Shadergraph

---
name: unity-shadergraph
description: "Shader Graph asset creation, structure inspection, constrained blackboard editing, and constrained node-subset editing for `.shadergraph` / `.shadersubgraph`. Use when users want to create graphs, inspect real node/slot structure, edit properties or keywords, or perform safe low-level node operations. Triggers: Shader Graph, shadergraph, sub graph, blackboard property, shader keyword, node editing, slot connect, 着色图, 子图, ShaderGraph 属性, ShaderGraph 节点, ShaderGraph 连线."
---

# ShaderGraph Skills

Shader Graph asset workflows for Unity 2022.3+ with source-backed template handling, MultiJson inspection, and constrained internal-editor reflection writes.

## Operating Mode

- Query skills (`shadergraph_list_templates`, `shadergraph_list_assets`, `shadergraph_get_info`, `shadergraph_get_structure`, `shadergraph_list_supported_nodes`, `shadergraph_list_properties`, `shadergraph_list_keywords`) are `SkillMode.SemiAuto` — they run in all three modes without grant.
- All other mutators (create graph / subgraph, add/move/connect/disconnect node, set node defaults/settings, add/update property/keyword, reimport) are `SkillMode.FullAuto` — under **Approval** they need user grant (grant triggers one server-side execute returning the result); under **Auto** / **Bypass** they execute directly.
- `shadergraph_remove_node`, `shadergraph_remove_property`, `shadergraph_remove_keyword` carry `SkillOperation.Delete` and are **auto-forbidden** in Approval / Auto modes (NeverInSemi). Only **Bypass** or the user-managed **Allowlist** can run them.

## Reflection Fragility

This module reaches into `UnityEditor.ShaderGraph` and `UnityEditor.ShaderGraph.Internal` via reflection (see `ShaderGraphReflectionHelper.cs` and `ShaderGraphNodeRegistry.cs`). The supported node whitelist, slot layout, and settings keys are version-pinned to `com.unity.shadergraph` 14.0.x (Unity 2022.3) with limited Unity 6 coverage. Treat the following as a hard contract:

- Never assume an internal type, field, or slot id exists from memory — always cross-check with `shadergraph_list_supported_nodes` and `shadergraph_get_structure` first.
- If a Shader Graph package update changes internal types or `MultiJson` schema, mutators may fail or silently no-op until the registry is updated.
- If a skill returns an error mentioning a reflection / type lookup failure, do not retry with different argument shapes — report the version mismatch and stop.

## Guardrails

**Routing**:
- HLSL text shaders: use `shader_*`
- Shader Graph / Sub Graph assets: use this module
- Source-anchored design guidance before proposing graph architecture: load [shadergraph-design](../shadergraph-design/SKILL.md)

**Runtime-first rules**:
- Always call `shadergraph_get_structure` before any node-level edit; treat returned `nodeId` and `slotId` as the only valid identifiers
- Never invent slot names, node ids, or template availability from memory
- `shadergraph_set_node_defaults` only applies to unconnected input slots; if the slot is connected, disconnect first
- `shadergraph_set_node_settings` only writes the whitelist exposed by `shadergraph_list_supported_nodes`
- `PropertyNode` only binds existing blackboard properties; create the property first with `shadergraph_add_property`
- SubGraph editing is limited to ordinary nodes; this module does not edit `SubGraphOutputNode` structure

**Validated behavior**:
- Unity 2022.3 + `com.unity.shadergraph@14.0.12` does not ship `GraphTemplates/`; `shadergraph_create_graph` falls back to blank graph creation
- Unity 6 ShaderGraph packages may provide actual template directories; template listing and template-copy creation remain available there
- The supported node subset is runtime-filtered. The shared overlap is 28 nodes in live validation, while `AppendVectorNode` is currently Unity 6 only

## Skills

### `shadergraph_list_templates`
List Shader Graph templates shipped by the installed package.

### `shadergraph_create_graph`
Create a Shader Graph asset from a package template or blank fallback.

### `shadergraph_create_subgraph`
Create a blank Shader Sub Graph asset with a configured output slot.

### `shadergraph_list_assets`
List Shader Graph and Sub Graph assets in the project.

### `shadergraph_get_info`
Get a high-level summary of a Shader Graph or Sub Graph asset.

### `shadergraph_get_structure`
Inspect the live graph structure. Returns real `nodeId`, `position`, `slots`, `edges`, `properties`, and `keywords`.

### `shadergraph_list_supported_nodes`
List the constrained node whitelist, supported versions, slots, and editable settings.

### `shadergraph_add_node`
Add a supported node by `nodeType` with optional initial settings and position.

### `shadergraph_remove_node`
Remove a node by serialized `nodeId`; related edges are removed together.

### `shadergraph_move_node`
Move a node by serialized `nodeId`.

### `shadergraph_connect_nodes`
Connect a specific output slot to a specific input slot using `nodeId + slotId`.

### `shadergraph_disconnect_nodes`
Disconnect one exact edge using the same four-tuple.

### `shadergraph_set_node_defaults`
Set the default value of an unconnected input slot.

### `shadergraph_set_node_settings`
Write whitelisted node settings only.

### `shadergraph_list_properties`
List graph blackboard properties.

### `shadergraph_add_property`
Add a constrained blackboard property.

### `shadergraph_update_property`
Update a constrained blackboard property.

### `shadergraph_remove_property`
Remove a graph property.

### `shadergraph_list_keywords`
List graph blackboard keywords.

### `shadergraph_add_keyword`
Add a graph keyword.

### `shadergraph_update_keyword`
Update a graph keyword.

### `shadergraph_remove_keyword`
Remove a graph keyword.

### `shadergraph_reimport`
Force reimport of a Shader Graph asset after external edits.

## Workflow

1. Create or locate the target graph.
2. Read `shadergraph_get_structure`.
3. If needed, create blackboard properties or keywords first.
4. Call `shadergraph_list_supported_nodes` to confirm node type, settings whitelist, and slot layout.
5. Add/move nodes, then connect/disconnect using the live `nodeId/slotId` values.
6. Re-read `shadergraph_get_structure` after each significant edit if the next step depends on topology.

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## Exact Signatures

Exact names, parameters, defaults, and returns are defined by `GET /skills/schema` or `unity_skills.get_skill_schema()`, not by this file.