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feat(@modelcontextprotocol/sdk): add server-side LLMObs plugins#8921

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apm-integration-toolkit/modelcontextprotocol-sdk/server-llmobs
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feat(@modelcontextprotocol/sdk): add server-side LLMObs plugins#8921
wconti27 wants to merge 3 commits into
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apm-integration-toolkit/modelcontextprotocol-sdk/server-llmobs

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@wconti27

@wconti27 wconti27 commented Jun 15, 2026

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What does this PR do?

Adds server-side LLMObs support for @modelcontextprotocol/sdk on top of the base MCP tracing work from #8916, and aligns the MCP LLMObs shape with the Python tracer where the SDKs overlap.

  • Adds McpServerRequestLLMObsPlugin for MCP server request LLMObs spans.
  • Adds client initialize LLMObs spans (MCP Client Initialize) and server initialize LLMObs spans (mcp.initialize).
  • Emits tools/call server requests as LLMObs tool spans on the base APM mcp.request / server_tool_call span.
  • Tags server tool LLMObs spans with mcp_method, mcp_tool, and mcp_tool_kind:server.
  • Tags server request spans with mcp_session_id when the MCP transport exposes one.
  • Tags server initialize spans with mcp_method, client_name, and Python-style client_version.
  • Keeps client tool-call LLMObs input arguments-only and keeps client tags conservative (mcp_tool_kind, mcp_server_name).
  • Records client tool error results as output plus error metadata, matching Python.
  • Records full server request input/output for server request spans, while keeping client tool output normalized to MCP text content.
  • Aligns client list-tools naming/input with Python (MCP Client list Tools, cursor input).
  • Sanitizes internal MCP distributed trace metadata from server request LLMObs input.
  • Preserves LLMObs parent context across concurrent server requests.

Motivation

MCP servers are a key AI infrastructure boundary. This captures server request/tool activity in LLMObs while keeping internal trace propagation metadata out of LLMObs input payloads and avoiding duplicate LLMObs events for the JS-only internal mcp.server.tool.call APM span.

Additional Notes

  • Base tracing PR feat(@modelcontextprotocol/sdk): add tracing for MCP server requests and client operations #8916 has landed; this PR now targets master.
  • Current branch head: 96d69a31f.
  • Server request span completion reuses the base tracing lifecycle hooks around SDK request handler dispatch and cleanup. The SDK does not expose a public post-response server request hook, so the instrumentation pins the normal response, validation error, custom handler rejection, unknown method, and close cleanup paths in tests.

Local verification:

  • env -u OTEL_TRACES_EXPORTER -u OTEL_LOGS_EXPORTER -u OTEL_METRICS_EXPORTER PATH=/Users/william.conti/.nvm/versions/node/v22.17.0/bin:$PATH ./node_modules/.bin/nyc --reporter=text --include 'packages/dd-trace/src/llmobs/plugins/modelcontextprotocol-sdk/**/*.js' /Users/william.conti/.nvm/versions/node/v22.17.0/bin/node ./node_modules/mocha/bin/mocha.js --timeout 60000 packages/dd-trace/test/llmobs/plugins/modelcontextprotocol-sdk/index.spec.js packages/dd-trace/test/llmobs/plugins/modelcontextprotocol-sdk/utils.spec.js - passed, 45 passing; lines/functions 100%, statements 96.52%, branches 86.84%.
  • env -u OTEL_TRACES_EXPORTER -u OTEL_LOGS_EXPORTER -u OTEL_METRICS_EXPORTER /Users/william.conti/.nvm/versions/node/v22.17.0/bin/node ./node_modules/mocha/bin/mocha.js --reporter dot --timeout 60000 packages/datadog-plugin-modelcontextprotocol-sdk/test/index.spec.js - passed, 51 passing.
  • /Users/william.conti/.nvm/versions/node/v22.17.0/bin/node ./node_modules/eslint/bin/eslint.js packages/datadog-instrumentations/src/modelcontextprotocol-sdk.js packages/datadog-plugin-modelcontextprotocol-sdk/test/index.spec.js packages/datadog-plugin-modelcontextprotocol-sdk/test/test-setup.js packages/dd-trace/src/llmobs/plugins/modelcontextprotocol-sdk/index.js packages/dd-trace/src/llmobs/plugins/modelcontextprotocol-sdk/utils.js packages/dd-trace/test/llmobs/plugins/modelcontextprotocol-sdk/index.spec.js packages/dd-trace/test/llmobs/plugins/modelcontextprotocol-sdk/utils.spec.js packages/dd-trace/test/llmobs/util.js --max-warnings 0 - passed.
  • git diff --check - passed.

@wconti27
wconti27 requested a review from a team as a code owner June 15, 2026 21:28
@wconti27
wconti27 requested a review from a team as a code owner June 15, 2026 21:28
@wconti27
wconti27 requested review from crysmags and removed request for a team June 15, 2026 21:28
@codecov

codecov Bot commented Jun 15, 2026

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Codecov Report

❌ Patch coverage is 41.39073% with 177 lines in your changes missing coverage. Please review.
✅ Project coverage is 96.50%. Comparing base (9c965cc) to head (96d69a3).
⚠️ Report is 11 commits behind head on master.

Files with missing lines Patch % Lines
...c/llmobs/plugins/modelcontextprotocol-sdk/utils.js 25.19% 95 Missing ⚠️
...c/llmobs/plugins/modelcontextprotocol-sdk/index.js 31.31% 68 Missing ⚠️
...g-instrumentations/src/modelcontextprotocol-sdk.js 77.04% 14 Missing ⚠️
Additional details and impacted files
@@            Coverage Diff             @@
##           master    #8921      +/-   ##
==========================================
- Coverage   96.61%   96.50%   -0.11%     
==========================================
  Files         920      923       +3     
  Lines      122266   122831     +565     
  Branches    21008    21259     +251     
==========================================
+ Hits       118128   118544     +416     
- Misses       4138     4287     +149     
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@dd-octo-sts

dd-octo-sts Bot commented Jun 15, 2026

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Overall package size

Self size: 6.76 MB
Deduped: 7.42 MB
No deduping: 7.42 MB

Dependency sizes | name | version | self size | total size | |------|---------|-----------|------------| | import-in-the-middle | 3.3.1 | 122.62 kB | 438.86 kB | | opentracing | 0.14.7 | 194.81 kB | 194.81 kB | | dc-polyfill | 0.1.11 | 25.74 kB | 25.74 kB |

🤖 This report was automatically generated by heaviest-objects-in-the-universe

@wconti27 wconti27 added the apm-integration-toolkit PR Generated by APM AI Integration Toolkit label Jun 15, 2026
@datadog-prod-us1-6

datadog-prod-us1-6 Bot commented Jun 15, 2026

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Tests

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

🔄 Datadog auto-retried 1 job - 1 passed on retry View in Datadog

🎯 Code Coverage (details)
Patch Coverage: 41.53%
Overall Coverage: 96.47% (-0.10%)

This comment will be updated automatically if new data arrives.
🔗 Commit SHA: 96d69a3 | Docs | Datadog PR Page | Give us feedback!

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💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 452656b815

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Comment thread packages/dd-trace/src/llmobs/plugins/modelcontextprotocol-sdk/index.js Outdated
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pr-commenter Bot commented Jun 29, 2026

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Benchmarks

Benchmark execution time: 2026-07-14 19:46:38

Comparing candidate commit 96d69a3 in PR branch apm-integration-toolkit/modelcontextprotocol-sdk/server-llmobs with baseline commit 9c965cc in branch master.

📊 Benchmarking dashboard

Found 0 performance improvements and 0 performance regressions! Performance is the same for 2309 metrics, 49 unstable metrics.

Explanation

This is an A/B test comparing a candidate commit's performance against that of a baseline commit. Performance changes are noted in the tables below as:

  • 🟩 = significantly better candidate vs. baseline
  • 🟥 = significantly worse candidate vs. baseline

We compute a confidence interval (CI) over the relative difference of means between metrics from the candidate and baseline commits, considering the baseline as the reference.

If the CI is entirely outside the configured SIGNIFICANT_IMPACT_THRESHOLD (or the deprecated UNCONFIDENCE_THRESHOLD), the change is considered significant.

Feel free to reach out to #apm-benchmarking-platform on Slack if you have any questions.

More details about the CI and significant changes

You can imagine this CI as a range of values that is likely to contain the true difference of means between the candidate and baseline commits.

CIs of the difference of means are often centered around 0%, because often changes are not that big:

---------------------------------(------|---^--------)-------------------------------->
                              -0.6%    0%  0.3%     +1.2%
                                 |          |        |
         lower bound of the CI --'          |        |
sample mean (center of the CI) -------------'        |
         upper bound of the CI ----------------------'

As described above, a change is considered significant if the CI is entirely outside the configured SIGNIFICANT_IMPACT_THRESHOLD (or the deprecated UNCONFIDENCE_THRESHOLD).

For instance, for an execution time metric, this confidence interval indicates a significantly worse performance:

----------------------------------------|---------|---(---------^---------)---------->
                                       0%        1%  1.3%      2.2%      3.1%
                                                  |   |         |         |
       significant impact threshold --------------'   |         |         |
                      lower bound of CI --------------'         |         |
       sample mean (center of the CI) --------------------------'         |
                      upper bound of CI ----------------------------------'

Unstable benchmarks

These benchmarks have a confidence interval too wide to call a change; treat them as noise rather than signal.

scenario:appsec-appsec-enabled-24

  • unstable execution_time [-209.280ms; +216.969ms] or [-7.893%; +8.182%]

scenario:appsec-appsec-enabled-26

  • unstable execution_time [-248.291ms; +239.398ms] or [-9.718%; +9.369%]

scenario:appsec-appsec-enabled-with-attacks-24

  • unstable execution_time [-159.020ms; +162.499ms] or [-5.156%; +5.269%]

scenario:appsec-appsec-enabled-with-attacks-26

  • unstable execution_time [-196.901ms; +192.270ms] or [-6.781%; +6.621%]

scenario:appsec-control-20

  • unstable execution_time [-120.346ms; +116.778ms] or [-7.308%; +7.091%]

scenario:appsec-control-24

  • unstable execution_time [-112.386ms; +115.897ms] or [-9.083%; +9.366%]

scenario:appsec-control-26

  • unstable execution_time [-125986.885µs; +125415.218µs] or [-10.188%; +10.142%]

scenario:appsec-iast-no-vulnerability-control-20

  • unstable execution_time [-16997.992µs; +15139.526µs] or [-6.635%; +5.909%]

scenario:appsec-iast-no-vulnerability-iast-enabled-always-active-20

  • unstable execution_time [-23.188ms; +10.395ms] or [-8.992%; +4.031%]

scenario:appsec-iast-no-vulnerability-iast-enabled-default-config-20

  • unstable execution_time [-14.816ms; +18.333ms] or [-5.753%; +7.118%]

scenario:child_process-file-args-24

  • unstable execution_time [-24168.089µs; +24369.489µs] or [-5.081%; +5.124%]

scenario:debugger-line-probe-with-snapshot-default-24

  • unstable cpu_user_time [-495.509ms; +329.044ms] or [-6.152%; +4.085%]
  • unstable instructions [-4030.1M instructions; +2893.1M instructions] or [-6.148%; +4.414%]

scenario:debugger-line-probe-with-snapshot-default-26

  • unstable cpu_user_time [-3683393.152µs; +3681867.152µs] or [-35.680%; +35.665%]
  • unstable execution_time [-3678.924ms; +3666.616ms] or [-33.313%; +33.201%]
  • unstable instructions [-32396.9M instructions; +32325.0M instructions] or [-37.480%; +37.397%]
  • unstable max_rss_usage [-12.645MB; +10.624MB] or [-7.779%; +6.536%]
  • unstable throughput [-713.907op/s; +726.131op/s] or [-23.217%; +23.614%]

scenario:debugger-line-probe-with-snapshot-minimal-24

  • unstable cpu_user_time [-2345.762ms; +3988.821ms] or [-27.180%; +46.218%]
  • unstable execution_time [-2359.129ms; +4009.198ms] or [-25.231%; +42.879%]
  • unstable instructions [-20.0G instructions; +33.7G instructions] or [-28.283%; +47.774%]
  • unstable max_rss_usage [-7.929MB; +13.678MB] or [-5.022%; +8.664%]
  • unstable throughput [-956.007op/s; +534.053op/s] or [-26.883%; +15.018%]

scenario:debugger-line-probe-with-snapshot-minimal-26

  • unstable cpu_user_time [-2618.634ms; +4147.618ms] or [-27.425%; +43.438%]
  • unstable execution_time [-2649.221ms; +4179.582ms] or [-25.819%; +40.733%]
  • unstable instructions [-23.2G instructions; +36.9G instructions] or [-29.188%; +46.303%]
  • unstable max_rss_usage [-7.132MB; +12.998MB] or [-4.432%; +8.076%]
  • unstable throughput [-819.546op/s; +523.594op/s] or [-25.364%; +16.205%]

scenario:debugger-line-probe-without-snapshot-24

  • unstable cpu_user_time [-3059.475ms; +3526.381ms] or [-33.665%; +38.803%]
  • unstable execution_time [-3075.083ms; +3541.796ms] or [-31.350%; +36.109%]
  • unstable instructions [-29.7G instructions; +38.1G instructions] or [-39.205%; +50.293%]
  • unstable max_rss_usage [-11232.656KB; +12155.056KB] or [-7.050%; +7.629%]
  • unstable throughput [-828.862op/s; +765.392op/s] or [-24.160%; +22.310%]

scenario:debugger-line-probe-without-snapshot-26

  • unstable cpu_user_time [-2258.224ms; +741.918ms] or [-23.715%; +7.791%]
  • unstable execution_time [-2267.201ms; +772.816ms] or [-22.113%; +7.538%]
  • unstable instructions [-20.2G instructions; +6.6G instructions] or [-25.426%; +8.326%]
  • unstable throughput [-161.210op/s; +449.791op/s] or [-4.989%; +13.918%]

scenario:dogstatsd-with-tags-20

  • unstable cpu_user_time [-371.252ms; +225.202ms] or [-7.999%; +4.852%]
  • unstable execution_time [-371.842ms; +226.990ms] or [-7.877%; +4.808%]
  • unstable throughput [-83088.741op/s; +130039.240op/s] or [-4.675%; +7.316%]

scenario:plugin-aws-sdk-lambda-inject-with-context-24

  • unstable cpu_user_time [-276.259ms; +146.452ms] or [-7.031%; +3.727%]
  • unstable execution_time [-273.170ms; +147.730ms] or [-6.910%; +3.737%]
  • unstable throughput [-18235.947op/s; +35025.497op/s] or [-3.582%; +6.879%]

scenario:plugin-claude-agent-sdk-compact-stream-scan-24

  • unstable cpu_usage_percentage [-7.904%; +2.192%]

scenario:plugin-claude-agent-sdk-compact-stream-scan-26

  • unstable cpu_usage_percentage [-5.560%; +4.541%]

scenario:plugin-graphql-long-with-depth-off-20

  • unstable max_rss_usage [-6840.669KB; +6468.669KB] or [-5.273%; +4.987%]

scenario:plugin-graphql-long-with-depth-on-max-20

  • unstable cpu_user_time [-709.097ms; +741.348ms] or [-5.525%; +5.776%]
  • unstable execution_time [-716.611ms; +732.516ms] or [-5.462%; +5.583%]
  • unstable throughput [-3.348op/s; +3.294op/s] or [-5.459%; +5.369%]

Base automatically changed from apm-integration-toolkit/modelcontextprotocol-sdk/server-tracing to master July 14, 2026 12:29
@wconti27
wconti27 force-pushed the apm-integration-toolkit/modelcontextprotocol-sdk/server-llmobs branch 3 times, most recently from 60d69ee to 934cced Compare July 14, 2026 16:59
@wconti27
wconti27 force-pushed the apm-integration-toolkit/modelcontextprotocol-sdk/server-llmobs branch from 934cced to 02d9102 Compare July 14, 2026 17:04
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