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observer-mcp: a read-only MCP server - #57
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Eleven read-only tools over the HTTP API (overview, traces, failed traces with reasons, one trace with spans/tools/provider chain/scores, alerts, datasets, runs, comparison, metrics query). Trace and span input/output are never returned unless OBSERVER_MCP_CONTENT=1. A test fails if the reader can use anything but GET or the metrics query. Optional extra 'mcp'. Roadmap step 6 done.
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Step 6 of docs/roadmap.md.
observer-mcp(app/ops/mcp_server.py): MCP over stdio, talks to a running Observer via its HTTP API. Optional extramcp(also indevso CI tests it).readOnlyHint:observer_overview,list_traces,list_failed_traces(status error + health below a threshold, with reasons),get_trace(spans, tools, provider chain, scores),list_alerts,list_datasets,get_dataset,list_runs,compare_runs,metrics_schema,query_metrics.input/outputare never returned unlessOBSERVER_MCP_CONTENT=1; lists are capped.GETplus the metrics query (aPOSTthat computes, writes nothing); a test fails on any other method or write path. stdio only, no listening port.docs/mcp.md(setup for Claude Code, tools, privacy), README, roadmap.Tests (7): tool list and annotations, content omitted, failed traces, datasets/runs/comparison/metrics through an in-memory MCP client, clean errors, read-only guard. Backend 201 passed on this branch (it does not include the OTLP PR #56), ruff clean. Verified over real stdio with an MCP client against a synthetic Observer: an OTLP-ingested trace with its tool span was listed and read.
Closes roadmap steps 1–6; 'Later' (per-project capture modes, ingestion reliability) remains.
Merge order: this branch is based on
mainwithout #56; both append todocs/roadmap.md, so merge #56 first and I will rebase this one (the roadmap log lines would conflict otherwise).