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Relay derives ATIF session identity from the propagated root, so a root that changes per request makes every invocation its own session. A caller whose work spans several requests - a chat turn at a time, say - therefore had no way to land those turns in one session. An adapter now reads `relay_session_root` (exported as SESSION_ROOT_CONTEXT_KEY) from the run request context and uses it as the Relay propagation root, keeping the request as the parent. Each turn still gets its own trajectory; they share one session. Without a session root the root falls back to the request, which is the behaviour from NVIDIA#260. The key is deliberately not `session_id`: adapters already surface harness session ids of their own, and a caller sending one for unrelated reasons would have had its traces silently regrouped. A test pins that a plain `session_id` roots nothing. Validation lives in relay_request_context, the one function that talks to Relay, so a non-UUID root never reaches PropagationContext. An empty or malformed root falls back to the request root and is left out of the scope metadata instead of being recorded as if used. A Deep Agents test covers the adapter path end to end for both a UUID and a non-UUID root. This requires Relay 0.9, the first release where ATIF session identity comes from the propagation root (NVIDIA/NeMo-Relay#959); on 0.7 and 0.8 the session is the Agent scope's own event and a supplied root is ignored. Squashed from b91590f, b73f421, 2048446, 5792902 on relay-session-propagation-root/mschwab. Signed-off-by: mschwab <mschwab@nvidia.com>
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WalkthroughRelay request contexts now support a validated session UUID as the propagation root. DeepAgents, MiniSWE-Agent, and the custom LangGraph agent pass session-root values into Relay context construction. Tests cover UUID validation, propagation metadata, and parent selection. ChangesRelay session-root propagation
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant Runtime
participant common_utils
participant Relay
Runtime->>common_utils: Pass request ID and session root
common_utils->>Relay: Create propagation context from validated UUIDs
Merge Risk: 🔵 Low · up to Session grouping works, but the parent relationship is described incorrectly for non-UUID request IDs. The wording can be corrected without blocking merge. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 14.71% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 34 functions across 10 files. (8 skipped: 8 unsupported.) ✨ Finishing Touches🧪 Generate unit tests (beta)
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- Around line 800-835: Add focused session-root propagation coverage in the
mini-SWE-agent tests using the existing propagation_context stub. Provide
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🔇 Additional comments (4)
adapters/python/common/src/nemo_fabric_adapters/common/utils.py (1)
263-309: LGTM!tests/adapters/test_adapaters_common_utils.py (1)
92-199: LGTM!adapters/python/deepagents/src/nemo_fabric_adapters/deepagents/adapter.py (1)
738-738: LGTM!Also applies to: 811-811, 841-841
adapters/python/mini-swe-agent/src/nemo_fabric_adapters/mini_swe_agent/adapter.py (1)
134-136: LGTM!Also applies to: 193-193, 214-214
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Signed-off-by: mschwab <mschwab@nvidia.com>
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- Around line 469-506: Extend the adapter coverage around
test_session_root_in_request_context_roots_relay_propagation with parametrized
empty, non-UUID, and bare session_id context cases. Verify each falls back to
the request ID for both propagation roots and omits nemo_fabric_session_root
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Relay derives the OTel span id from the low eight bytes of a UUID and rejects a PropagationContext whose parent or root has them all zero, nil included. Such a relay_session_root reached Relay and failed the run instead of falling back to the request root. Apply Relay's rule in the shared guard and pin it against the real binding. Signed-off-by: mschwab <mschwab@nvidia.com>
The custom-agent example is the reference the adapter-authoring skill points at, and it still rooted propagation at the request alone. Forward the run request's relay_session_root to relay_request_context, matching the Deep Agents and mini-SWE-agent adapters. Signed-off-by: mschwab <mschwab@nvidia.com>
Callers had no way to discover the key, its UUID requirement, or the fallback rule. Describe it in the Python SDK guide, the common, Deep Agents, and mini-SWE-agent READMEs, and keep both integration skills and the adapter-authoring eval in parity. Signed-off-by: mschwab <mschwab@nvidia.com>
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Review comments at @adapters/python/common/README.md:
- Line 138: Update the request-parent documentation to state that
`relay_request_context()` keeps the request as parent only when its request ID
is a usable UUID; for a non-UUID ID with a valid session root, the session root
is both parent and root, while the request ID remains metadata. In
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examples/langgraph_custom_agent/adapter/runtime.py (1)
18-18: LGTM!Also applies to: 130-130
examples/langgraph_custom_agent/adapter/telemetry.py (1)
112-112: LGTM!Also applies to: 136-136
tests/examples/langgraph_custom_agent/test_adapter.py (1)
11-11: LGTM!Also applies to: 24-24, 165-222
tests/examples/langgraph_custom_agent/test_telemetry.py (1)
106-107: LGTM!Also applies to: 161-161, 167-167
The shared UUID guard now also rejects identifiers Relay cannot use, so a request id with all-zero final eight bytes takes the non-UUID path instead of raising inside Relay. Signed-off-by: mschwab <mschwab@nvidia.com>
Fabric drops an unusable session root without an error so telemetry never fails an invocation. Say so, and say the value must be a UUID string, so a caller knows grouping can quietly not happen. Signed-off-by: mschwab <mschwab@nvidia.com>
Reuse _stub_relay in test_relay_request_context instead of repeating its body, require session_root on the two private telemetry entry points that each have one production caller, and fold the context-key rationale into the session_root_id docstring. Signed-off-by: mschwab <mschwab@nvidia.com>
Signed-off-by: mschwab <mschwab@nvidia.com>
With a non-UUID request ID, which is the SDK default, the session root is both parent and root. The docs, skill, and eval said the request always stayed the parent. Signed-off-by: mschwab <mschwab@nvidia.com>
Drop the Relay 0.9 sentence, which every Relay-enabled package already pins. Keep the identifier rules in the maintainer-facing common README and say only 'unusable value' in user docs. Reflow the skill paragraphs and name the helpers the same way in the skill and its eval. Signed-off-by: mschwab <mschwab@nvidia.com>
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||
| def relay_request_context(request_id: str) -> tuple[Any, dict[str, str]]: | ||
| """Use a UUID request ID as Relay's propagated root and preserve metadata.""" | ||
| SESSION_ROOT_CONTEXT_KEY = "relay_session_root" |
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Overview
Lets a caller root Relay propagation at its own session so that several Fabric requests, one chat turn each, land in Intake as one session with one trajectory per turn.
Relay derives ATIF
session_idfrom the propagation root. A root minted per request, which is what #260 does by default, makes every invocation its own session. An adapter now readsrelay_session_rootfrom the run request context and uses it as the propagation root; a UUID request ID stays the parent, otherwise the session root is also the parent. Without it the behaviour is unchanged.Behaviour changes for existing callers
RunRequest.request_iddefaults torequest-<uuid4 hex>(sdk/python/nemo-fabric-runtime/src/nemo_fabric/models.py), which is not a UUID, so onmainrelay_request_contextreturnsnullcontext()and seeds no propagation for those callers at all. With a validrelay_session_rootthe session becomes the root and, because the request id is not a UUID, also the parent. Callers that send neither are unchanged.mainpassed any parseable UUID toPropagationContext, which raisesValueErrorfor the nil UUID or a UUID whose final eight bytes are zero; adapters reported that as a telemetry error. The shared guard now applies Relay's rule, so such a request id takes the non-UUID path and seeds nothing. Pinned intest_relay_request_context.relay_session_rootfalls back to the per-request root without an error. The docs say the value must be a UUID string and that grouping can quietly not happen.Breaking changes
None. The context key is new and optional. A missing, empty, non-UUID, or Relay-unusable value (nil UUID, or any UUID whose low eight bytes are zero, which Relay refuses because it derives the OTel span id from them) falls back to the per-request root from #260 and is left out of the scope metadata.
Details
nemo_fabric_adapters.common.utils:SESSION_ROOT_CONTEXT_KEY = "relay_session_root",session_root_id(context), andrelay_request_context(request_id, session_root=None). Validation sits in that one function because it is the only place that constructsPropagationContext, so a malformed root never reaches Relay. When a root is used it is also recorded asnemo_fabric_session_rootin the scope metadata.session_root_id(request.context)through.session_id. Adapters already surface harness session ids, and a caller sending one for unrelated reasons would have had its traces silently regrouped. A test pins that a baresession_idroots nothing.langgraph_custom_agentexample, which the adapter-authoring skill points at as the reference pattern, forwards the key too.docs/sdk/python.mdxand the common, Deep Agents, and mini-SWE-agent READMEs;skills/nemo-fabric-integrate,skills/nemo-fabric-build-adapter, and its relay-correlation eval are updated in parity.nooaadapter does not read the key and keeps per-request roots.Requires Relay 0.9, the first release where ATIF session identity comes from the propagation root (NVIDIA/NeMo-Relay#959). Main is already there via #313.
Validation
uv run pytest tests --ignore=tests/e2e --ignore=tests/scripts: 1469 passed, 60 skipped against the main lock (Relay 0.9.3).test_adapaters_common_utils.pycovers UUID root, non-UUID root, empty root, nil and zero-span-id roots against the real Relay binding, andsession_idnot rooting;test_deepagents.pyandtest_mini_swe_agent.pydrive the adapter paths end to end for a UUID root, a non-UUID request id, and the fallback cases, asserting thePropagationContextRelay receives.tests/examples/langgraph_custom_agent/test_adapter.pypins that the example'sinvokeforwards a valid session root and drops an unusable or missing one.ruff format --checkreports two touched test files, but the same files fail onmainunchanged; this branch adds no new drift.Where should the reviewer start?
adapters/python/common/src/nemo_fabric_adapters/common/utils.py,relay_request_context. Everything else threads its two arguments.Related Issues: (use one of the action keywords Closes / Fixes / Resolves / Relates to)
Relates to #260, #263, #313.
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