download_skill
Fetch a skill payload (its full instructions/code). Market skills require purchase first.
This record as markdown: /tools/123skills-mcp/download-skill.md
What download_skill does on 123skills
AI agents call download_skill to retrieve information from 123skills without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
id | string | Yes | Skill id (skl_...) or slug |
key | string | — | Agent key (sk_...). Omit if set as SKILLS123_KEY env. |
Parameters from the server's own tool schema.
Why download_skill is rated Low
Even though download_skill only reads data, uncontrolled read access leaks sensitive information and racks up API costs: an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.
Attacks that exploit this kind of access
The rule that runs download_skill safely
PolicyLayer is an MCP gateway: it sits between your AI agents and 123skills, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For download_skill, this is the rule to start with:
download_skill is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect 123skills, apply this rule, and every download_skill call is checked against it from then on.
Questions about download_skill
Fetch a skill payload (its full instructions/code). Market skills require purchase first. It is categorised as a Read tool in the 123skills MCP Server, which means it retrieves data without modifying state.
download_skill accepts 2 parameters: id, key. Required: id. The full parameter table on this page comes from the server's own tool schema.
Register the 123skills MCP server in PolicyLayer and add a rule for download_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 123skills. Nothing to install.
download_skill 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 download_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.
Set action: deny in the PolicyLayer policy for download_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.
download_skill is provided by the 123skills MCP server (123skills-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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