ts-lsp-mcp
An MCP server that provides TypeScript 7 native language server capabilities (go to definition, find references, hover types, diagnostics) to coding agents, using the Go-based tsc compiler for fast and accurate semantic analysis.
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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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.
ts_referencesFind all TRUE code references to a symbol, project-wide, via the TypeScript compiler. Give just `symbol` (a name, e.g. 'offerSpotToWaitlist') — no position needed. Prefer this over grep for code: it tracks the symbol rather than the string, so it follows aliased imports (`import { x as y }`), re-exp…
ts_hoverGet the inferred type signature and JSDoc for a symbol (the editor 'hover'). Give just `symbol`, or file/line/column. The fastest way to learn a symbol's actual type without reading its implementation.
ts_document_symbolsCompact outline of a file: classes, functions, methods, interfaces with 1-based positions. Use this to orient in an unfamiliar file without reading it fully. Default shows declarations only; depth:"all" adds locals inside function bodies.
ts_workspace_symbolsSearch symbols by name across the whole project (fuzzy, semantic index). Use to locate a class/function/type when you don't know which file it lives in.
ts_diagnosticsType-check a file and return compiler errors/warnings with code context. Run after editing to verify changes.
ts_server_infoReport which TypeScript language server binary is in use, its version, and the project root. Useful for debugging setup.
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
TS_LSP_PROJECT_ROOTProject root (default: cwd)TS_LSP_SERVER_PATHan explicit binary via --lsp-path /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 — ts_references (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); ts_hover (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); ts_document_symbols (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.
Descriptions match behaviour
1 tool describes read intent but its handler mutates — ts_hover (line 44: /^'([^']+)'/.exec(describe))
Rename the tool, rewrite the description, or move the side-effect into a separate clearly-named tool.
Tests exist
No test files found
Add tests that exercise each declared tool.
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.
Tool description accuracy
ts_hover: description implies read-only but handler writes/deletes/executes
Update tool descriptions to accurately reflect all capabilities — especially write, delete, or execute operations.
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