mcp-devtools
A credential-free MCP server offering developer utilities such as JSON formatting, regex testing, hashing, UUID generation, base64 transforms, and JWT inspection, with no network dependencies.
Caution. Specific findings reduced this grade. They are listed on the page. Grades reflect the full trust pyramid: code, verification depth, and reputation. New projects cap at C until adoption is earned.
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VBSage
Source: Glama
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Install from
The grade above is for the source repository. Registries can serve a different version, so we mark the ones we were not able to read.
These names and descriptions are the publisher's own, read from the source code. We print them as written. Our assessment is the findings above, not this list.
json_toolsValidate and reshape a JSON string. mode=format pretty-prints, minify compacts, sort_keys recursively alphabetizes object keys. Returns a clear error for invalid JSON.
regex_testRun a JavaScript regular expression against a subject string and return each match with its index, positional capture groups, and any named groups. Flags are honored exactly: without the g flag only the first match is returned; with g, all matches.
hash_textCompute a cryptographic digest (hex) of UTF-8 text.
uuid_generateGenerate one or more RFC-4122 version-4 UUIDs (1–100).
base64_transformEncode or decode text as Base64, with an optional URL-safe alphabet.
jwt_inspectDecode a JWT's header and payload and report whether a signature segment is present and whether the token is expired. Does NOT verify the signature — decoding only.
Disclosed vulnerabilities in this server's declared npm dependencies (via OSV). Whether each is reachable depends on the installed versions.
@modelcontextprotocol/sdk has cross-client data leak via shared server/transport instance reuse
Anthropic's MCP TypeScript SDK has a ReDoS vulnerability
Model Context Protocol (MCP) TypeScript SDK does not enable DNS rebinding protection by default
Tool annotations
No tools have read-only/destructive annotations
Add readOnlyHint or destructiveHint annotations to every tool so hosts can warn users before invoking.
All four hints declared on every tool
6/6 tools missing one or more hints — json_tools (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); regex_test (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); hash_text (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +3 more. OpenAI's directory rejects tools where any of the four hints are missing or non-boolean.
For every tool, set all four hints (readOnlyHint, destructiveHint, idempotentHint, openWorldHint) to explicit true/false values that match the handler’s actual behaviour.
Tool handlers catch errors
Only 0/6 tool handlers wrap calls in try/catch (0%)
Wrap each tool handler body in try/catch and return a structured error response.
Tool test coverage
Only 0/6 tools referenced in tests (0%)
Write tests that reference each tool by name so every tool has at least one test.
Shell command execution
1 child_process call — runs shell commands
Prefer library functions over shell-outs. If you must shell out, ensure all inputs are properly escaped.
Production dependencies are patched
0 critical, 3 high severity in production deps — @modelcontextprotocol/sdk@1.12.0 (high), @modelcontextprotocol/sdk@1.12.0 (high)
Run npm audit fix, or upgrade the affected packages to a non-vulnerable version.
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