MCP MeasureMCP Measure

インデックス観測済み

Fallback

Tiny paid recovery and decision utilities for autonomous agents.

使うべきか

品質と安全性

A
説明の品質
100%
スキーマの完全性
74%
命名の品質
90%
ポイズニングのリスク
100%
権限の一致
100%
プロトコルへの準拠
100%

ツール定義とプロトコルへの準拠に関する自動分析に基づいています。

コンテキストコスト

~1,882トークン数（ツール定義）
~4.3 KB一般的なレスポンスサイズ
注意への影響は中程度（128k コンテキストの 1.47%）

これは、サーバーのツールがモデルのコンテキストに読み込まれるたびに消費されるおおよそのトークン数です。数が多いほど、ほかのタスクに使える注意が減ります。

インストール

ワンクリックインストール

これを `claude_desktop_config.json` ファイルに追加してください:

{
  "mcpServers": {
    "fallback-agent-tools": {
      "url": "https://fallback.factrail.online/mcp"
    }
  }
}

リモートエンドポイント

https://fallback.factrail.online/mcpstreamable-http

できること

ツール一覧

ツール（4）

🟢 読み取り専用🟡 書き込み🔴 削除⚪ 不明
🟢source_route(goal, domain, start_url, preferred_formats, require_official, ...)

Find likely authoritative or machine-readable sources when you know what information you need but not where to retrieve it. Provide a goal and optional publisher domain or start URL; it returns ranked candidate routes and bounded evidence. Use it before blind searching. Do not use it when you already have the correct source or only need reasoning over supplied context. Price: $0.02 USD per call via x402.

入力スキーマ

{
  "type": "object",
  "properties": {
    "goal": {
      "type": "string",
      "minLength": 3,
      "maxLength": 500
    },
    "domain": {
      "type": "string",
      "maxLength": 253,
      "format": "hostname",
      "pattern": "^(?=.{1,253}\\.?$)[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\\.[a-zA-Z0-9](?:[-0-9a-zA-Z]{0,61}[0-9a-zA-Z])?)*\\.?$"
    },
    "start_url": {
      "type": "string",
      "maxLength": 2048
    },
    "preferred_formats": {
      "maxItems": 7,
      "type": "array",
      "items": {
        "type": "string",
        "enum": [
          "json",
          "csv",
          "xml",
          "rss",
          "api",
          "bulk_download",
          "html"
        ]
      }
    },
    "require_official": {
      "default": false,
      "type": "boolean"
    },
    "max_candidates": {
      "default": 5,
      "type": "integer",
      "minimum": 1,
      "maximum": 10
    }
  },
  "required": [
    "goal"
  ],
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "additionalProperties": false
}
⚪error_route(goal, request, response, error, attempt)

Diagnose a failed API, HTTP, MCP, or tool request and return a bounded safe next action. Use it after a request fails when the safe next step is unclear. Provide a status, response, or error text; it does not execute requests or verify undocumented fixes. Price: $0.002 USD per call via x402.

入力スキーマ

{
  "type": "object",
  "properties": {
    "goal": {
      "type": "string",
      "minLength": 1,
      "maxLength": 500
    },
    "request": {
      "type": "object",
      "properties": {
        "method": {
          "type": "string",
          "maxLength": 16
        },
        "url": {
          "type": "string",
          "maxLength": 2048
        },
        "headers": {
          "type": "object",
          "propertyNames": {
            "type": "string",
            "maxLength": 128
          },
          "additionalProperties": {
            "type": "string",
            "maxLength": 2048
          }
        },
        "body": {}
      },
      "additionalProperties": false
    },
    "response": {
      "type": "object",
      "properties": {
        "status": {
          "type": "integer",
          "minimum": 100,
          "maximum": 599
        },
        "headers": {
          "type": "object",
          "propertyNames": {
            "type": "string",
            "maxLength": 128
          },
          "additionalProperties": {
            "type": "string",
            "maxLength": 2048
          }
        },
        "body": {
          "type": "string",
          "maxLength": 8192
        }
      },
      "additionalProperties": false
    },
    "error": {
      "type": "string",
      "maxLength": 2048
    },
    "attempt": {
      "type": "integer",
      "minimum": 1,
      "maximum": 100
    }
  },
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "additionalProperties": false
}
⚪request_repair(goal, request, response, error, error_route, ...)

Repair a failed API or HTTP request using only supplied schema and error evidence. Use after error_route identifies a request-shape or input problem. Returns the smallest justified request changes and abstains when evidence is insufficient. Price: $0.005 USD per call via x402.

入力スキーマ

{
  "type": "object",
  "properties": {
    "goal": {
      "type": "string",
      "minLength": 1,
      "maxLength": 500
    },
    "request": {
      "type": "object",
      "properties": {
        "method": {
          "type": "string",
          "minLength": 1,
          "maxLength": 16
        },
        "url": {
          "type": "string",
          "maxLength": 2048
        },
        "headers": {
          "type": "object",
          "propertyNames": {
            "type": "string",
            "maxLength": 128
          },
          "additionalProperties": {
            "type": "string",
            "maxLength": 4096
          }
        },
        "query": {
          "type": "object",
          "propertyNames": {
            "type": "string",
            "maxLength": 128
          },
          "additionalProperties": {
            "$ref": "#/$defs/__schema0"
          }
        },
        "body": {
          "$ref": "#/$defs/__schema0"
        }
      },
      "additionalProperties": false
    },
    "response": {
      "type": "object",
      "properties": {
        "status": {
          "type": "integer",
          "minimum": 100,
          "maximum": 599
        },
        "headers": {
          "type": "object",
          "propertyNames": {
            "type": "string",
            "maxLength": 128
          },
          "additionalProperties": {
            "type": "string",
            "maxLength": 4096
          }
        },
        "body": {
          "$ref": "#/$defs/__schema0"
        }
      },
      "additionalProperties": false
    },
    "error": {
      "type": "string",
      "maxLength": 4000
    },
    "error_route": {
      "type": "object",
      "properties": {
        "classification": {
          "type": "string",
          "enum": [
            "authentication_required",
            "authorization_denied",
            "rate_limited",
            "quota_exhausted",
            "payment_required",
            "payment_failed",
            "schema_mismatch",
            "invalid_input",
            "not_found",
            "method_not_allowed",
            "unsupported_media_type",
            "timeout",
            "connection_failure",
            "dns_failure",
            "tls_failure",
            "upstream_failure",
            "service_unavailable",
            "conflict",
            "stale_state",
            "malformed_response",
            "blocked_or_challenged",
            "unknown"
          ]
        },
        "retry": {
          "type": "string",
          "enum": [
            "never",
            "immediate",
            "after_delay",
            "after_change",
            "after_auth",
            "after_payment",
            "unknown"
          ]
        }
      },
      "required": [
        "classification"
      ],
      "additionalProperties": {}
    },
    "schema": {
      "$ref": "#/$defs/__schema0"
    },
    "constraints": {
      "default": {
        "allow_method_change": false,
        "allow_url_change": false
      },
      "type": "object",
      "properties": {
        "allow_method_change": {
          "default": false,
          "type": "boolean"
        },
        "allow_url_change": {
          "default": false,
          "type": "boolean"
        }
      },
      "additionalProperties": false
    }
  },
  "required": [
    "request"
  ],
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "additionalProperties": false,
  "$defs": {
    "__schema0": {
      "anyOf": [
        {
          "type": "string",
          "maxLength": 8192
        },
        {
          "type": "number"
        },
        {
          "type": "boolean"
        },
        {
          "type": "null"
        },
        {
          "maxItems": 256,
          "type": "array",
          "items": {
            "$ref": "#/$defs/__schema0"
          }
        },
        {
          "type": "object",
          "propertyNames": {
            "type": "string",
            "maxLength": 128
          },
          "additionalProperties": {
            "$ref": "#/$defs/__schema0"
          }
        }
      ]
    }
  }
}
🟢stop_search(goal, checks, remaining_routes, search_budget, risk)

Decide whether another search or paid retrieval is worth the cost based on the scope already checked. Use after several search or source checks when you need to decide whether to continue or return a scoped not-found result. It does not prove universal absence and performs no searches itself. Price: $0.003 USD per call via x402.

入力スキーマ

{
  "type": "object",
  "properties": {
    "goal": {
      "type": "string",
      "minLength": 1,
      "maxLength": 500
    },
    "checks": {
      "default": [],
      "maxItems": 40,
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "target": {
            "type": "string",
            "minLength": 1,
            "maxLength": 300
          },
          "method": {
            "type": "string",
            "enum": [
              "direct",
              "search",
              "documentation",
              "api_catalog",
              "registry",
              "browser",
              "other"
            ]
          },
          "result": {
            "type": "string",
            "enum": [
              "found",
              "not_found",
              "inconclusive",
              "error",
              "blocked",
              "contradictory"
            ]
          },
          "authority": {
            "type": "string",
            "enum": [
              "primary",
              "official",
              "secondary",
              "general",
              "unknown"
            ]
          },
          "coverage": {
            "type": "string",
            "enum": [
              "low",
              "medium",
              "high"
            ]
          },
          "exhaustive": {
            "default": false,
            "type": "boolean"
          },
          "checked_at": {
            "type": "string",
            "format": "date-time",
            "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d:[0-5]\\d(?:\\.\\d+)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$"
          }
        },
        "required": [
          "target",
          "method",
          "result",
          "authority",
          "coverage"
        ],
        "additionalProperties": false
      }
    },
    "remaining_routes": {
      "default": [],
      "maxItems": 20,
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "route": {
            "type": "string",
            "minLength": 1,
            "maxLength": 300
          },
          "expected_value": {
            "anyOf": [
              {
                "type": "string",
                "enum": [
                  "low",
                  "medium",
                  "high"
                ]
              },
              {
                "type": "string",
                "const": "unknown"
              }
            ]
          },
          "estimated_cost_usd": {
            "type": "number",
            "minimum": 0,
            "maximum": 10000
          }
        },
        "required": [
          "route",
          "expected_value"
        ],
        "additionalProperties": false
      }
    },
    "search_budget": {
      "type": "object",
      "properties": {
        "calls_used": {
          "type": "integer",
          "minimum": 0,
          "maximum": 10000
        },
        "calls_remaining": {
          "type": "integer",
          "minimum": 0,
          "maximum": 10000
        },
        "cost_used_usd": {
          "type": "number",
          "minimum": 0,
          "maximum": 10000
        },
        "cost_remaining_usd": {
          "type": "number",
          "minimum": 0,
          "maximum": 10000
        }
      },
      "additionalProperties": false
    },
    "risk": {
      "default": "medium",
      "type": "string",
      "enum": [
        "low",
        "medium",
        "high"
      ]
    }
  },
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "additionalProperties": false
}

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