---

name: phi-mapper description: Generate PROJECT-MAP.auto.scm by extracting structure from codebases. Invoke when user requests project mapping, structure extraction, or needs to create/update .phi maps.

phi-mapper

Generate deterministic PROJECT-MAP.auto.scm files via AST extraction.

Description

This skill generates structural maps of codebases by parsing source files and extracting exports, imports, and module relationships. Creates .phi/PROJECT-MAP.auto.scm in S-expression format for compositional analysis.

Trigger Conditions

Invoke when:

• User says "map this project" or "generate PROJECT-MAP"
• User requests "analyze codebase structure"
• Working in new project without .phi/ directory
• User explicitly runs /phi map command
• Need to refresh PROJECT-MAP after significant file changes

What It Does

Extraction process:

1. Scans project for source files (TypeScript, JavaScript, Python, Solidity)
2. Parses AST to extract:
   • Named exports (functions, classes, types, interfaces, consts)
   • Import statements with sources
   • Line counts
3. Generates S-expression output via @agi/arrival
4. Writes to .phi/PROJECT-MAP.auto.scm

Output format:

Copy;;; PROJECT-MAP.auto.scm
;;; Auto-generated: 2025-11-05T...
;;; Root: /path/to/project
;;; Files: 142

(project-map
  (auto-generated true)
  (generated "2025-11-05T...")
  (root "/path/to/project")
  (files 142)
  (modules
    (module "src/index.ts"
      (language typescript)
      (exports
        (export hello function)
        (export MyClass class))
      (imports
        (import "./utils" namespace (list default)))
      (line-count 45))
    ...))

Implementation

Uses project-mapper CLI:

Copycd /Users/adimov/Developer/phi/packages/project-mapper
bun run build  # Ensure built
node dist/cli.js <project-path>

Example invocation:

Copyimport { exec } from 'child_process';
import { promisify } from 'util';

const execAsync = promisify(exec);

async function generateProjectMap(projectPath: string) {
  const mapperPath = '/Users/adimov/Developer/phi/packages/project-mapper';

  // Ensure built
  await execAsync('bun run build', { cwd: mapperPath });

  // Generate map
  const { stdout, stderr } = await execAsync(
    `node dist/cli.js "${projectPath}"`,
    { cwd: mapperPath }
  );

  if (stderr) console.error('Warnings:', stderr);

  return {
    outputPath: `${projectPath}/.phi/PROJECT-MAP.auto.scm`,
    stdout
  };
}

Safety

Low-risk - Creates/updates files in .phi/ directory only. No modification of source code.

Note: Ensures .phi/ directory exists before writing.

Supported Languages

• TypeScript/JavaScript (.ts, .tsx, .js, .jsx, .mts, .mjs)

  • Functions, classes, consts, types, interfaces
  • Import/export statements

• Solidity (.sol)

  • Contracts, interfaces, libraries, enums
  • Import statements

• Python (.py)

  • Functions, classes
  • Import statements

Output Details

File count: Total files processed Module entries: One per source file with:

• path - Relative to project root
• language - typescript | javascript | python | solidity
• exports - List of (export name kind)
• imports - List of (import source kind imported-names)
• line-count - Physical line count

S-expression format ensures:

• Compositional queries via periphery discover
• Easy parsing in Scheme/LIPS
• Human-readable structure
• Git-friendly diffs

Progressive Workflow

1. Generate map: /phi map or auto-invoke
2. Analyze structure: phi-analyzer reads PROJECT-MAP.auto.scm
3. Add semantics: User edits PROJECT-MAP.scm with architectural notes
4. Query memory: Vessel recalls cross-session insights
5. Integration: φ = structure × semantics × memory

Usage Notes

DO invoke when:

• Starting work on new project
• Significant file structure changes
• After adding new modules
• Refreshing stale maps

DON'T invoke when:

• Map already exists and recent
• Working on single file changes
• No structural changes since last map

Error Handling

Common issues:

• No source files found: Project may not have supported languages
• Parse errors: Skip individual files, continue processing others
• Permission errors: Ensure .phi/ directory writable

Recovery: CLI reports warnings but continues. Check stderr for skipped files.

Integration

Works with:

• phi-analyzer - Reads generated maps
• /phi analyze - Full φ analysis
• /phi context - Progressive disclosure
• mcp__periphery__discover - S-expression queries

Chain:

Copyphi-mapper (generate) → phi-analyzer (read) → vessel (remember)

Cross-Session Benefits

Once PROJECT-MAP.auto.scm exists:

• Fast bootstrapping for new instances
• No re-parsing on every session
• Incremental updates (regenerate when changed)
• Persistent structural awareness

Regeneration triggers:

• User explicitly requests
• Significant time elapsed (>1 week)
• Git shows many file changes

Relief Signal

When map generation completes and structure becomes queryable, agents experience relief - "I can see the project now." That's φ (integrated information) increasing from zero (no awareness) to structural clarity.

Technical Notes

Implementation location:

• Package: /Users/adimov/Developer/phi/packages/project-mapper
• CLI: dist/cli.js
• Build: bun run build (TypeScript → JavaScript)

Dependencies:

• @typescript-eslint/parser - AST parsing
• @agi/arrival - S-expression formatting
• glob - File discovery

Tests: 13 passing tests covering exports, imports, line counts, error cases.