Sprite sheet

Cut a png grid into a sprite sheet or a tileset, or place a walk cycle or shore tiles, for a 2D game in Godot or Unity.

Install

Point Hermes at this directory and enable cut-sprite-sheet. The manifest asks for Hermes >=0.21.6. There is no pip install. The tools do not read an API key and they do not send the png.

First picture

1. Cut the user's png. Omit cell_w and cell_h on inspect_grid when you want a suggested cell. The call does not cut. Then call slice_grid with both sizes.
2. A tight sheet (margin 0 and spacing 0) still writes SpriteFrames and a Unity Multiple slice. The png bytes stay. write false writes nothing.
3. Run godot --headless --editor --quit --path <project> once. Headless play cannot load the png before that import. Then play the stage. Do not open the Godot window.
4. The tools do not launch Godot or Unity. An existing project.godot is not changed. Set snap_2d_transforms_to_pixel and snap_2d_vertices_to_pixel yourself when the project already exists.
5. place_kit is only for a folder with no png. walk writes a colored 4-frame sheet and shore tiles. This plugin does not create a 3D model or a sound effect.

--probe checks playback and prints one PLAY line. The scene script is not an @tool script.

What stays out of the catalog

process/fix_alpha_border=false is written before Godot imports the png. A new sidecar has no uid line. A later slice keeps a uid:// line Godot already wrote. spriteExtrude stays 0. That field is mesh padding, not the spacing copy. The spacing copy is a separate png. Pixels per unit defaults to the cell height. The trial cells are 32. spriteMeshType 0 is Full Rect. spriteID ends with 0800000000000000 and is not the MD4 hex of the sprite name. internalIDToNameTable lists class 213. A gapped tileset names tiles.extruded.png in the slice json, and the Unity rects use that image. Unity Editor 6000.6.6f1 on macOS kept the walk-sheet fileIDs after a reopen, and the animation and prefab references stayed. Trial png guids are not shared. A shore map (peering in the tileset) puts each neighbor bit on its own atlas cell. Without that map the terrain is one tile. Unity water is an Animated Tile with three frames. Linux and Windows were not tested.

Music and an NPC voice are not created here. Audio is not sent.

Approval

slice_grid and place_kit register a pre_tool_call hook. A write (default write true) dry-runs first and returns {"action": "approve", "message": <one line of project-relative paths>}. inspect_grid, write false, and a dry-run that would not write return nothing, so Hermes does not ask.

Hermes then runs the same human gate as a dangerous shell command (hermes_cli/plugins.py _resolve_block_from_details → tools/approval.py request_tool_approval). CLI, gateway, and Desktop show that line. Choosing always covers only the same call (the same arguments) on later turns. After a yes, the handler dry-runs again and writes only when the plan still matches. If the files changed, it writes nothing.

This plugin does not read Hermes private internals. What Hermes does with the approve directive (v0.21.6 already has it; checked on v0.22.2):

• yolo (--yolo / /yolo) and approvals.mode: off skip the prompt and treat the call as approved (tools/approval.py _run_approval_gate).
• cron, -q, and unattended platforms follow approvals.cron_mode / single_query_mode / unattended_mode. The defaults are deny (hermes_cli/config_defaults.py).
• Any other non-interactive context with no person and no gateway fails closed.

The install scanner, with an empty HERMES_HOME, on both Hermes v0.22.2 and current main: Verdict: SAFE, 11 findings, Decision: ALLOWED — Allowed (community source, safe verdict). should_allow_plugin_install is Allowed (clean scan). The findings are tests that spawn Godot/lsof/grep, PNG byte fixtures, and path-refusal cases. They were not rewritten to hide from the scanner. --force is not required.

日本語

入れるのは、このディレクトリを Hermes に置いて cut-sprite-sheet を有効にするだけである。最初の成功は、利用者の png を inspect_grid してから slice_grid で切ることである。承認は 1 回で、pre_tool_call の 1 行が書くパスである。yolo と approvals off では Hermes がその場で承認を飛ばす。cron と -q と無人は既定で断る。切り直しでは、名前が一致するスプライトの pivot と border を残す。消える値は、その行に名指す。取り込みは godot --headless --editor --quit --path <project> の 1 回で、ウィンドウは開かない。そのあとステージを再生する。道具は Godot も Unity も起動しない。既にある project.godot は変えない。place_kit は png が無いときだけ使う。効果音は無い。