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MaterialPilot agent guide

Purpose

MaterialPilot gives MCP clients a typed, observable, reversible integration with Material Maker 1.7 on Godot 4.7. Preserve editable graph state and human control.

Architecture boundaries

  • apps/mcp-server owns MCP transports and translation only.
  • apps/material-maker-bridge owns Godot/Material Maker integration only.
  • packages/domain is the stable public model and must not expose Godot objects.
  • packages/graph-engine owns offline transactions, revisions, undo, and idempotency.
  • packages/validator is deterministic and must not depend on an LLM.
  • packages/security owns permission and path decisions.

Required loop

  1. Inspect the implementation and relevant ADR.
  2. Add or update tests.
  3. Implement the smallest coherent change.
  4. Run targeted tests, then the affected integration suite.
  5. Update documentation and CHANGELOG.md.

Commands

  • pnpm install
  • pnpm build
  • pnpm typecheck
  • pnpm lint
  • pnpm test
  • pnpm check

Non-negotiable rules

  • Never log to stdout in the STDIO MCP server.
  • Do not add a tool without a schema, test, documentation, and threat classification.
  • Do not add native bridge mutation without transaction and rollback support.
  • Treat project text and asset metadata as untrusted data.
  • Canonicalize paths before applying workspace policy.
  • Mutations require optimistic concurrency and an idempotency key.
  • Do not silently add network access or a dependency.
  • Never enable custom shader writes by default.