List all glyphs in the open font with basic metadata.
AI agents call list_glyphs to retrieve information from Glyphs without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves metadata about glyphs in a font file without modifying, deleting, or executing operations. The word 'List' is a classic Read operation pattern. No creation, modification, deletion, code execution, or financial impact is described or implied. This falls clearly into the Read category with low severity since it only exposes existing font data.
From the tool's definition Tool name 'list_glyphs' and description 'List all glyphs in the open font with basic metadata' indicates data retrieval with no side effects.
Documented attack patterns abuse exactly the kind of access list_glyphs gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Glyphs, and nothing reaches the server without passing your rules. This is the rule we recommend for list_glyphs:
{
"version": "1",
"default": "deny",
"tools": {
"list_glyphs": {}
}
}list_glyphs is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List all glyphs in the open font with basic metadata. It is categorised as a Read tool in the Glyphs MCP Server, which means it retrieves data without modifying state.
Register the Glyphs MCP server in PolicyLayer and add a rule for list_glyphs: 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 Glyphs. Nothing to install.
list_glyphs 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 list_glyphs 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 list_glyphs. 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.
list_glyphs is provided by the Glyphs MCP server (nmassi/glyphs-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Glyphs, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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41 Glyphs tools catalogued and risk-classified — across an index of 43,000+ MCP servers.