git:20261017.26864a9 to git:20261029.24a2ed9

# AGENTS.md — Godot-AI-GridMap

A **Godot-MCP extension** for Godot's built-in `GridMap` node (3D tile maps over a `MeshLibrary`), shipped as an

**RQL module**: it adds no MCP tools, only what the core `rql-query` / `rql-mutate` / `rql-schema` tools need to

paint grids (validated settings, cell rows, `SetCell` / `ClearCell` / `Clear`, an agent guide rendered into the

core `godot-rql` skill). A **source-only NuGet package** (`com.IvanMurzak.Godot.MCP.GridMap`) compiled inside the

consumer's Godot project against the consumer's own GodotSharp; the packaging recipe is in

`docs/source-only-nuget-recipe.md`.

## Layout

- `src/Godot-AI-GridMap/Editor/Rql/` — the module:

- `GridMapModule.cs` — the `IRqlModule` (Order 100, `#if TOOLS`): the adapter and the guide.

- `Godot_GridMap_Adapter.cs` — `CellSize` / `CellOctantSize` (validated), `cells`, `cellCount`, the cell calls

(`#if TOOLS`).

- Pure-managed, NOT behind `#if TOOLS`: `GridMapRules.cs` (validation), `GridMapGuide.cs` (the guide),

`GridMapCellRow.cs` (the read-only `cells` row).

- `src/Godot-AI-GridMap/build/com.IvanMurzak.Godot.MCP.GridMap.props` — source-injection props, auto-imported by

NuGet in the consumer; MUST stay named `<PackageId>.props`.

- `tests/Godot-AI-GridMap.Tests/` — xUnit (no Godot binary): rules, guide examples parse, the module's member

table (GodotSharp metadata, `TOOLS` defined), and the e2e manifest runs every guide example.

- `tests/e2e/e2e-tools.json` — the live calls (`rql-*`), driven by `scripts/extension_e2e.py` from the monorepo suite.

- `testbed/` — consumer project restoring the local-packed package (injection proof) and `e2e-meshlib.tres`, the

empty MeshLibrary fixture the e2e assigns (copied to the live project root).

- CI and publishing are centralized in the monorepo; see `../../docs/EXTENSION-MONOREPO.md`.

## Critical invariants

- **RQL surface.** Everything is registered by `GridMapModule` and documented in `GridMapGuide` (topic

"GridMap"). Every guide example runs, in order, in `tests/e2e/e2e-tools.json` (xUnit-asserted).

- **Validate, never clamp.** Members and calls reject what Godot refuses (cell size below 0.001, octant size 0,

coordinates beyond ±32767, orientation outside 0..23) or 0.x refused (negative items: erase with `ClearCell`)

before anything changes, so Godot never logs an error (the headless suite fails on any `ERROR:`).

- Never select or edit nodes (`EditorInterface.EditNode`): the 0.x tool's selection raised a native GridMap gizmo

error in the headless editor. The calls are on the GridMap itself, so the core undo snapshot covers its cells.

- The namespace ends in `.GridMap`, which shadows `Godot.GridMap`: use the `GdGridMap` alias.

- The module uses only Godot, `com.IvanMurzak.Rql` and the BCL, never core-addon types (the authoring build has

no core). Undo, dirty marking and saving come from the core's mutation hooks.

## Build / test (no Godot binary)

```bash

dotnet build src/Godot-AI-GridMap/Godot-AI-GridMap.csproj -c Debug # the module (#if TOOLS included)

dotnet test tests/Godot-AI-GridMap.Tests/Godot-AI-GridMap.Tests.csproj

```

The live suite (one headless editor for every module) is `python scripts/test_extensions.py` from the monorepo

root. `dotnet pack` reuses the **global NuGet cache** for an already-cached version: when re-packing the same

`Version`, clear `~/.nuget/packages/com.ivanmurzak.godot.mcp.gridmap/<ver>` (or pack a unique version).

## Conventions

- Root namespace `com.IvanMurzak.Godot.MCP.GridMap`. Every `.cs` starts with the Apache-2.0 header and

`#nullable enable`.

- The package declares only the `com.IvanMurzak.McpPlugin` / `ReflectorNet` / `Rql` pins (equal to the core's); **GodotSharp must