MCP MeasureMCP Measure

index observed

AISkills402

Tested AI agent skill files (SKILL.md), bought once over x402 for cents on Base. Free MCP search.

Should I use this

Quality & Safety

A
Description quality
95%
Schema completeness
80%
Naming quality
100%
Poisoning risk
100%
Permission match
100%
Protocol compliance
100%

Based on automated analysis of tool definitions and protocol compliance.

Context Cost

~3,620Tokens (tool definitions)
~10.3 KBTypical response size
Significant attention impact (2.83% of 128k context)

This is the approximate number of tokens consumed each time the server's tools are loaded into a model's context. Higher counts reduce the attention available for other tasks.

Install

One-Click Install

Add this to your `claude_desktop_config.json` file:

{
  "mcpServers": {
    "mcp": {
      "url": "https://mcp.aiskills402.com/mcp"
    }
  }
}

Remote endpoints

https://mcp.aiskills402.com/mcpstreamable-http

What it can do

Tool inventory

Tools (4)

🟢 Read-only🟡 Write🔴 Delete⚪ Unknown
🟢search_skills(query, category, tag, language, limit)

Search the tested agent skill files for sale (free). Give a plain-language query (for example: sound less like ChatGPT), or filter by category, tag or language, or combine them. With a query the results come ranked by relevance; without one you get the featured skills first. Each card has match_reason (the field that matched, or the filter), price_usd (a one-time purchase of the SKILL.md file, yours forever), what it is for, what it is not for, and how it was tested. limit is at most 24.

Input Schema

{
  "type": "object",
  "properties": {
    "query": {
      "description": "Plain-language search text, for example 'sound less like ChatGPT'. At most 100 characters. Omit it to get the featured skills first instead of a ranked search.",
      "type": "string",
      "maxLength": 100
    },
    "category": {
      "description": "Only skills in this category. One of: writing, editing, marketing, seo, research, code, agents, sales-support, business, data, translation, education (see list_categories). Any other value is an error.",
      "type": "string"
    },
    "tag": {
      "description": "Only skills with this tag: lowercase letters, digits and hyphens, at most 32 characters, for example 'humanize'.",
      "type": "string"
    },
    "language": {
      "description": "Only skills that work in this language: a 2-3 letter code such as en, bg or de, or 'any'. Skills marked 'any' always match.",
      "type": "string"
    },
    "limit": {
      "description": "How many skills to return, 1 to 24. Default 24.",
      "type": "integer",
      "minimum": 1,
      "maximum": 24
    }
  },
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Output Schema

{
  "type": "object",
  "properties": {
    "payment": {
      "anyOf": [
        {
          "type": "object",
          "propertyNames": {
            "type": "string"
          },
          "additionalProperties": {}
        },
        {
          "type": "null"
        }
      ],
      "description": "Payment summary shared by the skills (same as each card's payment); null when nothing matched."
    },
    "skills": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "slug": {
            "type": "string",
            "description": "Stable identifier of the skill; use it with get_skill."
          },
          "name": {
            "type": "string",
            "description": "Display name."
          },
          "version": {
            "type": "string",
            "description": "Current semantic version of the SKILL.md file."
          },
          "updated_at": {
            "type": "string",
            "description": "ISO 8601 time of the last update."
          },
          "use_when": {
            "type": "string",
            "description": "What the skill is for."
          },
          "not_for": {
            "anyOf": [
              {
                "type": "string"
              },
              {
                "type": "null"
              }
            ],
            "description": "What the skill is not for; null if not stated."
          },
          "languages": {
            "type": "array",
            "items": {
              "type": "string"
            },
            "description": "Language codes the skill works in, or 'any'."
          },
          "tags": {
            "type": "array",
            "items": {
              "type": "string"
            },
            "description": "Lowercase tags."
          },
          "category": {
            "anyOf": [
              {
                "type": "string"
              },
              {
                "type": "null"
              }
            ],
            "description": "Category slug; null if the skill has no category yet."
          },
          "category_url": {
            "anyOf": [
              {
                "type": "string"
              },
              {
                "type": "null"
              }
            ],
            "description": "Page of the category; null if there is no category."
          },
          "keywords": {
            "type": "array",
            "items": {
              "type": "string"
            },
            "description": "Search keywords."
          },
          "faq": {
            "type": "array",
            "items": {
              "type": "object",
              "properties": {
                "q": {
                  "type": "string"
                },
                "a": {
                  "type": "string"
                }
              },
              "required": [
                "q",
                "a"
              ],
              "additionalProperties": {}
            },
            "description": "Questions and answers about the skill."
          },
          "examples": {
            "type": "array",
            "items": {},
            "description": "Before/after examples from the test."
          },
          "page_url": {
            "type": "string",
            "description": "Public page of the skill."
          },
          "markdown_url": {
            "type": "string",
            "description": "The same page as Markdown."
          },
          "image_url": {
            "anyOf": [
              {
                "type": "string"
              },
              {
                "type": "null"
              }
            ],
            "description": "Preview image; null if none."
          },
          "related_url": {
            "type": "string",
            "description": "API address of the related skills."
          },
          "purchases_count": {
            "anyOf": [
              {
                "type": "number"
              },
              {
                "type": "null"
              }
            ],
            "description": "Number of purchases; null until there are at least 10."
          },
          "tested": {
            "anyOf": [
              {
                "type": "object",
                "propertyNames": {
                  "type": "string"
                },
                "additionalProperties": {}
              },
              {
                "type": "null"
              }
            ],
            "description": "How the skill was tested; null if not recorded."
          },
          "price_usd": {
            "type": "string",
            "description": "One-time price in US dollars, as a decimal string."
          },
          "price_micro": {
            "type": "number",
            "description": "The same price in millionths of a dollar."
          },
          "size_bytes": {
            "anyOf": [
              {
                "type": "number"
              },
              {
                "type": "null"
              }
            ],
            "description": "Size of the SKILL.md file in bytes."
          },
          "sha256": {
            "type": "string",
            "description": "SHA-256 of the file, lowercase hex."
          },
          "outline": {
            "type": "array",
            "items": {
              "type": "string"
            },
            "description": "Headings of the file."
          },
          "license": {
            "type": "object",
            "properties": {
              "summary": {
                "type": "string",
                "description": "The license in one sentence."
              },
              "holder": {
                "type": "string",
                "description": "Who holds the rights."
              },
              "url": {
                "type": "string",
                "description": "Page with the full license text."
              }
            },
            "required": [
              "summary",
              "holder",
              "url"
            ],
            "additionalProperties": {}
          },
          "buy_url": {
            "type": "string",
            "description": "HTTP address to buy the file (x402)."
          },
          "redownload_url_template": {
            "type": "string",
            "description": "HTTP address template of the free re-download; {token} is the receipt token."
          },
          "mcp_tool": {
            "type": "null",
            "description": "Always null: buying is over HTTP, not MCP."
          },
          "payment": {
            "type": "object",
            "properties": {
              "protocol": {
                "type": "string",
                "description": "Always 'x402'."
              },
              "scheme": {
                "type": "string",
                "description": "x402 scheme, 'exact'."
              },
              "asset": {
                "type": "string",
                "description": "Payment asset, 'USDC'."
              },
              "selling": {
                "type": "boolean",
                "description": "Whether the shop is open for payments right now."
              }
            },
            "required": [
              "protocol",
              "scheme",
              "asset",
              "selling"
            ],
            "additionalProperties": {},
            "description": "Short payment summary: protocol, asset, network and whether selling is open."
          },
          "match_reason": {
            "anyOf": [
              {
                "type": "string"
              },
              {
                "type": "null"
              }
            ],
            "description": "The field that matched the query (or the filter); null if there is no query or filter."
          }
        },
        "required": [
          "slug",
          "name",
          "version",
          "updated_at",
          "use_when",
          "not_for",
          "languages",
          "tags",
          "category",
          "category_url",
          "keywords",
          "faq",
          "examples",
          "page_url",
          "markdown_url",
          "image_url",
          "related_url",
          "purchases_count",
          "tested",
          "price_usd",
          "price_micro",
          "size_bytes",
          "sha256",
          "outline",
          "license",
          "buy_url",
          "redownload_url_template",
          "mcp_tool",
          "payment",
          "match_reason"
        ],
        "additionalProperties": {}
      },
      "description": "Matching skill cards, best first. Empty when nothing matched."
    }
  },
  "required": [
    "payment",
    "skills"
  ],
  "$schema": "http://json-schema.org/draft-07/schema#",
  "additionalProperties": false
}
🟢list_categories

List the twelve skill categories (free) with a short introduction and how many skills are listed in each. Use a slug as the category filter of search_skills.

Input Schema

{
  "type": "object",
  "properties": {},
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Output Schema

{
  "type": "object",
  "properties": {
    "categories": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "slug": {
            "type": "string",
            "description": "Category slug; use it as the category filter of search_skills."
          },
          "name": {
            "type": "string",
            "description": "Display name."
          },
          "position": {
            "type": "number",
            "description": "Order in the list, starting at 1."
          },
          "intro": {
            "type": "string",
            "description": "Short introduction to the category."
          },
          "keywords": {
            "type": "array",
            "items": {
              "type": "string"
            },
            "description": "Category keywords."
          },
          "listed_count": {
            "type": "number",
            "description": "How many skills are listed in the category."
          },
          "url": {
            "type": "string",
            "description": "Public page of the category."
          }
        },
        "required": [
          "slug",
          "name",
          "position",
          "intro",
          "keywords",
          "listed_count",
          "url"
        ],
        "additionalProperties": {}
      },
      "description": "All skill categories, in display order."
    }
  },
  "required": [
    "categories"
  ],
  "$schema": "http://json-schema.org/draft-07/schema#",
  "additionalProperties": false
}
🟢get_skill(slug)

Get one skill card (free) plus the exact x402 payment_required body for its one-time purchase of the SKILL.md file, and how_to_buy. Price is price_usd on the card. Buying is over HTTP; MCP does not take payments.

Input Schema

{
  "type": "object",
  "properties": {
    "slug": {
      "type": "string",
      "description": "The skill's slug, as returned by search_skills (for example 'humanize'). An unknown or unlisted slug is an error."
    }
  },
  "required": [
    "slug"
  ],
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Output Schema

{
  "type": "object",
  "properties": {
    "slug": {
      "type": "string",
      "description": "Stable identifier of the skill; use it with get_skill."
    },
    "name": {
      "type": "string",
      "description": "Display name."
    },
    "version": {
      "type": "string",
      "description": "Current semantic version of the SKILL.md file."
    },
    "updated_at": {
      "type": "string",
      "description": "ISO 8601 time of the last update."
    },
    "use_when": {
      "type": "string",
      "description": "What the skill is for."
    },
    "not_for": {
      "anyOf": [
        {
          "type": "string"
        },
        {
          "type": "null"
        }
      ],
      "description": "What the skill is not for; null if not stated."
    },
    "languages": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "description": "Language codes the skill works in, or 'any'."
    },
    "tags": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "description": "Lowercase tags."
    },
    "category": {
      "anyOf": [
        {
          "type": "string"
        },
        {
          "type": "null"
        }
      ],
      "description": "Category slug; null if the skill has no category yet."
    },
    "category_url": {
      "anyOf": [
        {
          "type": "string"
        },
        {
          "type": "null"
        }
      ],
      "description": "Page of the category; null if there is no category."
    },
    "keywords": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "description": "Search keywords."
    },
    "faq": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "q": {
            "type": "string"
          },
          "a": {
            "type": "string"
          }
        },
        "required": [
          "q",
          "a"
        ],
        "additionalProperties": {}
      },
      "description": "Questions and answers about the skill."
    },
    "examples": {
      "type": "array",
      "items": {},
      "description": "Before/after examples from the test."
    },
    "page_url": {
      "type": "string",
      "description": "Public page of the skill."
    },
    "markdown_url": {
      "type": "string",
      "description": "The same page as Markdown."
    },
    "image_url": {
      "anyOf": [
        {
          "type": "string"
        },
        {
          "type": "null"
        }
      ],
      "description": "Preview image; null if none."
    },
    "related_url": {
      "type": "string",
      "description": "API address of the related skills."
    },
    "purchases_count": {
      "anyOf": [
        {
          "type": "number"
        },
        {
          "type": "null"
        }
      ],
      "description": "Number of purchases; null until there are at least 10."
    },
    "tested": {
      "anyOf": [
        {
          "type": "object",
          "propertyNames": {
            "type": "string"
          },
          "additionalProperties": {}
        },
        {
          "type": "null"
        }
      ],
      "description": "How the skill was tested; null if not recorded."
    },
    "price_usd": {
      "type": "string",
      "description": "One-time price in US dollars, as a decimal string."
    },
    "price_micro": {
      "type": "number",
      "description": "The same price in millionths of a dollar."
    },
    "size_bytes": {
      "anyOf": [
        {
          "type": "number"
        },
        {
          "type": "null"
        }
      ],
      "description": "Size of the SKILL.md file in bytes."
    },
    "sha256": {
      "type": "string",
      "description": "SHA-256 of the file, lowercase hex."
    },
    "outline": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "description": "Headings of the file."
    },
    "license": {
      "type": "object",
      "properties": {
        "summary": {
          "type": "string",
          "description": "The license in one sentence."
        },
        "holder": {
          "type": "string",
          "description": "Who holds the rights."
        },
        "url": {
          "type": "string",
          "description": "Page with the full license text."
        }
      },
      "required": [
        "summary",
        "holder",
        "url"
      ],
      "additionalProperties": {}
    },
    "buy_url": {
      "type": "string",
      "description": "HTTP address to buy the file (x402)."
    },
    "redownload_url_template": {
      "type": "string",
      "description": "HTTP address template of the free re-download; {token} is the receipt token."
    },
    "mcp_tool": {
      "type": "null",
      "description": "Always null: buying is over HTTP, not MCP."
    },
    "payment": {
      "type": "object",
      "properties": {
        "protocol": {
          "type": "string",
          "description": "Always 'x402'."
        },
        "scheme": {
          "type": "string",
          "description": "x402 scheme, 'exact'."
        },
        "asset": {
          "type": "string",
          "description": "Payment asset, 'USDC'."
        },
        "selling": {
          "type": "boolean",
          "description": "Whether the shop is open for payments right now."
        }
      },
      "required": [
        "protocol",
        "scheme",
        "asset",
        "selling"
      ],
      "additionalProperties": {},
      "description": "Short payment summary: protocol, asset, network and whether selling is open."
    },
    "payment_required": {
      "type": "object",
      "properties": {
        "x402Version": {
          "type": "number",
          "description": "x402 protocol version, 2."
        },
        "accepts": {
          "type": "array",
          "items": {
            "type": "object",
            "properties": {},
            "additionalProperties": {}
          },
          "description": "Payment requirements to sign; sign accepts[0]."
        }
      },
      "required": [
        "x402Version",
        "accepts"
      ],
      "additionalProperties": {},
      "description": "The exact body the HTTP shop answers with HTTP 402; the client signs it. Buying is over HTTP."
    },
    "how_to_buy": {
      "type": "string",
      "description": "Steps to buy over HTTP."
    }
  },
  "required": [
    "slug",
    "name",
    "version",
    "updated_at",
    "use_when",
    "not_for",
    "languages",
    "tags",
    "category",
    "category_url",
    "keywords",
    "faq",
    "examples",
    "page_url",
    "markdown_url",
    "image_url",
    "related_url",
    "purchases_count",
    "tested",
    "price_usd",
    "price_micro",
    "size_bytes",
    "sha256",
    "outline",
    "license",
    "buy_url",
    "redownload_url_template",
    "mcp_tool",
    "payment",
    "payment_required",
    "how_to_buy"
  ],
  "$schema": "http://json-schema.org/draft-07/schema#",
  "additionalProperties": false
}
🟢redownload_skill(token)

Re-download the SKILL.md file you already bought (free), using the token from your purchase receipt. Always returns the current version of the skill.

Input Schema

{
  "type": "object",
  "properties": {
    "token": {
      "type": "string",
      "description": "The re-download token from your purchase receipt (the 'redownload' part): 64 lowercase hex characters. Not your payment signature."
    }
  },
  "required": [
    "token"
  ],
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Output Schema

{
  "type": "object",
  "properties": {
    "ok": {
      "type": "boolean",
      "const": true,
      "description": "Always true on success."
    },
    "skill": {
      "type": "string",
      "description": "Slug of the skill."
    },
    "name": {
      "type": "string",
      "description": "Display name."
    },
    "version": {
      "type": "string",
      "description": "The current version being delivered (may be newer than the one first bought)."
    },
    "sha256": {
      "type": "string",
      "description": "SHA-256 of the delivered file, lowercase hex."
    },
    "bytes": {
      "type": "number",
      "description": "Size of the file in bytes."
    },
    "license": {
      "type": "object",
      "properties": {
        "summary": {
          "type": "string",
          "description": "The license in one sentence."
        },
        "holder": {
          "type": "string",
          "description": "Who holds the rights."
        },
        "url": {
          "type": "string",
          "description": "Page with the full license text."
        }
      },
      "required": [
        "summary",
        "holder",
        "url"
      ],
      "additionalProperties": {}
    },
    "file": {
      "type": "object",
      "properties": {
        "name": {
          "type": "string",
          "description": "File name, 'SKILL.md'."
        },
        "encoding": {
          "type": "string",
          "description": "Text encoding of content, 'utf-8'."
        },
        "content": {
          "type": "string",
          "description": "The full SKILL.md text."
        }
      },
      "required": [
        "name",
        "encoding",
        "content"
      ],
      "additionalProperties": {},
      "description": "The file itself."
    },
    "install": {
      "type": "object",
      "properties": {
        "claude_code": {
          "type": "string",
          "description": "Where to put the file for Claude Code."
        },
        "generic": {
          "type": "string",
          "description": "The folder layout for any Agent Skills client."
        }
      },
      "required": [
        "claude_code",
        "generic"
      ],
      "additionalProperties": {},
      "description": "Where to install the file."
    },
    "changelog": {
      "anyOf": [
        {
          "type": "string"
        },
        {
          "type": "null"
        }
      ],
      "description": "What changed in this version; null if not recorded."
    },
    "purchase": {
      "type": "object",
      "properties": {
        "status": {
          "type": "string",
          "description": "Purchase state, for example 'active' or 'pending' (payment settlement not yet confirmed)."
        },
        "downloads": {
          "type": "number",
          "description": "How many times the file has been delivered, including this call."
        }
      },
      "required": [
        "status",
        "downloads"
      ],
      "additionalProperties": {},
      "description": "Your purchase record."
    }
  },
  "required": [
    "ok",
    "skill",
    "name",
    "version",
    "sha256",
    "bytes",
    "license",
    "file",
    "install",
    "changelog",
    "purchase"
  ],
  "$schema": "http://json-schema.org/draft-07/schema#",
  "additionalProperties": false
}

Community

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Evidence

Recent observations

verifiedversion not recorded4 tools
verifiedversion not recorded4 tools
verifiedversion not recorded4 tools
verifiedversion not recorded4 tools
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verifiedversion not recorded2 tools