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feat: model nested DeepAgents agent scopes - #808

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feat: model nested DeepAgents agent scopes#808
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enh/deepagents-agent-scopes

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@bbednarski9 bbednarski9 commented Aug 19, 2026

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Overview

Model Deep Agents orchestrators and supported in-process subagents as semantic NeMo Relay Agent scopes using the maintained callback lifecycle.

  • 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

  • Identify semantic Deep Agents orchestrator and subagent runs from public callback metadata while excluding internal LangGraph node runs from the semantic Agent topology.
  • Add explicit integration, deepagents_agent_name, and deepagents_agent_role scope metadata.
  • Preserve the existing callback handler's deferred LIFO completion and error handling, along with managed model/tool execution and Deep Agents marks.
  • Add sync and async coverage for caller-provided declarative subagents and the generated general-purpose subagent, including scope parentage and error closure.
  • Document the supported declarative, generated, precompiled, and remote instrumentation boundaries.

Validation:

  • uv run --extra deepagents pytest python/tests/integrations/deepagents_tests/test_deepagents_integration.py -q — 16 passed
  • just test-python — 684 passed
  • just docs-linkcheck — passed
  • Targeted pre-commit hooks — passed
  • All-files pre-commit passed except cargo deny, which reports RUSTSEC-2026-0258 for the existing h2 0.4.13 entry; this branch does not modify Cargo.lock.

Where should the reviewer start?

Start with NemoRelayDeepAgentsCallbackHandler.on_chain_start in python/nemo_relay/integrations/deepagents/callbacks.py, then review the semantic topology E2E assertions in python/tests/integrations/deepagents_tests/test_deepagents_integration.py.

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

Summary by CodeRabbit

  • New Features

    • Improved Deep Agents observability with clearer orchestrator and subagent scopes.
    • Added visibility into generated general-purpose subagents and their related model and tool activity.
    • Enhanced metadata and parent-child relationships for agent execution traces.
  • Documentation

    • Clarified verification requirements and instrumentation guidance for local, precompiled, remote, and separately executed subagents.
  • Bug Fixes

    • Improved handling and closure of agent scopes when errors occur.

Signed-off-by: Bryan Bednarski <bbednarski@nvidia.com>
@github-actions github-actions Bot added size:M PR is medium Improvement improvement to existing functionality lang:python PR changes/introduces Python code labels Aug 19, 2026
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Review Change Stack

Walkthrough

Deep Agents now emits semantic Agent scopes for the orchestrator and supported in-process subagents. The callback assigns names, roles, metadata, and parentage. Tests cover synchronous, asynchronous, general-purpose, error, and model-scope behavior. Documentation defines instrumentation boundaries.

Changes

Deep Agents semantic scopes

Layer / File(s) Summary
Semantic callback scope creation
python/nemo_relay/integrations/deepagents/callbacks.py
The callback identifies Deep Agents orchestrators and subagents, adds role and integration metadata, normalizes scope names, and forwards lifecycle events to the LangGraph handler.
Scope lifecycle and end-to-end validation
python/tests/integrations/deepagents_tests/test_deepagents_integration.py
Tests cover semantic scope filtering, nested parentage, metadata, error closure, synchronous and asynchronous runs, and general-purpose subagent model parenting.
Integration contract documentation
docs/supported-integrations/deepagents.mdx
The guide documents main-agent and nested subagent scopes, internal LangGraph boundaries, and instrumentation requirements for generated, precompiled, remote, and separate subagents.

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

Merge Risk: 🟡 Moderate · up to d359f

The callback can expose internal LangGraph node runs as semantic Agent scopes when their names differ from the configured agent name, producing inaccurate nested topology in traces. Merge should wait for the filtering fix and regression coverage for mismatched names and name=None.

Sequence Diagram(s)

sequenceDiagram
  participant DeepAgents
  participant NemoRelayDeepAgentsCallbackHandler
  participant LangGraphCallbackHandler
  participant RelayAgentScopes
  DeepAgents->>NemoRelayDeepAgentsCallbackHandler: Start orchestrator or subagent chain
  NemoRelayDeepAgentsCallbackHandler->>NemoRelayDeepAgentsCallbackHandler: Detect semantic agent and assign metadata
  NemoRelayDeepAgentsCallbackHandler->>LangGraphCallbackHandler: Forward enriched lifecycle event
  LangGraphCallbackHandler->>RelayAgentScopes: Create nested Agent scope
  RelayAgentScopes-->>DeepAgents: Record scoped model and tool events
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🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name Status Explanation Resolution
Docstring Coverage ⚠️ Warning Docstring coverage is 9.09% which is insufficient. The required threshold is 80.00%. Write docstrings for the functions missing them to satisfy the coverage threshold.
✅ Passed checks (4 passed)
Check name Status Explanation
Title check ✅ Passed The title follows Conventional Commits format and accurately summarizes the nested DeepAgents scope change.
Description check ✅ Passed The description includes all required sections, implementation details, reviewer guidance, validation results, and a linked issue.
Linked Issues check ✅ Passed The changes address issue #805 by adding nested semantic scopes, lifecycle handling, tests, and instrumentation boundary documentation.
Out of Scope Changes check ✅ Passed The changes remain within issue #805 and cover the requested callback logic, tests, and DeepAgents documentation.
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@bbednarski9
bbednarski9 marked this pull request as ready for review August 19, 2026 05:00
@bbednarski9
bbednarski9 requested review from a team as code owners August 19, 2026 05:00

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Inline comments:
In `@docs/supported-integrations/deepagents.mdx`:
- Around line 97-99: Update the deepagents scope documentation to state that
nested Agent scope names are derived from callback metadata, including the
DeepAgent fallback, rather than implying they always use a configured subagent
type. Preserve the existing description of the semantic main-agent scope.

In `@python/nemo_relay/integrations/deepagents/callbacks.py`:
- Around line 70-75: Update _semantic_agent_name so LangGraph node runs are
excluded before evaluating the configured_name/lc_agent_name match; when
metadata contains langgraph_node, return no agent scope even if both names are
"main-agent". Preserve the existing configured-name and DeepAgent fallback
behavior for non-node runs, and add a regression test covering both fields set
to "main-agent".

In `@python/tests/integrations/deepagents_tests/test_deepagents_integration.py`:
- Around line 791-798: Update the generated subagent graph setup so callback
context is propagated into the general-purpose subagent, preserving its model
instrumentation. In the test assertions around main-agent and general-purpose
lifecycle events, expect mock-model parentage in the order main-agent,
general-purpose, and main-agent.
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📚 Learning: 2026-08-12T17:13:14.808Z
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Repo: NVIDIA/NeMo-Relay PR: 755
File: python/tests/integrations/langchain_tests/test_callbacks_scope_stack.py:185-185
Timestamp: 2026-08-12T17:13:14.808Z
Learning: In Python files, do not report Ruff UP017 findings unless pyproject.toml enables the UP rule set or the individual file explicitly enables UP017. The repository currently enables Ruff rule sets E, F, W, and I only.

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python/tests/integrations/deepagents_tests/test_deepagents_integration.py

[warning] 742-742: Boolean-typed positional argument in function definition

(FBT001)

python/nemo_relay/integrations/deepagents/callbacks.py

[warning] 21-21: Dynamically typed expressions (typing.Any) are disallowed in *args

(ANN401)


[warning] 21-21: Dynamically typed expressions (typing.Any) are disallowed in **kwargs

(ANN401)


[warning] 34-34: Dynamically typed expressions (typing.Any) are disallowed in **kwargs

(ANN401)


[warning] 35-35: Dynamically typed expressions (typing.Any) are disallowed in on_chain_start

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🔇 Additional comments (1)
docs/supported-integrations/deepagents.mdx (1)

111-128: LGTM!

Comment thread docs/supported-integrations/deepagents.mdx Outdated
Comment thread python/nemo_relay/integrations/deepagents/callbacks.py
@bbednarski9 bbednarski9 self-assigned this Aug 19, 2026
@bbednarski9 bbednarski9 added this to the 0.8 milestone Aug 19, 2026
Signed-off-by: Bryan Bednarski <bbednarski@nvidia.com>
@bbednarski9 bbednarski9 changed the title enhancement: model nested DeepAgents agent scopes feat: model nested DeepAgents agent scopes Aug 19, 2026
@github-actions github-actions Bot added Feature a new feature and removed Improvement improvement to existing functionality labels Aug 19, 2026

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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents
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Inline comments:
In `@python/nemo_relay/integrations/deepagents/callbacks.py`:
- Around line 70-71: Update the _semantic_agent_name condition so it returns
early only when langgraph_node is non-None and matches name; when both are None,
continue to the existing "deepagents" fallback. Add a regression test covering
on_chain_start with name=None and absent langgraph_node.
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**/*.mdx

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MDX top-of-file SPDX comments must use {/* ... */} delimiters instead of HTML comment delimiters (Must-Fix)

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{/* to open and */} to close. Do not use HTML comments for MDX SPDX
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Format UI buttons, menus, fields, and labels in bold, and separate consecutive UI navigation labels with >.
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Format definition lists with a bold term followed by a complete, parallel, punctuated definition.
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Python worker plugin examples, and grpc-v1 protocol details on separate
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📄 CodeRabbit inference engine (CONTRIBUTING.md)

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**/*: Tool execution callbacks and each execution-intercept next continuation
return the canonical ToolExecutionResult { result, annotation }. A forwarding
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Tool sanitize-response guardrails receive
only result.

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  • Ordering by priority
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  • Scope-local registration, inheritance, and cleanup on pop
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Preserve the framework's original behavior when NeMo Relay is absent
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python/tests/**/*.py: Use pytest to run Python tests.
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When mocking a class, use unittest.mock.MagicMock or unittest.mock.AsyncMock, using spec when necessary, rather than defining a new class.
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Follow binding naming conventions: Rust and Python snake_case, C FFI exports prefixed nemo_relay_, Go PascalCase for public APIs, Node.js camelCase.

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📄 CodeRabbit inference engine (CONTRIBUTING.md)

**/*.py: Linting: Ruff with rule sets E, F, W, I
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**/*.{rs,py,go,js,ts}: - [ ] Do all bindings expose the same logical knobs and semantics?

  • Does every OpenTelemetry endpoint require a type and nonblank destination?
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  • Are OpenTelemetry and OpenInference dependencies unconditional rather
    than Cargo feature-gated?
  • Does enable_full_payloads preserve complete sanitized LLM request input
    and annotations while leaving credential removal and sanitizers active?
  • Does Relay derive compliant trace and span IDs consistently across typed
    OpenTelemetry endpoints while preserving lifecycle parentage?
  • Are mark events, start/end events, and orphan cases still handled correctly?
  • Do examples and docs use each exporter's documented flush/deregister
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  • Run the affected Rust crate tests plus just test-rust if event
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  • Run just test-python, just test-go, and just test-node when
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**/*.{py,pyi}: 3. Language-native bindings
Update Python, Go, and Node.js for every surface that should expose the
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| Python | snake_case | nemo_relay.tools.call |

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**/*.{rs,py,pyi,go,js,ts}: 6. Validation
Run the validation matrix from the validate-change skill for the affected
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Files:

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{crates,python}/**/*.{rs,py}

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Rust and Python SDKs expose every supported registration surface.

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**/*.{py,rs,go,js,jsx,ts,tsx}

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{crates/**/tests/**,python/tests/**,go/nemo_relay/**/*_test.go}

⚙️ CodeRabbit configuration file

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Files:

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🧠 Learnings (1)
📚 Learning: 2026-08-12T17:13:14.808Z
Learnt from: SandyChapman
Repo: NVIDIA/NeMo-Relay PR: 755
File: python/tests/integrations/langchain_tests/test_callbacks_scope_stack.py:185-185
Timestamp: 2026-08-12T17:13:14.808Z
Learning: In Python files, do not report Ruff UP017 findings unless pyproject.toml enables the UP rule set or the individual file explicitly enables UP017. The repository currently enables Ruff rule sets E, F, W, and I only.

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🔇 Additional comments (3)
python/nemo_relay/integrations/deepagents/callbacks.py (1)

18-59: LGTM!

python/tests/integrations/deepagents_tests/test_deepagents_integration.py (1)

462-541: LGTM!

docs/supported-integrations/deepagents.mdx (1)

97-99: LGTM!

Comment thread python/nemo_relay/integrations/deepagents/callbacks.py Outdated
Signed-off-by: Bryan Bednarski <bbednarski@nvidia.com>

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Inline comments:
In `@python/nemo_relay/integrations/deepagents/callbacks.py`:
- Around line 70-72: Update the filtering logic in the callback scope handling
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Files:

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Keep SPDX headers on source, docs, scripts, and configuration files. The project is Apache-2.0.

Files:

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**/*.{rs,py}

📄 CodeRabbit inference engine (AGENTS.md)

Follow binding naming conventions: Rust and Python snake_case, C FFI exports prefixed nemo_relay_, Go PascalCase for public APIs, Node.js camelCase.

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  • python/tests/integrations/deepagents_tests/test_deepagents_integration.py
**/*.{rs,py,js,mjs,ts}

📄 CodeRabbit inference engine (AGENTS.md)

Keep async behavior on the existing tokio-based model. Bindings should preserve callback and future lifetimes rather than blocking or hiding async work unexpectedly.

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  • python/tests/integrations/deepagents_tests/test_deepagents_integration.py
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All source files must include an SPDX license header.

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**/*.py

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**/*.py: Linting: Ruff with rule sets E, F, W, I
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Type checking: ty

Use test-python-binding.

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**/*.{rs,py,go,js,ts}

📄 CodeRabbit inference engine (CONTRIBUTING.md)

**/*.{rs,py,go,js,ts}: Run tests for every language affected by your changes. If your change touches the core Rust crate, run tests across all bindings since they all depend on it.
When adding new functionality, include tests in the appropriate test files for each affected language binding.

**/*.{rs,py,go,js,ts}: - [ ] Do all bindings expose the same logical knobs and semantics?

  • Does every OpenTelemetry endpoint require a type and nonblank destination?
  • Does each endpoint resolve header_env values at activation and reject
    missing, blank, or duplicate headers?
  • Are OpenTelemetry and OpenInference dependencies unconditional rather
    than Cargo feature-gated?
  • Does enable_full_payloads preserve complete sanitized LLM request input
    and annotations while leaving credential removal and sanitizers active?
  • Does Relay derive compliant trace and span IDs consistently across typed
    OpenTelemetry endpoints while preserving lifecycle parentage?
  • Are mark events, start/end events, and orphan cases still handled correctly?
  • Do examples and docs use each exporter's documented flush/deregister
    order before shutdown?
  • Run the affected Rust crate tests plus just test-rust if event
    fields changed.
  • Run just test-python, just test-go, and just test-node when
    binding-native config or lifecycle changed.

Files:

  • python/nemo_relay/integrations/deepagents/callbacks.py
  • python/tests/integrations/deepagents_tests/test_deepagents_integration.py
**/*

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**/*: Every commit in a pull request must include a Developer Certificate of Origin sign-off.
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Use SONAR_IGNORE_START / SONAR_IGNORE_END only for documented false
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Keep the ignored block as small as possible, add a brief comment
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  • Relevant tests passed under validate-change

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  • Pull request title follows Conventional Commit style and uses the correct
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    Use Conventional Commit style for PR titles:
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**/*: Tool execution callbacks and each execution-intercept next continuation
return the canonical ToolExecutionResult { result, annotation }. A forwarding
intercept must preserve both fields in ToolExecutionInterceptOutcome; Relay
retains pending_marks separately.
Tool sanitize-response guardrails receive
only result.

  • Registration and duplicate-name behavior
  • Deregistration and no-op missing-name behavior
  • Ordering by priority
  • Callback failure policy, including fail-open behavior when required
  • Scope-local registration, inheritance, and cleanup on pop
  • Parity coverage in every affected binding

**/*: Keep NeMo Relay optional
Use stable, documented framework or plugin APIs
Wrap tool and LLM paths at the correct framework boundary
Preserve the framework's original behavior when NeMo Relay is absent
Integration uses public framework or plugin A...

Files:

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**/*.{py,pyi}

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**/*.{py,pyi}: 3. Language-native bindings
Update Python, Go, and Node.js for every surface that should expose the
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| Python | snake_case | nemo_relay.tools.call |

Files:

  • python/nemo_relay/integrations/deepagents/callbacks.py
  • python/tests/integrations/deepagents_tests/test_deepagents_integration.py
**/*.{rs,py,pyi,go,js,ts}

📄 CodeRabbit inference engine (.agents/skills/add-binding-feature/SKILL.md)

**/*.{rs,py,pyi,go,js,ts}: 6. Validation
Run the validation matrix from the validate-change skill for the affected
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  • Tests added in every affected language surface

Files:

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{crates,python}/**/*.{rs,py}

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Rust and Python SDKs expose every supported registration surface.

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**/*.{md,mdx,rs,py,go,js,ts}

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**/*.{py,rs,go,js,jsx,ts,tsx}

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python/tests/**/*.py: Use pytest to run Python tests.
Do not add @pytest.mark.asyncio to tests; async tests are automatically detected by the async runner.
Do not add a -> None return type annotation to test functions.
When mocking a class, use unittest.mock.MagicMock or unittest.mock.AsyncMock, using spec when necessary, rather than defining a new class.
Prefix mocked class names with mock, not fake.
Prefer pytest fixtures over helper methods.
If a fixture is needed in multiple test files, define it in a conftest.py file instead of repeating it.
Define fixtures using @pytest.fixture(name="<fixture_name>"[, scope="<scope>"]) and a <fixture_name>_fixture function; specify scope only when it is not function.
Prefer pytest.mark.parametrize over separate tests for different input types.
Run focused pytest tests first when the affected area is known, and run the full suite with just test-python before review.

Files:

  • python/tests/integrations/deepagents_tests/test_deepagents_integration.py
{crates/**/tests/**,python/tests/**,go/nemo_relay/**/*_test.go}

⚙️ CodeRabbit configuration file

{crates/**/tests/**,python/tests/**,go/nemo_relay/**/*_test.go}: Tests should cover the behavior promised by the changed API surface, including error paths and cross-request isolation where relevant.
Prefer assertions on lifecycle events, scope stacks, middleware ordering, and binding parity over shallow smoke tests.

Files:

  • python/tests/integrations/deepagents_tests/test_deepagents_integration.py
🧠 Learnings (1)
📚 Learning: 2026-08-12T17:13:14.808Z
Learnt from: SandyChapman
Repo: NVIDIA/NeMo-Relay PR: 755
File: python/tests/integrations/langchain_tests/test_callbacks_scope_stack.py:185-185
Timestamp: 2026-08-12T17:13:14.808Z
Learning: In Python files, do not report Ruff UP017 findings unless pyproject.toml enables the UP rule set or the individual file explicitly enables UP017. The repository currently enables Ruff rule sets E, F, W, and I only.

Applied to files:

  • python/nemo_relay/integrations/deepagents/callbacks.py
  • python/tests/integrations/deepagents_tests/test_deepagents_integration.py
🔇 Additional comments (2)
python/nemo_relay/integrations/deepagents/callbacks.py (1)

10-10: LGTM!

Also applies to: 19-19, 25-59, 61-69, 74-81

python/tests/integrations/deepagents_tests/test_deepagents_integration.py (1)

544-570: LGTM!

Comment thread python/nemo_relay/integrations/deepagents/callbacks.py
@bbednarski9

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Did some E2E testing here and confirmed the original failure case is patched. Merging, will address other issues with DeepAgents integration if they arise as follow ups

@bbednarski9

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/merge

@rapids-bot
rapids-bot Bot merged commit ca08901 into main Aug 19, 2026
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[Enhancement]: Model DeepAgents orchestrator and local subagents as nested Relay Agent scopes

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