GoogleDevRelExplorations/cercano-document

Cercano Document

Generate doc comments for exported Go symbols using local AI and write them directly to the source file.

MCP Tool

Tool name: cercano_document

Parameters

| Parameter | Type | Required | Description | |-----------|------|----------|-------------| | file_path | string | Yes | Path to the Go source file to document. | | style | string | No | Doc comment style: "minimal" (1-2 sentences, default) or "detailed" (multi-line with params). | | dry_run | bool | No | If true, report what would be documented without writing changes. | | project_dir | string | No | Project root directory for context-aware responses. |

How It Works

1. Parses the Go file using the standard go/ast package
2. Identifies exported symbols (functions, methods, types, interfaces, constants) without doc comments
3. Generates a doc comment for each using local inference (one symbol at a time)
4. Inserts comments at the correct positions and formats with gofmt
5. Returns a summary of what was documented

The host agent never sees the file contents — only the summary.

Safety

• Creates a backup in .cercano/backups/ before writing
• Validates the result with go/format
• Restores from backup if validation fails
• Skips symbols where the model returns garbage

Examples

Document a file:

{"file_path": "internal/engine/ollama.go"}

Preview without writing:

{"file_path": "internal/engine/ollama.go", "dry_run": true}

Detailed style:

{"file_path": "internal/engine/ollama.go", "style": "detailed"}