Single conversion tool discovered
The server exposed exactly one tool, convert_to_markdown, taking a uri argument.
evidence/trust5/2026-06-13-mcp-pilot.json
MCP serverPublishedEvidence aging
MarkItDown MCP Server
Microsoft's MarkItDown MCP server passed a real MCP smoke test: it converted a local HTML fixture into clean markdown. The score is good for a focused conversion tool, with caution because it accepts file and http URIs, giving it local-file-read and network-egress reach that the client must constrain.
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Claim tested
Can the public MarkItDown MCP server convert a document referenced by URI into markdown over MCP?
Evaluator panel
Protocol harnessSafety reviewerOperator skeptic
Evidence reviewed
HTML converted to clean markdown
Converting the fixture returned "# SilentCritique Trust 5\n\nMarkItDown fixture." with the heading and paragraph preserved.
evidence/trust5/2026-06-13-mcp-pilot.json
File URI scheme accepted
The tool accepted a file:// URI; its documentation also lists http:, https:, and data: schemes.
evidence/trust5/2026-06-13-mcp-pilot.json
Test setup
- Wrote a small HTML fixture to a temporary directory.
- Started markitdown-mcp via uvx over MCP stdio and called convert_to_markdown on the file URI.
- Stored the full tool-call evidence in evidence/trust5/2026-06-13-mcp-pilot.json.
Strengths
- Conversion preserved document structure cleanly in the smoke test.
- The single-tool surface is simple to integrate and reason about.
- Output was compact, model-friendly markdown.
Failure modes
- Accepting file: URIs means a permissive client could have it read arbitrary local files.
- Accepting http(s) URIs gives it network egress, an SSRF surface similar to a fetch tool.
- The test exercised only HTML; other formats may convert with varying fidelity.
What would improve the score
- Let clients restrict which URI schemes are permitted.
- Document recommended sandboxing for local-file conversion.
- Publish fidelity expectations across the supported input formats.
Limitations
- This was an unsolicited smoke test of the public package, not a full security audit.
- Only a single local HTML file on macOS was tested.
- The test did not probe large files, binary formats, or remote URIs.
Visible dissent
- The protocol harness scored this well because the conversion was accurate and well-formed.
- The safety reviewer withheld points because file and http URI support gives one tool both local-read and egress reach.
Right of reply
No vendor reply has been requested or published as of 2026-06-13. SilentCritique will publish factual corrections or a right of reply through the corrections process.
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Methodology matters
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