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Reported issues for mcp-probe

Pod holds 9 of 9 problems reported by people outside the maintainer team. Issues filed by the project's own owners, members and collaborators are excluded entirely — a maintainer's release checklist is not a warning to a prospective user.

Back to mcp-probe.

Most discussed

[v1.1] Description-vs-runtime drift detection (heuristic pass)

Context

Motivated by community feedback (Thomas Landgraf, dev.to, on "Schema descriptions are load-bearing"): descriptions can be technically wrong, not just missing — and that failure mode is harder to catch. Example: a parameter described as "ISO 8601 date string" that silently accepts Unix epoch milliseconds at runtime due to server-side coercion. The description is fluent, the JSON Schema is valid, the call succeeds — and the LLM eventually starts passing epochs because that's what a

Read the thread · 2026-05-07 · open · 0 comments

Benchmark mode with latency stats

Add `mcp-doctor bench` to measure performance, not just correctness.

Metrics

p50/p95/p99 latency per tool
Concurrent tool calling (parallel requests)
Memory usage of server process (if stdio)
Throughput — tools per second
`--iterations N` flag to run multiple times
Compare against baseline (`--baseline results.json`)

Read the thread · 2026-04-04 · closed · 0 comments

MCP spec compliance checker

Go beyond basic health checks — verify the server follows the MCP specification correctly.

Checks

Server returns correct protocol version
Capabilities match what's actually available
Pagination works correctly (cursor handling)
Error responses follow JSON-RPC 2.0 spec
Content types match declared MIME types
Tool annotations are consistent with behavior (e.g. readOnlyHint tools don't mutate)

Read the thread · 2026-04-04 · closed · 0 comments

HTML report output

Generate a shareable HTML report that looks professional.

Tasks

`--html report.html` flag
Clean, dark-themed single-file HTML with inline CSS
Collapsible sections for tools/resources/prompts
Show full tool response content in expandable details
Score card at top with color-coded pass/fail
Shareable — no external dependencies

Read the thread · 2026-04-04 · closed · 0 comments

Watch mode for development

Add a `mcp-doctor watch` command that re-runs inspection whenever the server restarts or files change.

Useful during MCP server development — like `vitest --watch` but for your MCP server.

Tasks

Add `watch` command
Re-run on file change (configurable glob)
Clear terminal between runs
Show diff from last run (what changed)

Read the thread · 2026-04-04 · closed · 0 comments

Publish to npm

Make `npx mcp-doctor` work globally by publishing to npm.

Tasks

Set up npm account/token
Add `prepublishOnly` script to run build + test
Add `files` field to package.json (only ship dist/)
Publish v0.1.0
Add install instructions to README

Read the thread · 2026-04-04 · closed · 0 comments

GitHub Actions CI workflow

Add a CI pipeline so contributors get instant feedback.

Tasks

Run `npm test` on push and PR
Run `tsc --noEmit` type checking
Test against `@modelcontextprotocol/server-everything` as integration test
Add status badge to README

Read the thread · 2026-04-04 · closed · 0 comments

Smarter sample argument generation

The current sample arg generator is basic — it only fills required fields with type-appropriate defaults.

Improvements

Parse JSON Schema `pattern` to generate matching strings
Support `oneOf` / `anyOf` schemas (pick first valid option)
Support nested object schemas
Support array items with `minItems`
Allow user-provided arg overrides via `--args tool_name='{"key": "value"}'`
Load sample args from a `.mcp-doctor.json` config file

Read the thread · 2026-04-04 · closed · 0 comments

Most recent

Support SSE and Streamable HTTP transports

Currently mcp-doctor only supports stdio transport (spawning a local process). Many MCP servers run over:

SSE (Server-Sent Events) — mcp-doctor test --sse http://localhost:3000/sse
Streamable HTTP — mcp-doctor test --http http://localhost:3000/mcp

Tasks

Add --sse <url> flag
Add --http <url> flag
Auto-detect transport from URL vs command string
Test against a real SSE server

Read the thread · 2026-04-04 · closed · 0 comments

The remaining reports are on the project's issue tracker.