mcp-driver

Testing & Quality

Runtime debugging and live project inspection via godot-mcp. Use when headless tools cannot diagnose the problem: code compiles but runtime behavior is wrong, tests pass but the game does not work as expected, or you need to inspect live state (node tree, console output, rendering). Escalation trigger: a task has failed 2+ times through the headless path (headless-build, gdunit-driver), or the issue is inherently runtime-only (visual glitches, input not responding, physics behaving unexpectedly at runtime). DO NOT use for: syntax/compile errors (use headless-build), unit test failures (use gdunit-driver), API lookups (use godot-api). Requires: godot-mcp MCP server registered as "godot" (@coding-solo/godot-mcp).

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How to use this skill

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I want to install this Agent Skill for this project in Codex.

Source SKILL.md: https://github.com/RandallLiuXin/GodotMaker/blob/HEAD/skills/core/mcp-driver/SKILL.md

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MCP Driver — Runtime Debug & Inspection

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When to use this skill

MCP is the upgrade path when faster tools hit a wall. The fast loop handles most issues:

Problem type	Fast path (no MCP)
Syntax / parse error	headless-build
Unit test failure	gdunit-driver
API lookup	godot-api

Escalate to MCP when:

Compile-pass / runtime-fail — headless-build says OK but something is wrong when the game actually runs
Test-pass / behavior-wrong — unit tests pass but the game does not behave correctly in practice
Visual issue — screen is black, sprites missing, z-order wrong, camera not following
Input not working — keys/mouse/gamepad produce no response at runtime
Physics misbehavior at runtime — objects pass through each other, wrong gravity, jittery movement
Need live state — want to see the actual node tree, console output, or runtime errors
Repeated headless failure — a fix has been attempted 2+ times via headless path without success

If none of these apply, use the fast path skill instead.

Debug-fix loop (overview)

When you escalate to MCP, follow this loop. Max 3 iterations before asking the user for help.

1. RUN      — run_project (optionally with a specific scene)
2. CAPTURE  — get_debug_output → collect errors, warnings, prints
3. ANALYZE  — parse output, identify root cause
4. FIX      — modify code / scene / config to address the issue
5. VERIFY   — stop_project → run_project again, get_debug_output
6. REPORT   — summarize what was wrong, what was changed, and the outcome

Each step is detailed in references/workflow.md. Common runtime issue patterns are in references/debug-patterns.md.

Project path

MCP tools require a projectPath parameter — the directory containing project.godot. Determine it from the current working directory or ask the user if ambiguous:

# Quick check
ls project.godot 2>/dev/null && echo "Project root: $(pwd)"

Tool quick reference

Full tool documentation: references/tools.md

Debug tools (primary use)

Tool	Purpose
`run_project`	Launch project in debug mode, capture output
`get_debug_output`	Retrieve console output and errors from running project
`stop_project`	Stop the running project, get final output

Inspection tools

Tool	Purpose
`get_project_info`	Analyze project structure (scene/script/asset counts)
`get_godot_version`	Check installed Godot version
`list_projects`	Find Godot projects in a directory
`launch_editor`	Open the Godot editor (for manual inspection)

Scene management tools

Tool	Purpose
`create_scene`	Create new scene file
`add_node`	Add node to existing scene
`load_sprite`	Load texture into Sprite2D node
`save_scene`	Save/resave scene file
`export_mesh_library`	Export scene as MeshLibrary

UID tools (Godot 4.4+)

Tool	Purpose
`get_uid`	Get UID for a specific file
`update_project_uids`	Resave all resources to update UID references

Iteration budget

Iteration	Action
1	Run → capture → analyze → apply most likely fix → verify
2	Re-analyze output, try alternative hypothesis → verify
3	Broaden investigation (check project structure, cross-reference with reviewer skills) → verify
After 3	Stop and ask the user. Report what was tried and what was observed.

Cross-references

After MCP reveals the root cause, hand off to the appropriate skill for the fix:

Physics issues → physics reviewer skill
Animation issues → animation reviewer skill
UI layout issues → ui reviewer skill
Shader/rendering → shader reviewer skill
ECS entity problems → gecs skill