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fix(observability): correlate Responses tool calls in ATIF - #887

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@afourniernv

@afourniernv afourniernv commented Aug 25, 2026 •

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Overview

Fixes ATIF tool-result correlation for OpenAI Responses function calls.

OpenAI Responses uses two different identifiers on a function-call output item: id identifies the response item (fc_*), while call_id identifies the tool invocation and is reused by function_call_output. The exporter previously selected id first, so Relay could emit the agent tool call as fc_* while the corresponding tool observation used call-*. That left a valid result orphaned in the exported trajectory.

  • I confirm this contribution is my own work, or I have the right to submit it under this project's license.
  • I searched existing issues and open pull requests, and this does not duplicate existing work.

Details

  • Tracks whether tool calls came from generic/OpenAI Chat, OpenAI Responses, or Anthropic Messages output.
  • Selects call_id, then id, then tool_call_id only for Responses function-call items.
  • Preserves id, then tool_call_id, then call_id precedence for Chat, Anthropic, and generic payloads while allowing null, empty, and non-string values to fall through to a valid fallback.
  • Preserves compatible fallbacks for absent, null, empty, and non-string Responses call_id values.
  • Adds a regression in the real ordering where a tool finishes before the delayed terminal LLM event.
  • Adds multiple-call, fallback, mixed-shape precedence, and provider non-regression coverage.

This changes a conforming Responses ATIF tool_call_id from the response-item fc_* ID to the semantic call-* invocation ID. That is the intended corrective behavior and allows Step.tool_calls[].tool_call_id to match Step.observation.results[].source_call_id.

Validation

  • cargo test -p nemo-relay --lib observability::atif::tests — 102 passed
  • cargo clippy -p nemo-relay --all-targets --all-features -- -D warnings
  • cargo fmt --all -- --check
  • just test-rust — full workspace, FFI serial pass, doctests, and Rust examples passed
  • Live Codex CLI -> current Relay -> NVIDIA OpenAI-compatible Responses endpoint: the raw item retained id=fc_*, while both exported tool call and observation used the same call-* ID

Where should the reviewer start?

Start with extract_tool_calls and tool_call_id_for_origin in crates/core/src/observability/atif.rs, then the realistic Responses regression in test_exporter_openai_responses_function_calls_promoted_and_correlated.

Related Issues: (use one of the action keywords Closes / Fixes / Resolves / Relates to)

Summary by CodeRabbit

  • New Features

    • Tool-call records now identify whether they originated from generic/OpenAI Chat, OpenAI Responses, or Anthropic Messages formats.
    • OpenAI Responses tool results now correlate using the call ID when available, improving support for delayed completions and invocation identifiers.
  • Bug Fixes

    • Preserved provider-specific ID behavior and prioritized standard tool-call data when multiple response formats are present.
  • Documentation

    • Clarified supported formats and tool-call correlation behavior.

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afourniernv requested a review from a team as a code owner August 25, 2026 00:16
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@github-actions github-actions Bot added size:M PR is medium Bug issue describes bug; PR fixes bug lang:rust PR changes/introduces Rust code labels Aug 25, 2026
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crates/core/src/observability/atif.rs (1)

1153-1181: LGTM!

Also applies to: 1217-1250


Walkthrough

Tool-call extraction now records payload origin and applies provider-specific identifier precedence for generic, OpenAI Chat, OpenAI Responses, and Anthropic Messages formats. Tests cover fallbacks, ordering, and mixed payload selection.

Changes

Tool-call correlation

Layer / File(s) Summary
Origin-aware tool-call extraction
crates/core/src/observability/atif.rs
extract_tool_calls classifies payload origins. OpenAI Responses prioritizes call_id, then falls back to id and tool_call_id. Generic and Anthropic payloads retain their existing precedence.
Correlation and ordering coverage
crates/core/tests/unit/atif_tests.rs
Tests cover Responses fallbacks, delayed tool completion, provider-specific ID semantics, and preference for generic tool_calls over Responses output.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Merge Risk: ⚪ Minimal · up to a57fc

This change corrects Responses tool-call correlation so exported tool calls and observations share the semantic invocation ID; no actionable merge-blocking risk remains after normal checks and review.

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Actionable comments posted: 1

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In `@crates/core/src/observability/atif.rs`:
- Around line 1239-1244: Update the ToolCallOrigin::Generic and
ToolCallOrigin::AnthropicMessages extraction in the relevant tool-call ID
function to use find_map, so null, empty, and non-string id values continue
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Comment thread crates/core/src/observability/atif.rs Resolved
Signed-off-by: Alex Fournier <afournier@nvidia.com>
Signed-off-by: Alex Fournier <afournier@nvidia.com>
@willkill07
willkill07 changed the base branch from main to release/0.8 August 25, 2026 13:43
@willkill07
willkill07 requested a review from a team as a code owner August 25, 2026 13:43
@github-actions github-actions Bot added size:L PR is large and removed size:M PR is medium labels Aug 25, 2026
@willkill07
willkill07 changed the base branch from release/0.8 to main August 25, 2026 13:43
@github-actions github-actions Bot added size:M PR is medium and removed size:L PR is large labels Aug 25, 2026
@afourniernv
afourniernv force-pushed the feat/atif-responses-call-id branch from f023443 to a57fc57 Compare August 25, 2026 13:47
@afourniernv afourniernv added this to the 0.8 milestone Aug 25, 2026
@afourniernv
afourniernv changed the base branch from main to release/0.8 August 25, 2026 13:47
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/ok to test a57fc57

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⚠️ Report is 1 commits behind head on release/0.8.

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@@             Coverage Diff              @@
##           release/0.8     #887   +/-   ##
============================================
  Coverage        94.27%   94.27%           
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  Files              328      328           
  Lines           109624   109642   +18     
  Branches           135      135           
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+ Hits            103345   103364   +19     
+ Misses            6279     6278    -1     
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Python Binding 95.19% <ø> (-0.04%) ⬇️
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crates/core/src/observability/atif.rs 99.06% <100.00%> (+0.01%) ⬆️

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rapids-bot Bot merged commit b464b33 into release/0.8 Aug 25, 2026
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@willkill07
willkill07 deleted the feat/atif-responses-call-id branch September 4, 2026 23:41
svcnemo-autobot pushed a commit to svcnemo-autobot/Gym that referenced this pull request Sep 18, 2026
## What does this PR do?

Adds a bounded ATIF v1.7 input path to `gym eval reverify`, allowing
completed Relay trajectories to be scored by Gym's existing stateless
verifier flow without rerunning the agent or policy model.

Together, NVIDIA-NeMo#2737 and NVIDIA-NeMo#2767 establish a file-based interoperability path
between NeMo Relay and NeMo Gym. Relay-exported ATIF trajectories can be
evaluated in Gym, while Gym-native trajectories can be exported to the
same ATIF format for downstream consumers. This does not couple the
Relay and Gym runtimes or add Relay as a Gym dependency.

Relates to NVIDIA-NeMo#2468.

## Before

`gym eval reverify` only accepted native Gym rollout JSONL.

ATIF contains the external agent trajectory, but not the Gym task,
expected answer, verifier configuration, or resources-server routing
needed to calculate a reward.

## After

```bash
gym eval reverify \
  --input-format atif \
  --config my_resources_server.yaml \
  --inputs materialized-inputs.jsonl \
  --atif-manifest relay-trajectories.jsonl \
  --output rewards.jsonl
```

The inputs have separate responsibilities:

- Materialized Gym inputs provide the task, verifier metadata, request
context, and routing.
- ATIF provides the completed external-agent output.
- The manifest explicitly joins each trajectory to `(_ng_task_index,
_ng_rollout_index)` and may pin its SHA-256.

Gym projects the supported ATIF output into its existing
Responses-shaped verifier payload, calls the normal stateless `/verify`
path, and computes aggregate metrics.

## Integration contract

Gym consumes the canonical ATIF fields needed to build that bounded
scoring payload. It does not reconstruct provider-native payloads stored
in optional `extra` metadata; the ATIF producer owns that conversion.

`projection_status=complete` means Gym constructed the supported
verifier payload without guessing or dropping a field the adapter maps.
It does not claim full-document ATIF fidelity, certify the producer's
provider-to-ATIF conversion, or interpret arbitrary producer metadata.
Persisted source and trajectory hashes retain that provenance.

Supported in this initial path:

- exact ATIF v1.7 schema and text-only trajectories;
- canonical agent text and `reasoning_content`;
- generic function calls with exactly one correlated result per call;
- standard token usage and supported Relay usage details;
- explicit one-to-one trajectory/task joins with optional source-hash
verification; and
- persisted trajectory ID, session ID, schema version, source hash, and
projection status.

Standard usage is strict. If any model step reports supported usage,
every model-backed step must provide `prompt_tokens` and
`completion_tokens`, and `final_metrics` must provide matching totals.
Optional cached, reasoning, and reported-total details are projected
only when their aggregate can be proven. Partially reported optional
details remain unknown rather than being counted as zero. Equivalent
Relay reasoning-token aliases are normalized, conflicting aliases are
rejected, and cost metadata remains provenance rather than verifier
input.

The path fails closed on shapes that cannot be mapped without changing
what the verifier scores, including:

- multimodal, continued, copied-context, or subagent trajectories;
- later user or system input after agent output;
- aggregated LLM calls or ambiguous message/tool ordering;
- incomplete, duplicated, or uncorrelated tool calls and results; and
- training token IDs or log probabilities.

Optional producer-specific status or provider payloads in `extra` do not
change the canonical projection. A trajectory may end after a tool call
when every call has a correlated observation result.

Tool-bearing ATIF is rejected when routed to a resources server with
`expose_tools_over_mcp: true`. ATIF proves generic call/result
correlation, but does not carry Gym's canonical MCP `(server_name,
tool_name)` identity.

ATIF mode requires the verifiers selected by the batch to be stateless
and does not support `--force`, `--resume`, `--judge-failed-only`, or
`--append`.

Native Gym reverification remains the default. This adds no Relay, NeMo
Agent Toolkit, or Harbor runtime dependency.

## Suggested review order

Most of the added lines are qualification tests and fixtures. The
maintainer-facing behavior is concentrated in these areas:

| Review area | Files | What to verify |
| --- | --- | --- |
| Strict ATIF boundary | `nemo_gym/atif_v1_7.py`,
`nemo_gym/atif_json.py` | Exact v1.7/schema and lossless JSON rules |
| Projection | `nemo_gym/atif_reverification.py` | Supported trajectory
mapping, usage semantics, identity, and fail-closed boundaries |
| Gym integration | `nemo_gym/rollout_reverification.py` |
Selected-route preflight and reuse of the existing stateless verifier
path |
| Wiring and evidence | CLI, docs, fixtures, and tests | User-facing
contract and regression coverage |

Suggested pass: review the boundary first, then projection, then the
small Gym integration. The remaining files document and prove that
contract.

## Validation

- Focused ATIF projection, rollout-reverification, and CLI suites: **491
passed**.
- Changed-file pre-commit and `git diff --check`: passed.
- Fixture tests prove reward equivalence between native and projected
responses and show that the same ATIF trajectory can be rescored with a
second stateless verifier.
- The live Codex CLI → Relay → ATIF → Gym check executed a real tool
call, preserved `function_call → function_call_output → message`, and
returned reward `1.0` with aggregate accuracy `100%`.

The broader local unit run reported the same five failures in both ATIF
worktrees, all outside the affected paths: sandbox port binding,
existing `aime24` metadata, macOS `/proc` behavior, system Python
missing `aiohttp`, and sandbox semaphore permissions. The affected
suites pass.

## Related work

- NVIDIA-NeMo#2468 tracks ATIF input for Gym reverification.
- NVIDIA/NeMo-Relay#887 fixes Responses tool-call correlation.
- NVIDIA-NeMo#2673 covers Gym-native structured MCP tool identity and is
complementary to this PR.

## Checklist

- [x] I have read the contributing guidelines.
- [x] The change is focused and adds no unrelated runtime dependency.
- [x] Tests and documentation were added.
- [x] Changed-file pre-commit checks pass.
- [x] Commits include DCO sign-off.

---------

Signed-off-by: Alex Fournier <afournier@nvidia.com>

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