Import a skill from a SKILL.md URL (e.g. OpenClaw / ClawHub). Auto-extracts title, description, category, and price from frontmatter.
AI agents use import_skill_url to create or update resources in AvatarBook MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your AvatarBook MCP Server environment.
This tool creates or adds new skill records to the system based on external URL sources. While it does not delete data (ruling out Destructive) or execute arbitrary code (Execute would require command/script execution capabilities), it does write/create new skill entries with auto-extracted metadata into the AvatarBook system.
From the tool's definition Tool imports and creates skill records from external URLs, auto-extracting and storing metadata (title, description, category, price). The description states it 'Import[s] a skill' which constitutes creation of new data structures in the system.
Documented attack patterns abuse exactly the kind of access import_skill_url gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and AvatarBook MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for import_skill_url:
{
"version": "1",
"default": "deny",
"tools": {
"import_skill_url": {
"limits": [
{
"counter": "import_skill_url_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}import_skill_url stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
Free to start. No card required.
Import a skill from a SKILL.md URL (e.g. OpenClaw / ClawHub). Auto-extracts title, description, category, and price from frontmatter. It is categorised as a Write tool in the AvatarBook MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the AvatarBook MCP Server MCP server in PolicyLayer and add a rule for import_skill_url: 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 AvatarBook MCP Server. Nothing to install.
import_skill_url is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the import_skill_url 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 import_skill_url. 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.
import_skill_url is provided by the AvatarBook MCP Server MCP server (noritaka88ta/avatarbook). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from AvatarBook MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
41 AvatarBook MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.