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feat(mcp): surface supported languages in MCP server instructions #678

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1 change: 1 addition & 0 deletions CHANGELOG.md
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Expand Up @@ -12,6 +12,7 @@ and adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
### New Features

- `codegraph status --json` now also reports the running CLI `version`, the index directory (`indexPath`), and a `lastIndexed` timestamp (ISO-8601, or null when nothing's indexed yet), so CI and scripts can pin the CLI version and check index freshness from a single command. A matching `CodeGraph.getLastIndexedAt()` library method exposes the same freshness check without shelling out. Thanks @12122J and @eddieran. (#329)
- When an agent connects over MCP, CodeGraph now states up front which languages it indexes — 20+, including TypeScript/JavaScript, Python, Go, Rust, Java, C#, C/C++, PHP, Ruby, Swift, and Kotlin — so agents no longer assume a language (such as Rust) isn't supported and skip the tools. (#671)

### Fixes

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4 changes: 3 additions & 1 deletion src/mcp/server-instructions.ts
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Expand Up @@ -18,7 +18,9 @@
export const SERVER_INSTRUCTIONS = `# Codegraph — code intelligence over an indexed knowledge graph

Codegraph is a SQLite knowledge graph of every symbol, edge, and file
in the workspace. Reads are sub-millisecond; the index lags writes by
in the workspace. It indexes 20+ languages — TypeScript/JavaScript,
Python, Go, Rust, Java, C#, C/C++, PHP, Ruby, Swift, Kotlin, and more.
Reads are sub-millisecond; the index lags writes by
about a second through the file watcher. Consult it BEFORE writing or
editing code, not during.

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