified:
- Fail-closed semantics throughout: undeclared/duplicate tool, non-string body argument, body_argument also locked, schema-rejected locked arguments, and multi-choice or malformed outputs all produce explicit errors rather than passing garbage through.
- Pass-through behavior for intermediate tool calls is preserved in both the gateway (
Ok(false)no-op) and the guarded backend, so agent loops that investigate before reporting keep working. - Model-supplied arguments can never override locked routing values (
final_argumentsrebuilds from locked + body only). - No-contract requests are byte-for-byte unchanged, and streaming is explicitly rejected (documented in the spec).
- Tests cover the four key paths: prose wrapping with locked values, multi-choice rejection, absent contract, and intermediate tool-call pass-through; the spec doc matches the implementation.
One merge-gate note: the red CI runs on the current head are infra cancellations (sccache connection refused → "The operation was canceled"), not test failures — none of the failure logs contain a failing assertion. Please re-run the Linux lane before merging so it lands with a green required check.
| None => Map::new(), | ||
| }; | ||
| let body = native_arguments | ||
| .get(&report.body_argument) |
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Non-blocking note from my review: the natural place for a future "retry-without-locked-arguments" behavior to hook in is final_arguments — if a caller ever wants to let the model retry a missing report body rather than fail closed, keep the fail-closed default and make any retry explicit at the gateway layer, so the locked-routing guarantee can't be weakened by a refactor here.
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3 participants
Summary
Callers can opt a non-streaming chat turn into a versioned
report_requiredcontract. Intermediate tool calls continue normally, while terminal prose or a native final-report proposal becomes one structured report tool call with caller-locked arguments.The final argument object is rebuilt from only the report body and locked values, so models cannot widen side effects or alter routing. Requests without the extension remain unchanged. Collaboration requests remain inside the configured guardrail flow, and responses with zero or multiple choices fail closed.
Architecture
mesh-llm-guardrails.model=meshMoA gateway.API
Validation
At
ed297f768f27ac7e47d1aac76fcaf509e0bd4a42:cargo test -p mesh-llm-guardrails --lib— 18 passedcargo test -p openai-frontend --lib— 188 passedcargo test -p mesh-mixture-of-agents --lib— 198 passedcargo clippy -p mesh-llm-guardrails --all-targets -- -D warningscargo clippy -p openai-frontend --all-targets -- -D warningscargo clippy -p mesh-mixture-of-agents --all-targets -- -D warningscargo fmt --all -- --checkQwen3-8B feasibility probe
Using local Qwen3-8B Q4_K_M with reasoning disabled and a 256-token cap:
report_requiredThe baseline invented route values. The contract retained the useful semantic body and deterministically enforced caller-authoritative routing. A forced-prose probe also exposed the boundary: textual tool markup can become a structurally valid but polluted report body, so the API guarantees shape/routing, not prose quality.
Summary by CodeRabbit
New Features
Bug Fixes
Documentation