feat(llmobs): add annotateAgentManifest manual API to LLMObs SDK by yahya-mouman · Pull Request #12318 · DataDog/dd-trace-java

yahya-mouman · 2026-08-27T14:01:13Z

Summary

Adds annotateAgentManifest(LLMObs.AgentManifest) to the Java LLMObs SDK, allowing users to manually declare an agent span's configuration (name, instructions, model, model_settings, tools). Mirrors the Python implementation (DataDog/dd-trace-py#19771) and follows the annotatePrompt pattern from #12161.

Changes

LLMObsTags.java — adds AGENT_MANIFEST = "agent_manifest" constant
LLMObs.java — adds two public immutable builder classes:
- LLMObs.AgentTool — represents a single tool (name, optional description, optional parameters)
- LLMObs.AgentManifest — builder with name, instructions, model, model_settings, tools
LLMObsSpan.java — adds default void annotateAgentManifest(LLMObs.AgentManifest) (no-op default for backwards compat)
NoOpLLMObsSpan.java — explicit @Override no-op
DDLLMObsSpan.java — real implementation: validates span kind (agent only), builds manifest map, stores as _ml_obs_tag.agent_manifest
LLMObsSpanMapper.java — adds agent_manifest to TAGS_FOR_REMAPPING; serializes to meta.agent_manifest as a msgpack map

Behaviour

LLMObs.AgentManifest manifest = LLMObs.AgentManifest.builder()
    .name("travel_desk")
    .instructions("Book travel for the user.")
    .model("gpt-4o")
    .modelSettings(Map.of("temperature", 0.7))
    .tools(List.of(LLMObs.AgentTool.from("get_weather", "Look up weather", null)))
    .build();

agentSpan.annotateAgentManifest(manifest);

Only applies to agent span kind; other span kinds emit a log warning and no-op
Calling twice on the same span overwrites the previous manifest (no merge)
framework is set to "AgentObs SDK" automatically by the SDK
name defaults to the span name if not provided
model_settings keys are forwarded as-is (no allowlist in this initial PR)
Null manifest is silently ignored

Test plan

./gradlew :dd-trace-api:test --tests "datadog.trace.api.llmobs.LLMObsTest" — 27 tests pass (4 new)
./gradlew :dd-java-agent:agent-llmobs:test --tests "datadog.trace.llmobs.domain.DDLLMObsSpanTest" — 39 tests pass (7 new)
./gradlew :dd-trace-core:test --tests "datadog.trace.llmobs.writer.ddintake.LLMObsSpanMapperTest" — 18 tests pass (2 new)

🤖 Generated with Claude Code

- Add AgentManifest immutable value class with Builder pattern in LLMObs.java - Add AgentTool immutable value class in LLMObs.java - Add AGENT_MANIFEST constant to LLMObsTags - Add annotateAgentManifest() default method to LLMObsSpan interface - Add comprehensive builder tests for AgentManifest and AgentTool Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Stores agent manifest fields (name, instructions, model, model_settings, tools) as an internal tag `_ml_obs_tag.agent_manifest`. Only applies to agent spans; warns and no-ops on other span kinds. Null manifest is silently ignored. Tools with null/empty names are skipped with a warning. A second call overwrites the previous manifest. Framework field "AgentObs SDK" is always added when any manifest fields are present. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Add AGENT_MANIFEST_KEY byte constant, include the tag in TAGS_FOR_REMAPPING, and handle it in the meta serialization loop as a msgpack map. Add two tests: one verifying all manifest fields appear in meta, one verifying the tag does not leak into the tags list. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

ncybul · 2026-08-27T16:51:14Z

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ncybul

A couple minor suggestions but overall looks good to me! Would be nice to see a manual verification of setting the manifest via the SDK.

dd-octo-sts · 2026-08-28T11:08:53Z

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datadog-prod-us1-6

More details

The default API method keeps compatibility. The implementation accepts manifests only for agent spans and writes them to meta.agent_manifest.

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_{🤖 Datadog Autotest · Commit b5f56f1 · What is Autotest? · @DataDog review to ask questions · Any feedback? Reach out in #autotest}

…test hardening - Change annotateAgentManifest to merge successive calls instead of overwriting: name/instructions/model use new-value-wins logic with fallbacks; model_settings shallow-merges; tools replace only when caller provides a non-empty list. - Change MANUAL_FRAMEWORK constant from "AgentObs SDK" to "manual". - Update all test assertions that expected "AgentObs SDK" to "manual". - Replace overwrite test with merge-semantics test; add model_settings merge test. - Tests for post-finish no-op and empty-tools-list were already present. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

sabrenner

one main comment a couple nits otherwise lgtm!

…domain/DDLLMObsSpan.java Co-authored-by: Sam Brenner <106700075+sabrenner@users.noreply.github.com>

…nce; update docstring Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

dd-octo-sts · 2026-08-31T10:59:47Z

/merge

gh-worker-devflow-routing-ef8351 · 2026-08-31T10:59:51Z

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yahya-mouman · 2026-08-31T13:21:43Z

/merge

gh-worker-devflow-routing-ef8351 · 2026-08-31T13:21:47Z

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dd-octo-sts · 2026-08-31T14:01:15Z

/merge

gh-worker-devflow-routing-ef8351 · 2026-08-31T14:01:19Z

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yahya-mouman and others added 4 commits August 27, 2026 13:36

feat(llmobs): add annotateAgentManifest default method to LLMObsSpan

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yahya-mouman added the type: feature Enhancements and improvements label Aug 27, 2026

yahya-mouman requested review from ncybul and sabrenner August 27, 2026 14:15

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Comment thread dd-java-agent/agent-llmobs/src/main/java/datadog/trace/llmobs/domain/DDLLMObsSpan.java Outdated

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yahya-mouman marked this pull request as ready for review August 28, 2026 11:08

yahya-mouman requested a review from a team as a code owner August 28, 2026 11:08

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yahya-mouman mentioned this pull request Aug 28, 2026

feat(llmobs): accept an agent manifest manually DataDog/dd-trace-py#19771

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sabrenner reviewed Aug 28, 2026

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Comment thread dd-java-agent/agent-llmobs/src/main/java/datadog/trace/llmobs/domain/DDLLMObsSpan.java Outdated

yahya-mouman and others added 2 commits August 28, 2026 19:43

Update dd-java-agent/agent-llmobs/src/main/java/datadog/trace/llmobs/…

a0e864c

…domain/DDLLMObsSpan.java Co-authored-by: Sam Brenner <106700075+sabrenner@users.noreply.github.com>

Extract manifest getter calls to local variables; fix spanName refere…

df4a559

…nce; update docstring Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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yahya-mouman added the comp: mlobs ML Observability (LLMObs) label Aug 31, 2026

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gh-worker-dd-mergequeue-cf854d Bot merged commit e149937 into master Aug 31, 2026
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yahya-mouman commented Aug 27, 2026

Summary

Changes

Behaviour

Test plan

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