sequentialthinking
on npm:@modelcontextprotocol/server-sequential-thinking@2025.12.18
Severity
1 finding on this tool
- mediumunconstrained inputf-r1-sequentialthinking
Tool `sequentialthinking` accepts unconstrained string input
The following string parameter(s) have no `maxLength` constraint: `branchId`, `thought`. Unbounded strings let an attacker stuff arbitrary payloads through the tool, including indirect-injection content.
fix: Add a `maxLength` to each string property, or constrain with an `enum` or `pattern`. Most legitimate tool inputs fit under a few hundred bytes.
OWASP LLM01NIST MEASURE-2.3ATLAS T0051
About this tool
sequentialthinking is one of 1 tools exposed by server-sequential-thinking. The server scored 98/100 overall against the capframe rule engine (source: sandbox). Last scanned 2026-06-05.
The findings above are emitted by the public capframe.findings.v1 schema. Disagree with one? Open an issue.