canvas_dump_shaders
Dump the linked shader programs (vertex + fragment source, uniforms) running on the target canvas. Uses engine introspection where available (Three.js renderer.info.programs, BABYLON.Effect.ShadersStore, Laya.Shader registry) and the WEBGL_debug_shaders extension to recover source where the drive...
This record as markdown: /tools/io-github-vmoranv-jshookmcp/canvas-dump-shaders.md
What canvas_dump_shaders does on Jshookmcp
AI agents call canvas_dump_shaders to retrieve information from Jshookmcp without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Why canvas_dump_shaders is rated Low
Tool retrieves and inspects shader metadata without modifying or executing arbitrary code.
From the tool's definition Dump shader programs, recover source, returns programs data
Attacks that exploit this kind of access
The rule that runs canvas_dump_shaders safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Jshookmcp, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For canvas_dump_shaders, this is the rule to start with:
canvas_dump_shaders 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 Jshookmcp, apply this rule, and every canvas_dump_shaders call is checked against it from then on.
Questions about canvas_dump_shaders
Dump the linked shader programs (vertex + fragment source, uniforms) running on the target canvas. Uses engine introspection where available (Three.js renderer.info.programs, BABYLON.Effect.ShadersStore, Laya.Shader registry) and the WEBGL_debug_shaders extension to recover source where the driver allows. Returns programs[] + an honest. It is categorised as a Read tool in the Jshookmcp MCP Server, which means it retrieves data without modifying state.
Register the Jshook MCP server in PolicyLayer and add a rule for canvas_dump_shaders: 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 Jshookmcp. Nothing to install.
canvas_dump_shaders 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 canvas_dump_shaders 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 canvas_dump_shaders. 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.
canvas_dump_shaders is provided by the Jshook MCP server (@jshookmcp/jshook). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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