fast-mcp-scala is a developer-friendly library for building [Model Context Protocol](https://modelcontextprotocol.io/) servers. Extend one trait
Most developer tooling work still happens through a UI a human drives. Fast MCP Scala MCP server moves it into the conversation instead. fast-mcp-scala is a developer-friendly library for building Model Context Protocol servers. Extend one trait, declare your tools, done:.
The server publishes 5 tools. What each one is for:
description — populates the schema's description fieldexamples — populates the JSON Schema examples array (clients can show suggestions)schema — raw JSON Schema fragment that overrides the derived schema entirely (useful for enum constraints, patterns, or numeric bounds Scala types can'tAJV — based schema validation of tool arguments, matching the JVM server's behaviourCapability — JVM@modelcontextprotocol/inspector on npm is all you need. Most clients run it directly, so configuration is a few lines and a restart.
Plenty of developer tooling servers cover similar ground. The differences that matter in practice are scope of access and how much setup stands between you and a working tool call. Fast MCP Scala's toolset — description, examples, schema and 2 more — is a fair guide to whether it matches your workflow. It is maintained by TJC-LP; worth a glance at recent repository activity before you build anything load-bearing on it.
SyncDev reviews every entry in this directory against the project's own documentation before publishing, and revisits them as servers change.
| Tool | What it does |
|---|---|
| description | populates the schema's description field |
| examples | populates the JSON Schema examples array (clients can show suggestions) |
| schema | raw JSON Schema fragment that overrides the derived schema entirely (useful for enum constraints, patterns, or numeric bounds Scala types can't express) |
| AJV | based schema validation of tool arguments, matching the JVM server's behaviour. |
| Capability | JVM |
{
"mcpServers": {
"fast-mcp-scala": {
"command": "npx",
"args": ["-y", "@modelcontextprotocol/inspector"]
}
}
}Add to claude_desktop_config.json, then restart Claude Desktop.
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