Language ServerSAFE
Overview
From the repository's own README, as read at the audited commit. Badges and raw HTML are left out.
A Model Context Protocol (MCP) server providing language support for code editing.
This is a TypeScript-based MCP server designed to enhance code editing experiences by providing features such as hover information, code completion, and diagnostics. It demonstrates core MCP concepts by providing:
- Language-specific tools for code analysis and manipulation
- Integration with the Model Context Protocol for seamless communication
Features
Language Support
- Provides hover information for symbols in code
- Offers code completion suggestions
- Reports diagnostic information (errors, warnings)
- Only tested with typescript, theoretically should support Python. Would love to add additional language servers or be more agnostic if possible.
MCP Integration
- Implements the MCP protocol for communication with clients
- Exposes language features as MCP tools
Tools
get_hover: Get hover information for a position in a document- Takes languageId, filePath, content, line, and character as required parameters
get_completions: Get completion suggestions for a position in a document- Takes languageId, filePath, content, line, and character as required parameters
get_diagnostics: Get diagnostic information for a document- Takes languageId, filePath, and content as required parameters
Development
Install dependencies:
npm install
Build the server:
npm run build
For development with auto-rebuild:
npm run watch
Installation
To use with Claude Desktop, add the server config:
On MacOS: ~/Library/Application Support/Claude/claude_desktop_config.json On Windows: %APPDATA%/Claude/claude_desktop_config.json
{
"mcpServers": {
"language-server-mcp": {
"command": "/path/to/la079be576f3ddOBSERVED · 2026-10-08Connect
Built from this server's own package name, version and transport as found in its source — not copied from anyone's documentation, so it cannot drift against a page we do not control.
claude mcp add language-server-mcp -- npx -y [email protected]
{
"mcpServers": {
"language-server-mcp": {
"command": "npx",
"args": [
"-y",
"[email protected]"
]
}
}
}Exposed tools (3)
3 read · 0 write · 0 destructive.
| Tool | Risk | Description |
|---|---|---|
get_completions | read | Get completion suggestions for a position in a document |
get_diagnostics | read | Get diagnostic information for a document |
get_hover | read | Get hover information for a position in a document |
Trust audit
SAFEgrade B · trust 89/100 Nothing in the source contradicts what it says it does. Grade A is reserved for packages that have also passed the behavioural sandbox.
| Layer | What it checks | Result |
|---|---|---|
| L0 | Provenance & inventory | PASS |
| L1 | Static analysis of the code | PASS |
| L2 | Instruction surface (what it tells the agent) | PASS |
| L3 | Class-specific surface | PASS |
| L4 | Behavioural (sandbox) | SKIPPED |
What the source does
- Filesystem
- none-observed
- Network
- none-observed
- Shell
- none-observed
- Dependencies
- not all pinned
- Secrets in source
- none-found
Findings (3)
vscode-jsonrpc, vscode-languageclient, vscode-languageserver-protocol, vscode-languageserver-types, @types/jest, @types/node, jest, ts-jest
load_dotenv() # load environment variables from .env
curl -LsSf https://astral.sh/uv/install.sh | sh
Gates applied: no_behavioural_pass.
079be576f3ddfull audit observations/trust-audit/mcp-server/alexwohletz__language-server-1.json · Report an issue / request a re-scanAudit history
Every audit this server has had. A grade with a past is a grade somebody is still checking.
| Date | Source | Verdict | Grade | Score | Change |
|---|---|---|---|---|---|
| 2026-10-08 | 079be576f3dd | SAFE | B | 89 | first audit |
Questions
What tools does Language Server expose?
3 in total: 3 read-only, 0 that write, and 0 that can delete or overwrite. Every one is listed on this page with its risk.
Is Language Server safe to connect to an agent?
The audit found nothing in the source that contradicts what it says it does, and graded it B (89/100). Grade A is held back for packages that have also passed a sandboxed behavioural run, which is why a clean server reads B.
What credentials does Language Server need?
No credential environment variables were found in its source, so it appears to need none.
How does Language Server run?
It speaks stdio, so it runs as a local process your client starts. It is published on npm as language-server-mcp at 0.1.0.
How current is this page?
The grade is for one exact copy of the source (079be576f3dd), read on 2026-10-08. The repository is watched and re-audited when it changes.