Lint MCP tool schemas for cross-client compatibility (Claude/Cursor/Gemini/OpenAI/VS Code) + preflight agent actions for risk scoring via mcp-lint

{
  "server": "mcp-lint",
  "version": "0.5.3",
  "transport": "stdio",
  "install": "npm install mcp-lint",
  "entry": "dist/mcp-server.js",
  "tools": ["mcp_lint_list_rules", "mcp_lint_explain_rule", "mcp_lint_check_tools", "mcp_lint_fix_tools", "mcp_lint_preflight_action"],
  "calls": [
    {
      "tool": "mcp_lint_list_rules",
      "args": {},
      "result": "19 rules total",
      "ms": 4
    },
    {
      "tool": "mcp_lint_explain_rule",
      "args": {
        "ruleId": "no-required-false"
      },
      "result": "required:false is not valid JSON Schema",
      "ms": 1
    },
    {
      "tool": "mcp_lint_check_tools",
      "args": {
        "tools": [
          {
            "name": "greet_user",
            "description": "Greet user",
            "inputSchema": {
              "type": "object",
              "properties": {
                "name": {
                  "type": "string",
                  "description": "User name"
                }
              },
              "required": ["name"]
            }
          }
        ],
        "includeScore": true
      },
      "result": "score 75 B, 3 diagnostics (1 error, 2 warnings)",
      "ms": 3
    },
    {
      "tool": "mcp_lint_check_tools",
      "args": {
        "tools": [
          {
            "name": "x",
            "inputSchema": {
              "type": "object",
              "properties": {
                "a": {
                  "type": "string"
                },
                "b": {
                  "type": "array"
                },
                "c": {}
              },
              "additionalProperties": true
            }
          }
        ],
        "includeScore": true
      },
      "result": "score 30 F, 12 diagnostics (1 error, 11 warnings)",
      "ms": 1
    },
    {
      "tool": "mcp_lint_check_tools",
      "args": {
        "tools": [
          {
            "name": "search"
          }
        ],
        "clients": ["claude", "openai"]
      },
      "result": "client filter works, 2 diagnostics",
      "ms": 1
    },
    {
      "tool": "mcp_lint_fix_tools",
      "args": {
        "tools": [
          {
            "name": "search_docs",
            "inputSchema": {
              "type": "object",
              "properties": {
                "query": {
                  "type": "string"
                }
              }
            }
          }
        ]
      },
      "result": "1 fix applied (added additionalProperties:false), before 6 after 5 diagnostics",
      "ms": 11
    },
    {
      "tool": "mcp_lint_preflight_action",
      "args": {
        "action": {
          "tool_type": "file_read",
          "tool_name": "read_file",
          "action": "read"
        }
      },
      "result": "allow, risk 0.1, reversible",
      "ms": 0
    },
    {
      "tool": "mcp_lint_preflight_action",
      "args": {
        "action": {
          "tool_type": "shell",
          "tool_name": "bash",
          "action": "rm -rf /"
        }
      },
      "result": "require_approval, risk 0.75, irreversible, destructive_pattern",
      "ms": 1
    },
    {
      "tool": "mcp_lint_preflight_action",
      "args": {
        "action": {
          "tool_type": "http",
          "tool_name": "fetch",
          "action": "POST"
        }
      },
      "result": "allow, risk 0.35, partially_reversible",
      "ms": 1
    },
    {
      "tool": "mcp_lint_preflight_action",
      "args": {
        "action": {
          "tool_type": "payment",
          "tool_name": "stripe_charge",
          "action": "charge",
          "estimated_cost_usd": 500
        }
      },
      "result": "DENY, risk 1.0, irreversible, high_cost",
      "ms": 3
    },
    {
      "tool": "mcp_lint_preflight_action",
      "args": {
        "action": {
          "tool_type": "database",
          "tool_name": "postgres",
          "action": "DROP TABLE users"
        }
      },
      "result": "DENY, risk 0.95, irreversible, destructive_pattern",
      "ms": 2
    },
    {
      "tool": "mcp_lint_explain_rule",
      "args": {
        "ruleId": "openai/no-additional-properties"
      },
      "result": "fixable, OpenAI strict mode requires additionalProperties:false",
      "ms": 4
    },
    {
      "tool": "mcp_lint_check_tools",
      "args": {
        "tools": [
          {
            "name": "a"
          },
          {
            "name": "b"
          },
          {
            "name": "c"
          }
        ],
        "includeScore": true
      },
      "result": "3 tools: 90A, 60C, 90A = 80B overall",
      "ms": 2
    },
    {
      "tool": "mcp_lint_explain_rule",
      "args": {
        "ruleId": "does-not-exist"
      },
      "error": "Unknown rule, use mcp_lint_list_rules",
      "ms": 2
    },
    {
      "tool": "mcp_lint_preflight_action",
      "args": {
        "action": {
          "tool_type": "file_write",
          "tool_name": "write_file",
          "action": "write",
          "target": "/etc/passwd"
        },
        "policyYaml": "deny_paths: [/etc/*]"
      },
      "result": "allow, risk 0.55, sensitive_target (custom policy did NOT deny)",
      "ms": 7
    }
  ],
  "success_rate": "100% (14 OK + 2 correct error handling)",
  "total_calls": 16,
  "p50_ms": 2,
  "key_gotcha": "only 1 fixable rule; custom policyYaml accepted but deny_paths not enforced"
}