feat(mcp): add anonymized MCP attribution to tool-call telemetry - #1131
feat(mcp): add anonymized MCP attribution to tool-call telemetry#1131Aaron ("AJ") Steers (aaronsteers) wants to merge 8 commits into
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Co-Authored-By: AJ Steers <aj@airbyte.io>
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Included review availability: Your plan provides up to 2 included reviews per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe MCP server now configures anonymized telemetry attribution. Local deployments use the persisted analytics ID, while hosted deployments omit the shared container ID. Tests cover the new configuration and identity behavior. ChangesMCP telemetry attribution
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🟡 Moderate · up to This change adds hashed caller, session, and authentication attribution to MCP telemetry, but the documented hosted salt configuration does not match the variable read by the server, so deployments may use the analytics identifier as the hashing key instead of a dedicated secret. That can weaken anonymization for caller-derived values; merge should wait for the configuration mismatch to be fixed or explicitly accepted by the owner. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Aaron ("AJ") Steers (aaronsteers)
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Pull request overview
Adds privacy-safe attribution dimensions to MCP tool-call telemetry so tool calls can be analyzed with meaningful denominators (sessions/callers/endpoints) without emitting raw identifiers. This builds on the existing fastmcp-extensions telemetry wiring by deriving scoped, keyed HMAC hashes and selectively emitting plaintext endpoint data only for Airbyte-owned domains.
Changes:
- Introduces
airbyte.mcp._telemetry_attribution.get_telemetry_attribution()to compute optional hashed attribution fields (session/caller/auth subject/endpoint/client info). - Wires the new attribution callable into
TelemetryConfig.extra_propertiesfor MCP tool-call events. - Expands unit test coverage for hash construction, salt precedence/fallback, X-Forwarded-For first-hop selection, and plaintext-vs-hashed endpoint handling.
Reviewed changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.
| File | Description |
|---|---|
airbyte/mcp/_telemetry_attribution.py |
New module implementing scoped, keyed HMAC hashing and safe extraction of request/session attribution properties. |
airbyte/mcp/server.py |
Switches MCP telemetry extra_properties from a simple hosted-flag lambda to the new attribution resolver. |
tests/unit_tests/test_mcp_telemetry.py |
Adds unit tests validating attribution hashing behavior and privacy guarantees. |
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Co-Authored-By: AJ Steers <aj@airbyte.io>
Co-Authored-By: AJ Steers <aj@airbyte.io>
Co-Authored-By: AJ Steers <aj@airbyte.io>
Co-Authored-By: AJ Steers <aj@airbyte.io>
Code Coverage OverviewLanguages: Python Python / code-coverage/pytest-fastThe overall line coverage in commit d434d90 in the Show a line coverage summary of the most impacted files.
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Updated |
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Collapse this into _util.telemetry.py. Not enough here to justify a different module.
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👍 On it. Collapsing telemetry_anonymization.py into _util/telemetry.py — agreed, 167 lines of helpers doesn't earn its own module, and they only ever serve telemetry anyway. The tests fold into the existing telemetry test module too.
Worth flagging for sequencing: most of this module is about to be deleted regardless. The generic half (HMAC helper, salt resolution, session/caller/endpoint extraction) is moving upstream in fastmcp-extensions#113, so once this PR is reduced onto that, what's left is the three Airbyte-specific bits — is_hosted_mcp, the owned-domain list, and the analytics ULID as the stdio identity. Those belong in telemetry.py either way, so the collapse is the right shape now and stays right after the reduction.
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Update this PR to presume the fastmcp extensions PR has already landed.
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👍 On it. Reducing onto fastmcp-extensions#113 rather than relocating the code — telemetry_anonymization.py and its tests get deleted outright, and server.py just configures the upstream middleware: plaintext_endpoint_domains=("airbyte.ai", "airbyte.com", "airbyte.io"), caller_ip_fallback=False, anonymization_salt_fallback= the analytics ULID, and the existing is_hosted_mcp in extra_properties. That supersedes the collapse and the server.py placement — nothing fastmcp-dependent ends up in _util either way.
🙋 One consequence to flag: this needs a fastmcp-extensions floor above the latest release, so dependency resolution in CI will fail here until #113 lands and is tagged. I'd rather leave it red and honest than pin a git ref — say the word if you'd prefer the temporary git dependency instead.
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☑️ Resolved in 999a336. _util/telemetry_anonymization.py is deleted rather than collapsed — the generic logic now lives in fastmcp-extensions#113, so there was nothing left worth merging into telemetry.py. Net −648/+257 here.
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☑️ Resolved in 999a336. server.py now only configures the upstream middleware: known_public_mcp_domains=("airbyte.ai", "airbyte.com", "airbyte.io"), anonymization_salt=_mcp_anonymization_salt (env var, then the persisted analytics ID), caller_ip_fallback=False, and is_hosted_mcp via extra_properties. The dependency floor is fastmcp-extensions>=0.23.0, so CI here stays red on dependency resolution until #113 is released — expected, not a defect to chase.
| from fastmcp.server.dependencies import ( | ||
| get_access_token, | ||
| get_context, | ||
| get_http_request, | ||
| ) |
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Remove these dependencies, moving into an mcp module or (better) into the fastmcp extensions package.
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👍 On it. Right, and it changes the shape of the collapse you asked for one comment up — _util has to stay importable without the MCP extra, so the fastmcp-dependent code can't land in telemetry.py.
Splitting it rather than collapsing wholesale: the fastmcp-free half (HMAC helper, salt resolution, analytics-ID fallback, the owned-domain rule) folds into _util/telemetry.py; everything touching get_access_token/get_context/get_http_request moves into the MCP package, per your server.py comment. telemetry_anonymization.py goes away either way.
Your "better" option is already in flight — fastmcp-extensions#113 is exactly this extraction, made generic. It needs a release before PyAirbyte can pin it, so the MCP-side placement is the interim and then most of it deletes.
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This is the probably the right home for anything that can't live generically in the telemetry.py module (without importing fastmcp) and which can't live in fastmcp-extensions.
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👍 On it. Putting it in server.py directly rather than a new private module — it's the only consumer, and a separate module would be a third home for code that's headed upstream to fastmcp-extensions#113 anyway. If it turns out to bloat server.py badly I'll use a private module in the same package and say so here.
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☑️ Resolved in 999a336. No fastmcp import anywhere under _util/ — verified by importing airbyte._util.telemetry with fastmcp blocked from sys.modules, transitively as well as directly.
Co-Authored-By: AJ Steers <aj@airbyte.io>
Co-Authored-By: AJ Steers <aj@airbyte.io>
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Actionable comments posted: 1
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Inline comments:
In `@airbyte/mcp/server.py`:
- Line 312: Align ANONYMIZATION_SALT_ENV with the documented
AIRBYTE_MCP_TELEMETRY_SALT variable so deployments using the stated contract
load the configured attribution salt; alternatively update the contract wherever
it is defined to consistently use AIRBYTE_TELEMETRY_ANONYMIZATION_SALT.
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| SEGMENT_WRITE_KEY_ENV = "AIRBYTE_MCP_SEGMENT_WRITE_KEY" | ||
| ANONYMIZATION_SALT_ENV = "AIRBYTE_TELEMETRY_ANONYMIZATION_SALT" |
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🗄️ Data Integrity & Integration | 🟡 Minor | ⚡ Quick win
Align the salt environment-variable contract.
Could we read AIRBYTE_MCP_TELEMETRY_SALT, or update the stated contract to the variable used here? The PR objective names AIRBYTE_MCP_TELEMETRY_SALT, but this code reads AIRBYTE_TELEMETRY_ANONYMIZATION_SALT. A deployment that configures the documented variable silently falls back to the persisted analytics ID and does not use its selected attribution salt. wdyt?
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In `@airbyte/mcp/server.py` at line 312, Align ANONYMIZATION_SALT_ENV with the
documented AIRBYTE_MCP_TELEMETRY_SALT variable so deployments using the stated
contract load the configured attribution salt; alternatively update the contract
wherever it is defined to consistently use AIRBYTE_TELEMETRY_ANONYMIZATION_SALT.
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☑️ Real mismatch, but the description is what's stale — fixing that, not the code. The env var name is a deployment contract with the Ops repo: AIRBYTE_TELEMETRY_ANONYMIZATION_SALT is what's actually provisioned into every MCP service in airbyte-ops-mcp#1310, deliberately named without an MCP_ stem so the same secret is reusable across implementations. AIRBYTE_MCP_TELEMETRY_SALT was the earlier MCP-specific name and only survives in this PR's description; renaming the code to match it would break the wiring on the other side. Updating the description in the next push.
Co-Authored-By: AJ Steers <aj@airbyte.io>
Summary
Follow-up to #1124, requested by AJ. The
mcp_tool_callevent currently carries onlyname/success/duration_ms/error_type/package_version/is_hosted_mcp, anduserIdis the constant labelairbyte-mcp. That supports counting tool calls but gives no denominator: no sessions, no distinct callers, no way to tell prod from preview. This adds attribution dimensions without emitting any raw identifier.New properties on each event, all optional and independently guarded:
session_id_hashContext.session_idcaller_hashX-Forwarded-Forrequest.client.hostis the load balancer, not the callerauth_subject_hashget_access_token().claims["sub"]mcp_endpointmcp_endpoint_hashmcp_client_name/mcp_client_versioninitializehandshakeThe hash construction is the part worth reviewing:
It is keyed, not a bare digest, and that is not incidental. IPv4 is only 2^32 addresses, so
sha256(ip)— or a hash seeded solely with public inputs like the endpoint — is invertible by exhaustive enumeration in minutes, and 64-bit truncation does not prevent that (one candidate in 4.3 billion matches, so a hit is a confirmation). The secret key is the only thing making the value one-way. Thescope_labeland endpoint are in the message for separation rather than secrecy: they stop the same caller from correlating across prod and preview, and stop the IP surrogate from colliding with the session surrogate.Salt resolution is
AIRBYTE_MCP_TELEMETRY_SALT, falling back to PyAirbyte's existing persisted anonymous analytics ID. Hosted deployments must set the env var explicitly — the fallback is regenerated per container, which would silently degrade the surrogate from per-caller to per-instance. When the user has opted out of analytics there is no salt and no attribution is emitted.extra_propertiesis resolved at emit time insideon_call_tool, so this runs inside the live request scope and needs nofastmcp-extensionschange.Test plan
uv run ruff format --check .anduv run ruff check .— clean.uv run pytest tests/unit_tests/test_mcp_telemetry.py tests/unit_tests/test_mcp_http_main.py— 32 passed.caller_hashvalues, first-hop selection from a multi-entryX-Forwarded-For, Airbyte-owned vs third-party endpoint handling, and — explicitly — that the raw IP, raw session ID, raw subject and third-party hostname appear nowhere in the emitted payload.Not yet exercised against a live hosted deployment: that needs the PyAirbyte release, a Cloud MCP pin bump, and the salt provisioned in the deploy environment. Warehouse #3472 will absorb these columns rather than landing without them.
Relates to #1129.
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Requested by: Aaron ("AJ") Steers (@aaronsteers)
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