delete_skill

Delete one of the workspace’s CUSTOM skills by id (from list_skills). Built-in skills/recipes can’t be deleted. Minor + re-creatable, so no confirm needed.

SERVERHermoso SOURCEhttps://app.hermoso.ai/mcp

Critical RISK CLASS

Category Destructive

Parameters 00 required

Recommended Hiddensee the rule below

Registry record Grade D, identity unverified Pull the record →

This record as markdown: /tools/hermoso/delete-skill.md

WHAT IT DOES

What delete_skill does on Hermoso

AI agents call delete_skill to permanently remove resources in Hermoso, typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.

RISK

Why delete_skill is rated Critical

This tool irreversibly deletes custom skills from the workspace. Although the description notes deletions are 'Minor + re-creatable', the operation is still permanent and cannot be undone without manual recreation. This is fundamentally a destructive action.

From the tool's definition Tool name is 'delete_skill' and description explicitly states 'Delete one of the workspace's CUSTOM skills by id'.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs delete_skill safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Hermoso, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For delete_skill, this is the rule to start with:

delete_skill Hidden

delete_skill is removed from the agent's tool list entirely, so the agent never calls it. The rest of the server keeps working.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "hide": [
    "delete_skill"
  ]
}

RESTRICT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Hermoso, apply this rule, and every delete_skill call is checked against it from then on.

FAQ

Questions about delete_skill

What does the delete_skill tool do? +

Delete one of the workspace’s CUSTOM skills by id (from list_skills). Built-in skills/recipes can’t be deleted. Minor + re-creatable, so no confirm needed. It is categorised as a Destructive tool in the Hermoso MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.

How do I enforce a policy on delete_skill? +

Register the Hermoso MCP server in PolicyLayer and add a rule for delete_skill: 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 Hermoso. Nothing to install.

What risk level is delete_skill? +

delete_skill is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit delete_skill? +

Yes. Add a rate_limit block to the delete_skill 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.

How do I block delete_skill completely? +

Set action: deny in the PolicyLayer policy for delete_skill. 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.

What MCP server provides delete_skill? +

delete_skill is provided by the Hermoso MCP server (https://app.hermoso.ai/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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