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Results / @modelcontextprotocol/server-sequential-thinking
@modelcontextprotocol/server-sequential-thinking
A
Protocol4/4 points
Coverage: hygiene only (0 of 1 tools reached with a valid call). Only protocol hygiene was graded, so the A says little about what the tools do.
Protocol checks
| Check | Verdict | What happened |
|---|---|---|
| protocol Valid MCP handshake and tool schemas | pass | handshake ok, 1 well-formed tool(s) |
| tool-poisoningcritical No tool-poisoning indicators in tool metadata | pass | scanned 1 tool definition(s), including parameter text: nothing suspicious |
| robust-input Survives malformed tool input | pass | 4 invalid call(s) rejected cleanly |
| secret-echocritical No environment secret echoed in responses | pass | canary secrets absent from tools/list and 4 captured response(s) |
What was not covered
- Database: Not applicable. Server config has no {dsn}/{host}/... Placeholder, so the harness cannot start the server once per role
- HTTP: Not applicable. The server is started over stdio; the http pack needs server.url
- Files: Not applicable. No tool is classified as taking a file path with medium confidence or higher
- Git: Not applicable. No tool is classified as taking a git repository path with medium confidence or higher
- Network: Not applicable. No tool is classified as taking a URL with medium confidence or higher
- SQLite: Not applicable. No tool takes a SQL string
- Effects: Not applicable. No tool takes a harness-owned target (file path, repository or URL) with medium confidence or higher
- Tools that a server lists only for clients that declare roots, sampling or elicitation capabilities are not seen: the harness declares none
- Tool "sequentialthinking" is covered by the core checks only: string parameters only, and none names a path, URL, command, SQL or repository; add it under tools: to include it
- The sandbox is a convention the harness follows, not a security boundary. A malicious server runs with your user's privileges, sees the real file system and network, and can ignore cwd, HOME and PATH. Run untrusted servers in a throwaway VM or container.
- Prompt injection carried in tool output (only tool metadata is scanned)
- Authentication and transport security
- Audit logging (not measured by these packs; only the db pack has an advisory audit check)
Run it yourself
Started with the standard settings like this; put it in sealmark.yaml as the server:
npx -y @modelcontextprotocol/server-sequential-thinking@1.0.0
Each of 613 verdicts was checked independently, and Sealmark was wrong on some: how reliable Sealmark is.
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