Senado BR — Brazilian Federal Senate Open Data

Listar blocos parlamentares

senado_listar_blocos

Read-onlyIdempotent

List all Brazilian Senate parliamentary blocs and their member parties, including historical composition, to identify current members and obtain bloc codes for further details.

Instructions

Lista todos os blocos parlamentares do Senado e seus partidos membros. Retorna { count, blocos }, onde cada bloco traz codigo, nome, nomeApelido, dataCriacao, dataExtincao e a lista partidos (cada um com sigla, nome, dataAdesao, dataDesligamento). A lista inclui a composição HISTÓRICA de cada bloco: partido com dataDesligamento preenchida já saiu (a composição atual são os com dataDesligamento null) e o mesmo partido pode repetir com períodos de adesão distintos — sem esse filtro um partido parece estar em 2 blocos ao mesmo tempo. Use para descobrir o codigo de um bloco e depois detalhá-lo via senado_obter_bloco; para lideranças use senado_liderancas.

Tool call template

This tool declares no required parameters. Add optional parameters from the input schema as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {},
    "name": "senado_listar_blocos"
  }
}

Input Schema

Name	Required	Description	Default
No arguments

Output Schema

Name	Required	Description	Default
`provenance`	Yes	Bloco de proveniência do portfólio (projeção concise): source, source_url, data_vintage, retrieved_at (horário de Brasília), citation, license, revision e retrieval; field_sources só quando a resposta funde recortes, derived e derivation_note só nos modos de estatísticas. retrieval é o diagnóstico da ida à origem nesta chamada — requisições, tentativas com retentativas, anomalias superadas (timeout, network, rate_limited, http_5xx, http_4xx, malformed_body) e unstable (true quando algo precisou ser repetido) —, ou null quando não foi medido. Lista de blocos quando a chamada consulta várias fontes (índice do search).
`attribution`	Yes	URLs de origem dos dados (as source_url distintas dos blocos de proveniência, incluindo as de field_sources), para linkar a citação

Schema Changelog

Changes observed during successful MCP inspections.

Changed2 schema fields changedv3.23.0Oct 29, 2026

addedOutput schema / properties / attribution / description

Added value: +"URLs de origem dos dados (as source_url distintas dos blocos de proveniência, incluindo as de field_sources), para linkar a citação"

addedOutput schema / properties / provenance / description

Added value: +"Bloco de proveniência do portfólio (projeção concise): source, source_url, data_vintage, retrieved_at (horário de Brasília), citation, license, revision e retrieval; field_sources só quando a resposta funde recortes, derived e derivation_note só nos modos de estatísticas. retrieval é o diagnóstico da ida à origem nesta chamada — requisições, tentativas com retentativas, anomalias superadas (timeout, network, rate_limited, http_5xx, http_4xx, malformed_body) e unstable (true quando algo precisou ser repetido) —, ou null quando não foi medido. Lista de blocos quando a chamada consulta várias fontes (índice do search)."

Changed1 schema field changedv3.18.4Oct 14, 2026

changedOutput schema / properties / provenance / anyOf

Previous value: -[
-  {
-    "additionalProperties": false,
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-      "citation": {
-        "type": "string"
-      },
-      "data_vintage": {
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-          "properties": {
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-              "type": [
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-              "type": "string"
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-            "source_url",
-            "dataset_id",
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-            "retrieved_at"
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-          "type": "object"
-        },
-        "minItems": 1,
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-      "license": {
-        "type": [
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-      "retrieval": {
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-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "retrieved_at": {
-        "type": "string"
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-      "source": {
-        "type": "string"
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-      "source_url": {
-        "type": "string"
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-    "required": [
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-      "license"
-    ],
-    "type": "object"
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-  {
-    "items": {
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-        "citation": {
-          "type": "string"
-        },
-        "data_vintage": {
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-            "null"
-          ]
-        },
-        "field_sources": {
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-            "properties": {
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-                "type": [
-                  "boolean",
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-        "license": {
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-            "string",
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-          ]
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-        "retrieval": {
-          "anyOf": [
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-                        "type": "integer"
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-                        "enum": [
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-                          "http_5xx",
-                          "rate_limited",
-                          "malformed_body"
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-                "unstable": {
-                  "type": "boolean"
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-              "required": [
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-              "type": "object"
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-            {
-              "type": "null"
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-          ]
-        },
-        "retrieved_at": {
-          "type": "string"
-        },
-        "source": {
-          "type": "string"
-        },
-        "source_url": {
-          "type": "string"
-        }
-      },
-      "required": [
-        "source",
-        "source_url",
-        "data_vintage",
-        "retrieved_at",
-        "retrieval",
-        "citation",
-        "license"
-      ],
-      "type": "object"
-    },
-    "minItems": 1,
-    "type": "array"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "citation": {
+        "type": "string"
+      },
+      "data_vintage": {
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "derivation_note": {
+        "type": "string"
+      },
+      "derived": {
+        "type": "boolean"
+      },
+      "field_sources": {
+        "items": {
+          "additionalProperties": false,
+          "properties": {
+            "data_vintage": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "dataset_id": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "fields": {
+              "items": {
+                "type": "string"
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+              "minItems": 1,
+              "type": "array"
+            },
+            "retrieved_at": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "served_from_cache": {
+              "type": [
+                "boolean",
+                "null"
+              ]
+            },
+            "source_url": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "fields",
+            "source_url",
+            "dataset_id",
+            "data_vintage",
+            "retrieved_at"
+          ],
+          "type": "object"
+        },
+        "minItems": 1,
+        "type": "array"
+      },
+      "license": {
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "notices": {
+        "items": {
+          "type": "string"
+        },
+        "minItems": 1,
+        "type": "array"
+      },
+      "retrieval": {
+        "anyOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "anomalies": {
+                "items": {
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+                      "minimum": 1,
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+                  "type": "object"
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+              "attempts": {
+                "maximum": 9007199254740991,
+                "minimum": 1,
+                "type": "integer"
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+              "requests": {
+                "maximum": 9007199254740991,
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+                "type": "integer"
+              },
+              "unstable": {
+                "type": "boolean"
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+          {
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+        ]
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+      "retrieved_at": {
+        "type": "string"
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+      "revision": {
+        "additionalProperties": false,
+        "properties": {
+          "note": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
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+              "current",
+              "provisional",
+              "final"
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+        "type": "object"
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+      "source": {
+        "type": "string"
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+      "source_url": {
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+      }
+    },
+    "required": [
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+      "source_url",
+      "data_vintage",
+      "retrieved_at",
+      "retrieval",
+      "citation",
+      "license"
+    ],
+    "type": "object"
+  },
+  {
+    "items": {
+      "additionalProperties": false,
+      "properties": {
+        "citation": {
+          "type": "string"
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+        "data_vintage": {
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "derivation_note": {
+          "type": "string"
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+        "derived": {
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+        },
+        "field_sources": {
+          "items": {
+            "additionalProperties": false,
+            "properties": {
+              "data_vintage": {
+                "type": [
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+                  "null"
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+              "dataset_id": {
+                "type": [
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+                  "null"
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+              },
+              "fields": {
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+              "retrieved_at": {
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+              "served_from_cache": {
+                "type": [
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+                ]
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+          "minItems": 1,
+          "type": "array"
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+        "license": {
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "notices": {
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+          },
+          "minItems": 1,
+          "type": "array"
+        },
+        "retrieval": {
+          "anyOf": [
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+                        "minimum": 1,
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+                },
+                "unstable": {
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+            },
+            {
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+        "retrieved_at": {
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+        "revision": {
+          "additionalProperties": false,
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+            }
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+        "source": {
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+        },
+        "source_url": {
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+      },
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+        "retrieval",
+        "citation",
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+    "minItems": 1,
+    "type": "array"
+  }
+]

Changed3 schema fields changedv3.15.2Oct 7, 2026

addedOutput schema / properties / attribution

Added value: +{
+  "items": {
+    "type": "string"
+  },
+  "type": "array"
+}

addedOutput schema / properties / provenance

Added value: +{
+  "anyOf": [
+    {
+      "additionalProperties": false,
+      "properties": {
+        "citation": {
+          "type": "string"
+        },
+        "data_vintage": {
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "field_sources": {
+          "items": {
+            "additionalProperties": false,
+            "properties": {
+              "data_vintage": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "dataset_id": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "fields": {
+                "items": {
+                  "type": "string"
+                },
+                "minItems": 1,
+                "type": "array"
+              },
+              "retrieved_at": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "served_from_cache": {
+                "type": [
+                  "boolean",
+                  "null"
+                ]
+              },
+              "source_url": {
+                "type": "string"
+              }
+            },
+            "required": [
+              "fields",
+              "source_url",
+              "dataset_id",
+              "data_vintage",
+              "retrieved_at"
+            ],
+            "type": "object"
+          },
+          "minItems": 1,
+          "type": "array"
+        },
+        "license": {
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "retrieval": {
+          "anyOf": [
+            {
+              "additionalProperties": false,
+              "properties": {
+                "anomalies": {
+                  "items": {
+                    "additionalProperties": false,
+                    "properties": {
+                      "count": {
+                        "maximum": 9007199254740991,
+                        "minimum": 1,
+                        "type": "integer"
+                      },
+                      "kind": {
+                        "enum": [
+                          "timeout",
+                          "network",
+                          "http_4xx",
+                          "http_5xx",
+                          "rate_limited",
+                          "malformed_body"
+                        ],
+                        "type": "string"
+                      }
+                    },
+                    "required": [
+                      "kind",
+                      "count"
+                    ],
+                    "type": "object"
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+                  "type": "array"
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+                "attempts": {
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+                  "minimum": 1,
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+                "requests": {
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+      "required": [
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+        "source_url",
+        "data_vintage",
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+        "retrieval",
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+        "license"
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+      "type": "object"
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+    {
+      "items": {
+        "additionalProperties": false,
+        "properties": {
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+          "field_sources": {
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+              "additionalProperties": false,
+              "properties": {
+                "data_vintage": {
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+              "type": "object"
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+            "minItems": 1,
+            "type": "array"
+          },
+          "license": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "retrieval": {
+            "anyOf": [
+              {
+                "additionalProperties": false,
+                "properties": {
+                  "anomalies": {
+                    "items": {
+                      "additionalProperties": false,
+                      "properties": {
+                        "count": {
+                          "maximum": 9007199254740991,
+                          "minimum": 1,
+                          "type": "integer"
+                        },
+                        "kind": {
+                          "enum": [
+                            "timeout",
+                            "network",
+                            "http_4xx",
+                            "http_5xx",
+                            "rate_limited",
+                            "malformed_body"
+                          ],
+                          "type": "string"
+                        }
+                      },
+                      "required": [
+                        "kind",
+                        "count"
+                      ],
+                      "type": "object"
+                    },
+                    "type": "array"
+                  },
+                  "attempts": {
+                    "maximum": 9007199254740991,
+                    "minimum": 1,
+                    "type": "integer"
+                  },
+                  "requests": {
+                    "maximum": 9007199254740991,
+                    "minimum": 1,
+                    "type": "integer"
+                  },
+                  "unstable": {
+                    "type": "boolean"
+                  }
+                },
+                "required": [
+                  "requests",
+                  "attempts",
+                  "anomalies",
+                  "unstable"
+                ],
+                "type": "object"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "retrieved_at": {
+            "type": "string"
+          },
+          "source": {
+            "type": "string"
+          },
+          "source_url": {
+            "type": "string"
+          }
+        },
+        "required": [
+          "source",
+          "source_url",
+          "data_vintage",
+          "retrieved_at",
+          "retrieval",
+          "citation",
+          "license"
+        ],
+        "type": "object"
+      },
+      "minItems": 1,
+      "type": "array"
+    }
+  ]
+}

addedOutput schema / required

Added value: +[
+  "provenance",
+  "attribution"
+]

Changed3 schema fields changedv3.9.0Sep 24, 2026

changedInput schema / $schema

Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"

addedInput schema / additionalProperties
```
Added value: +false
```

changedOutput schema / $schema

Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"

Changed1 schema field changedv3.3.3Jul 6, 2026
- changedOutput schema / additionalProperties
```
Previous value: -trueNew value: +{}
```
First observedv3.3.1Jun 25, 2026

TDQS

A4.8/5.0

Behavior5/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already cover the safety profile (readOnly, idempotent, non-destructive), yet the description adds substantive behavioral context beyond them: the list is HISTORICAL, `dataDesligamento` non-null means the party already left, and without that filter a party appears to be in two blocos simultaneously. That anti-misinterpretation warning is exactly the kind of insight structured fields cannot carry.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Front-loaded with purpose and return shape, then the high-value historical-composition caveat, then routing to siblings. The parenthetical field enumerations are dense but each carries a real semantic payload; slightly long, but nothing is filler.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

An output schema exists, yet the description still earns its line by explaining the temporal semantics of `dataDesligamento` and repeated party entries — meaning the schema alone would not convey. For a no-param listing tool with full annotation coverage, nothing an agent needs to call or interpret it is missing.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The tool takes zero parameters, so there is nothing to disambiguate; baseline for a no-param tool applies. The description spends no wasted words on parameters and instead invests in output semantics.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

Opens with a specific verb+resource ('Lista todos os blocos parlamentares do Senado') and immediately scopes the payload to member parties. It clearly distinguishes itself from senado_obter_bloco (detail) and senado_liderancas (leaderships), so an agent can separate these three without opening any schema.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Explicitly states the workflow: use this to discover a bloco's `codigo`, then call `senado_obter_bloco` for details, and use `senado_liderancas` for leadership data. This is a named alternative plus the condition that selects it.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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