{
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  "info": {
    "title": "Postgres MCP Server",
    "version": "1.0.0",
    "description": "OpenAPI definition for the Postgres MCP server. The API exposes schema discovery, SQL execution, performance insights, and health checks backed by a live PostgreSQL connection provided at request time.",
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          "name",
          "type"
        ]
      },
      "DatabaseObject": {
        "type": "object",
        "properties": {
          "schema": {
            "type": "string"
          },
          "name": {
            "type": "string"
          },
          "type": {
            "$ref": "#/components/schemas/ObjectType"
          },
          "owner": {
            "type": "string"
          },
          "comment": {
            "type": "string"
          },
          "definition": {
            "type": "string"
          },
          "columns": {
            "type": "array",
            "items": {
              "$ref": "#/components/schemas/ColumnDetail"
            }
          },
          "indexes": {
            "type": "array",
            "items": {
              "$ref": "#/components/schemas/IndexDetail"
            }
          },
          "dependencies": {
            "type": "array",
            "items": {
              "$ref": "#/components/schemas/ObjectDependency"
            }
          }
        },
        "required": [
          "schema",
          "name",
          "type"
        ]
      },
      "GetObjectDetailsResponse": {
        "type": "object",
        "properties": {
          "object": {
            "$ref": "#/components/schemas/DatabaseObject"
          }
        },
        "required": [
          "object"
        ]
      },
      "SqlParameters": {
        "type": "object",
        "description": "Mapping of named parameters to the values that should be bound when executing a statement.",
        "additionalProperties": {
          "$ref": "#/components/schemas/JsonValue"
        }
      },
      "ExecuteSqlRequest": {
        "type": "object",
        "properties": {
          "statement": {
            "type": "string",
            "description": "SQL statement to run against the target database"
          },
          "parameters": {
            "$ref": "#/components/schemas/SqlParameters"
          },
          "max_rows": {
            "type": "integer",
            "minimum": 1,
            "description": "Maximum number of result rows to return",
            "default": 500
          }
        },
        "required": [
          "statement"
        ]
      },
      "SqlResultColumn": {
        "type": "object",
        "properties": {
          "name": {
            "type": "string"
          },
          "data_type": {
            "type": "string"
          },
          "table": {
            "type": "string"
          },
          "nullable": {
            "type": "boolean"
          }
        },
        "required": [
          "name",
          "data_type"
        ]
      },
      "SqlResultRow": {
        "type": "array",
        "items": {
          "$ref": "#/components/schemas/JsonValue"
        }
      },
      "ExecuteSqlResponse": {
        "type": "object",
        "properties": {
          "columns": {
            "type": "array",
            "items": {
              "$ref": "#/components/schemas/SqlResultColumn"
            }
          },
          "rows": {
            "type": "array",
            "items": {
              "$ref": "#/components/schemas/SqlResultRow"
            }
          }
        },
        "required": [
          "columns",
          "rows"
        ]
      },
      "ExplainQueryRequest": {
        "type": "object",
        "properties": {
          "query": {
            "type": "string",
            "description": "SQL statement to explain"
          },
          "parameters": {
            "$ref": "#/components/schemas/SqlParameters"
          },
          "analyze": {
            "type": "boolean",
            "description": "Run EXPLAIN ANALYZE to execute the query",
            "default": false
          },
          "verbose": {
            "type": "boolean",
            "default": false
          },
          "costs": {
            "type": "boolean",
            "default": true
          },
          "buffers": {
            "type": "boolean",
            "default": false
          },
          "settings": {
            "type": "boolean",
            "default": false
          },
          "format": {
            "type": "string",
            "enum": [
              "text",
              "json",
              "yaml",
              "xml"
            ],
            "default": "json"
          }
        },
        "required": [
          "query"
        ]
      },
      "ExplainPlan": {
        "description": "Representation of the query plan returned by EXPLAIN.",
        "oneOf": [
          {
            "type": "string"
          },
          {
            "type": "object",
            "additionalProperties": true
          },
          {
            "type": "array",
            "items": {
              "$ref": "#/components/schemas/JsonValue"
            }
          }
        ]
      },
      "ExplainQueryResponse": {
        "type": "object",
        "properties": {
          "format": {
            "type": "string",
            "enum": [
              "text",
              "json",
              "yaml",
              "xml"
            ]
          },
          "plan": {
            "$ref": "#/components/schemas/ExplainPlan"
          }
        },
        "required": [
          "format",
          "plan"
        ]
      },
      "TopQuery": {
        "type": "object",
        "properties": {
          "query": {
            "type": "string"
          },
          "calls": {
            "type": "integer"
          },
          "total_time_ms": {
            "type": "number"
          },
          "mean_time_ms": {
            "type": "number"
          },
          "rows": {
            "type": "integer"
          },
          "shared_blks_hit": {
            "type": "integer"
          },
          "shared_blks_read": {
            "type": "integer"
          }
        },
        "required": [
          "query",
          "calls",
          "total_time_ms",
          "mean_time_ms"
        ]
      },
      "GetTopQueriesResponse": {
        "type": "object",
        "properties": {
          "queries": {
            "type": "array",
            "items": {
              "$ref": "#/components/schemas/TopQuery"
            }
          }
        },
        "required": [
          "queries"
        ]
      },
      "WorkloadQuery": {
        "type": "object",
        "properties": {
          "query": {
            "type": "string"
          },
          "parameters": {
            "$ref": "#/components/schemas/SqlParameters"
          },
          "frequency": {
            "type": "integer",
            "description": "Estimated executions per hour",
            "minimum": 1
          }
        },
        "required": [
          "query"
        ]
      },
      "AnalyzeWorkloadIndexesRequest": {
        "type": "object",
        "properties": {
          "workload": {
            "type": "array",
            "items": {
              "$ref": "#/components/schemas/WorkloadQuery"
            },
            "minItems": 1
          },
          "max_recommendations": {
            "type": "integer",
            "minimum": 1,
            "default": 5
          }
        },
        "required": [
          "workload"
        ]
      },
      "AnalyzeQueryIndexesRequest": {
        "type": "object",
        "properties": {
          "query": {
            "type": "string"
          },
          "parameters": {
            "$ref": "#/components/schemas/SqlParameters"
          },
          "max_recommendations": {
            "type": "integer",
            "minimum": 1,
            "default": 5
          }
        },
        "required": [
          "query"
        ]
      },
      "IndexRecommendation": {
        "type": "object",
        "properties": {
          "statement": {
            "type": "string"
          },
          "reason": {
            "type": "string"
          },
          "estimated_improvement_percent": {
            "type": "number"
          },
          "confidence": {
            "type": "string",
            "enum": [
              "low",
              "medium",
              "high"
            ]
          }
        },
        "required": [
          "statement",
          "reason"
        ]
      },
      "AnalyzeIndexesResponse": {
        "type": "object",
        "properties": {
          "recommendations": {
            "type": "array",
            "items": {
              "$ref": "#/components/schemas/IndexRecommendation"
            }
          }
        },
        "required": [
          "recommendations"
        ]
      },
      "HealthCheckStatus": {
        "type": "string",
        "enum": [
          "pass",
          "warn",
          "fail"
        ]
      },
      "HealthCheckResult": {
        "type": "object",
        "properties": {
          "check": {
            "type": "string"
          },
          "status": {
            "$ref": "#/components/schemas/HealthCheckStatus"
          },
          "message": {
            "type": "string"
          },
          "recommendations": {
            "type": "array",
            "items": {
              "type": "string"
            }
          },
          "details": {
            "type": "object",
            "additionalProperties": {
              "$ref": "#/components/schemas/JsonValue"
            }
          }
        },
        "required": [
          "check",
          "status"
        ]
      },
      "AnalyzeDbHealthResponse": {
        "type": "object",
        "properties": {
          "checks": {
            "type": "array",
            "items": {
              "$ref": "#/components/schemas/HealthCheckResult"
            }
          }
        },
        "required": [
          "checks"
        ]
      }
    }
  },
  "paths": {
    "/schemas": {
      "get": {
        "operationId": "list_schemas",
        "summary": "List available schemas",
        "description": "Return the schemas accessible through the provided Postgres connection.",
        "parameters": [
          {
            "name": "include_system_schemas",
            "in": "query",
            "description": "Whether to include system schemas such as `pg_catalog` and `information_schema`.",
            "required": false,
            "schema": {
              "type": "boolean",
              "default": false
            }
          }
        ],
        "responses": {
          "200": {
            "description": "Schemas visible to the connection user.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/ListSchemasResponse"
                }
              }
            }
          },
          "400": {
            "description": "The request payload or parameters were invalid.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/ErrorResponse"
                }
              }
            }
          },
          "401": {
            "description": "Authentication failed or connection string could not be used.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/ErrorResponse"
                }
              }
            }
          },
          "500": {
            "description": "Unexpected error while communicating with Postgres.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/ErrorResponse"
                }
              }
            }
          }
        }
      }
    },
    "/schemas/{schema}/objects": {
      "get": {
        "operationId": "list_objects",
        "summary": "List objects within a schema",
        "description": "Enumerate tables, views, functions, and other objects that live in the target schema.",
        "parameters": [
          {
            "name": "schema",
            "in": "path",
            "required": true,
            "description": "Schema name to inspect.",
            "schema": {
              "type": "string"
            }
          },
          {
            "name": "types",
            "in": "query",
            "description": "Filter results to one or more object types.",
            "required": false,
            "style": "form",
            "explode": false,
            "schema": {
              "type": "array",
              "items": {
                "$ref": "#/components/schemas/ObjectType"
              }
            }
          }
        ],
        "responses": {
          "200": {
            "description": "Objects that match the criteria.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/ListObjectsResponse"
                }
              }
            }
          },
          "400": {
            "description": "The request payload or parameters were invalid.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/ErrorResponse"
                }
              }
            }
          },
          "401": {
            "description": "Authentication failed or connection string could not be used.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/ErrorResponse"
                }
              }
            }
          },
          "500": {
            "description": "Unexpected error while communicating with Postgres.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/ErrorResponse"
                }
              }
            }
          }
        }
      }
    },
    "/schemas/{schema}/objects/{object}": {
      "get": {
        "operationId": "get_object_details",
        "summary": "Describe a database object",
        "description": "Return DDL, column metadata, indexes, and dependencies for a schema-qualified object.",
        "parameters": [
          {
            "name": "schema",
            "in": "path",
            "required": true,
            "schema": {
              "type": "string"
            },
            "description": "Schema that owns the object."
          },
          {
            "name": "object",
            "in": "path",
            "required": true,
            "schema": {
              "type": "string"
            },
            "description": "Name of the object to inspect."
          },
          {
            "name": "include_stats",
            "in": "query",
            "required": false,
            "schema": {
              "type": "boolean",
              "default": false
            },
            "description": "When true, include planner statistics and index usage details where available."
          }
        ],
        "responses": {
          "200": {
            "description": "Detailed metadata for the requested object.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/GetObjectDetailsResponse"
                }
              }
            }
          },
          "400": {
            "description": "The request payload or parameters were invalid.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/ErrorResponse"
                }
              }
            }
          },
          "401": {
            "description": "Authentication failed or connection string could not be used.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/ErrorResponse"
                }
              }
            }
          },
          "500": {
            "description": "Unexpected error while communicating with Postgres.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/ErrorResponse"
                }
              }
            }
          }
        }
      }
    },
    "/sql/execute": {
      "post": {
        "operationId": "execute_sql",
        "summary": "Execute arbitrary SQL",
        "description": "Run a SQL statement and return any resulting rows.",
        "requestBody": {
          "required": true,
          "content": {
            "application/json": {
              "schema": {
                "$ref": "#/components/schemas/ExecuteSqlRequest"
              }
            }
          }
        },
        "responses": {
          "200": {
            "description": "Execution results from the database.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/ExecuteSqlResponse"
                }
              }
            }
          },
          "400": {
            "description": "The request payload or parameters were invalid.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/ErrorResponse"
                }
              }
            }
          },
          "401": {
            "description": "Authentication failed or connection string could not be used.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/ErrorResponse"
                }
              }
            }
          },
          "500": {
            "description": "Unexpected error while communicating with Postgres.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/ErrorResponse"
                }
              }
            }
          }
        }
      }
    },
    "/sql/explain": {
      "post": {
        "operationId": "explain_query",
        "summary": "Explain a SQL statement",
        "description": "Return the execution plan produced by EXPLAIN or EXPLAIN ANALYZE.",
        "requestBody": {
          "required": true,
          "content": {
            "application/json": {
              "schema": {
                "$ref": "#/components/schemas/ExplainQueryRequest"
              }
            }
          }
        },
        "responses": {
          "200": {
            "description": "Query plan returned by Postgres.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/ExplainQueryResponse"
                }
              }
            }
          },
          "400": {
            "description": "The request payload or parameters were invalid.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/ErrorResponse"
                }
              }
            }
          },
          "401": {
            "description": "Authentication failed or connection string could not be used.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/ErrorResponse"
                }
              }
            }
          },
          "500": {
            "description": "Unexpected error while communicating with Postgres.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/ErrorResponse"
                }
              }
            }
          }
        }
      }
    },
    "/monitoring/top-queries": {
      "get": {
        "operationId": "get_top_queries",
        "summary": "Fetch high-cost queries",
        "description": "Return statements with the highest execution cost according to pg_stat_statements.",
        "parameters": [
          {
            "name": "interval_minutes",
            "in": "query",
            "required": false,
            "schema": {
              "type": "integer",
              "minimum": 1,
              "default": 60
            },
            "description": "How far back in minutes to consider statistics for ranking."
          },
          {
            "name": "limit",
            "in": "query",
            "required": false,
            "schema": {
              "type": "integer",
              "minimum": 1,
              "default": 10
            },
            "description": "Maximum number of queries to return."
          }
        ],
        "responses": {
          "200": {
            "description": "Top queries ordered by total execution time.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/GetTopQueriesResponse"
                }
              }
            }
          },
          "400": {
            "description": "The request payload or parameters were invalid.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/ErrorResponse"
                }
              }
            }
          },
          "401": {
            "description": "Authentication failed or connection string could not be used.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/ErrorResponse"
                }
              }
            }
          },
          "500": {
            "description": "Unexpected error while communicating with Postgres.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/ErrorResponse"
                }
              }
            }
          }
        }
      }
    },
    "/analysis/workload/indexes": {
      "post": {
        "operationId": "analyze_workload_indexes",
        "summary": "Recommend indexes for a workload",
        "description": "Suggest indexes that could improve performance for a representative workload of queries.",
        "requestBody": {
          "required": true,
          "content": {
            "application/json": {
              "schema": {
                "$ref": "#/components/schemas/AnalyzeWorkloadIndexesRequest"
              }
            }
          }
        },
        "responses": {
          "200": {
            "description": "Index recommendations tailored to the supplied workload.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/AnalyzeIndexesResponse"
                }
              }
            }
          },
          "400": {
            "description": "The request payload or parameters were invalid.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/ErrorResponse"
                }
              }
            }
          },
          "401": {
            "description": "Authentication failed or connection string could not be used.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/ErrorResponse"
                }
              }
            }
          },
          "500": {
            "description": "Unexpected error while communicating with Postgres.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/ErrorResponse"
                }
              }
            }
          }
        }
      }
    },
    "/analysis/query/indexes": {
      "post": {
        "operationId": "analyze_query_indexes",
        "summary": "Recommend indexes for a single query",
        "description": "Analyze a specific query and suggest indexes that could improve its execution plan.",
        "requestBody": {
          "required": true,
          "content": {
            "application/json": {
              "schema": {
                "$ref": "#/components/schemas/AnalyzeQueryIndexesRequest"
              }
            }
          }
        },
        "responses": {
          "200": {
            "description": "Index recommendations relevant to the query.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/AnalyzeIndexesResponse"
                }
              }
            }
          },
          "400": {
            "description": "The request payload or parameters were invalid.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/ErrorResponse"
                }
              }
            }
          },
          "401": {
            "description": "Authentication failed or connection string could not be used.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/ErrorResponse"
                }
              }
            }
          },
          "500": {
            "description": "Unexpected error while communicating with Postgres.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/ErrorResponse"
                }
              }
            }
          }
        }
      }
    },
    "/analysis/db-health": {
      "get": {
        "operationId": "analyze_db_health",
        "summary": "Assess database health",
        "description": "Run diagnostic checks against the connected database and report potential issues.",
        "parameters": [
          {
            "name": "include_diagnostics",
            "in": "query",
            "required": false,
            "schema": {
              "type": "boolean",
              "default": false
            },
            "description": "Include raw diagnostic data alongside summarized findings."
          }
        ],
        "responses": {
          "200": {
            "description": "Results of health checks and recommended actions.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/AnalyzeDbHealthResponse"
                }
              }
            }
          },
          "400": {
            "description": "The request payload or parameters were invalid.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/ErrorResponse"
                }
              }
            }
          },
          "401": {
            "description": "Authentication failed or connection string could not be used.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/ErrorResponse"
                }
              }
            }
          },
          "500": {
            "description": "Unexpected error while communicating with Postgres.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/ErrorResponse"
                }
              }
            }
          }
        }
      }
    }
  }
}