This record as markdown: /tools/yanhuifair-godot-mcp/diff-resource.md
What diff_resource does on Godot
AI agents call diff_resource to retrieve information from Godot without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
path_a | string | Yes | First .tres resource path |
path_b | string | Yes | Second .tres resource path |
context_lines | object | — | Lines of context around diffs |
Parameters from the server's own tool schema.
Why diff_resource is rated Low
This tool performs a read-only comparison of two resource files. Diffing is a non-destructive, non-modifying operation that only queries and displays differences between existing resources. It has no side effects on the game project or resources. The blast radius of misuse is minimal—an agent could only waste time or expose resource contents to inspection.
From the tool's definition Tool name 'diff_resource' and description 'Compare two resource files' indicate a comparison operation that retrieves and analyzes data without modifying, deleting, or executing anything.
Attacks that exploit this kind of access
The rule that runs diff_resource safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Godot, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For diff_resource, this is the rule to start with:
diff_resource is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Godot, apply this rule, and every diff_resource call is checked against it from then on.
Questions about diff_resource
Compare two resource files. It is categorised as a Read tool in the Godot MCP Server, which means it retrieves data without modifying state.
diff_resource accepts 3 parameters: path_a, path_b, context_lines. Required: path_a, path_b. The full parameter table on this page comes from the server's own tool schema.
Register the Godot MCP server in PolicyLayer and add a rule for diff_resource: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Godot. Nothing to install.
diff_resource is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the diff_resource rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for diff_resource. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
diff_resource is provided by the Godot MCP server (@yanhuifair/godot-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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