AI agents call get_stem_targets 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.
The tool name pattern 'get_*' combined with the server's role in 'AI-assisted type design' and companion tools that are all analysis/audit operations strongly suggests this retrieves stem measurement targets or design specifications from the font data. No indication of modification, deletion, code execution, or financial impact.
From the tool's definition Tool name 'get_stem_targets' indicates retrieval of stem target data; empty description limits specificity, but the 'get_' prefix is a strong read indicator.
Documented attack patterns abuse exactly the kind of access get_stem_targets 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_stem_targets:
{
"version": "1",
"default": "deny",
"tools": {
"get_stem_targets": {}
}
}get_stem_targets is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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get_stem_targets. 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_stem_targets: 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_stem_targets 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_stem_targets 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_stem_targets. 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_stem_targets 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.