Witness MCP server
Production proofs for breaking JSON Schema/MCP changes; UNKNOWN/NO_WITNESS_FOUND not compatible.
C67/100grade C
Adoption
New
Little public usage data yet
Reviews
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If you have run it, two minutes of your experience saves the next person an afternoon.
Witness tools (1)
write = sends, deletes, buys or postscontract_witnessFreeProduce a concrete independently revalidated JSON-Schema/MCP backward-compatibility witness before merge/deploy. UNKNOWN or NO_WITNESS_FOUND never means compatible.
Public scan report
scanner v0.1.9 · 2026-09-20 · same rubric, same numbers if you re-run it
1 low
- –Code scanremote-only server, no package to scann/a
- Live reliabilityremote reachable in 687ms20/20
- Tool poisoning1 tool descriptions checked15/15
- Auth qualityopen endpoint, read-only tools10/15
- Maintenanceno repository listed3/15
- Maintainer identityno repository or website to verify2/10
Findings (1)
- lowNo source repository listed
maint.no-repo
Overall 67/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON
Install directly
claude mcp add --transport http witness https://witness-contractwitness-production.witness-test.workers.dev/mcp
Witness: common questions
- Is Witness MCP server safe?
- With care: it is graded C, so read the findings first (67/100). Read the Witness safety report
- How do I install Witness?
- It runs remotely at witness-contractwitness-production.witness-test.workers.dev. Add it to Claude Code, Claude Desktop or Cursor with the snippets above, or call it through the mcp.market gateway without installing anything.
- Does Witness need an API key?
- Not as far as the registry entry and our scan can tell: no credentials are declared or required.
- Is Witness maintained?
- The latest release is v0.3.0.
- Is Witness up?
- 100% of our last 8 checks got an answer. We check remote servers about four times a day.