Get the user's current selection in GlyphsApp's editor.
AI agents call get_selection 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 performs a read-only query operation that returns information about what the user has selected in the editor. It does not modify, execute, or delete any data. The blast radius of misuse is minimal—an AI agent could only learn what is currently selected, which is already visible to the user in the UI.
From the tool's definition The tool retrieves the user's current selection in GlyphsApp's editor. The verb 'get' and the description indicate data retrieval with no side effects.
Documented attack patterns abuse exactly the kind of access get_selection 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 get_selection:
{
"version": "1",
"default": "deny",
"tools": {
"get_selection": {}
}
}get_selection is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get the user's current selection in GlyphsApp's editor. 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 get_selection: 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.
get_selection 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 get_selection 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 get_selection. 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.
get_selection 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.