Senado BR — Brazilian Federal Senate Open Data

Detalhar matéria legislativa

senado_obter_materia

Read-onlyIdempotent

Fetch details, voting history, or documents for a Brazilian Senate legislative matter using its code; choose section for status, timeline, or texts.

Instructions

Obtém dados de uma matéria pelo codigoMateria, conforme secao (padrão detalhe): detalhe → objeto com identificacao, apelido, ementa, autor, situacao, localAtual, dataApresentacao, indexacao, classificacoes[], tramitando, relator (nome/partido/uf/comissão), deliberacao e normaGerada. tramitacao → histórico de tramitação cronológico em tramitacoes[] (data, local, descricao), com count/total (mantém os mais recentes ao truncar). textos → documentos da matéria em textos[] (tipo, formato, identificacao, data, autoria, url), do mais recente ao mais antigo. limite aplica-se a tramitacao/textos (padrão 100 e 50; ao truncar inclui aviso). Obtenha o codigoMateria via senado_buscar_materias.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`secao`	No	detalhe (situação/relator), tramitacao (histórico) ou textos (documentos)	detalhe
`limite`	No	Máximo de itens em tramitacao/textos (padrão: 100 tramitacao, 50 textos)
`codigoMateria`	Yes	Código único da matéria

Output Schema

TableJSON Schema

Name	Required	Description	Default
`provenance`	Yes
`attribution`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedv3.18.4Oct 14, 2026

changedOutput schema / properties / provenance / anyOf

Previous value: -[
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-            "type": "object"
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-                        "enum": [
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-  }
-]New value: +[
+  {
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+    "properties": {
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+      "data_vintage": {
+        "type": [
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+          "null"
+        ]
+      },
+      "derivation_note": {
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+      },
+      "derived": {
+        "type": "boolean"
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+      "field_sources": {
+        "items": {
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+          "properties": {
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+              "type": [
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+                "null"
+              ]
+            },
+            "source_url": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "fields",
+            "source_url",
+            "dataset_id",
+            "data_vintage",
+            "retrieved_at"
+          ],
+          "type": "object"
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+        "minItems": 1,
+        "type": "array"
+      },
+      "license": {
+        "type": [
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+          "null"
+        ]
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+      "notices": {
+        "items": {
+          "type": "string"
+        },
+        "minItems": 1,
+        "type": "array"
+      },
+      "retrieval": {
+        "anyOf": [
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+        "properties": {
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+              "final"
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+      "source": {
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+        "type": "string"
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+    "required": [
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+  {
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+        "citation": {
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+        "field_sources": {
+          "items": {
+            "additionalProperties": false,
+            "properties": {
+              "data_vintage": {
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+      },
+      "required": [
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+        "retrieved_at",
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+]

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": [
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+                  "null"
+                ]
+              },
+              "dataset_id": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "fields": {
+                "items": {
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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"
+          ]
+        },
+        "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"
+                        ],
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+                    "required": [
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+                "requests": {
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+                "unstable": {
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+              "required": [
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+                "anomalies",
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+        }
+      },
+      "required": [
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+        "data_vintage",
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+        "additionalProperties": false,
+        "properties": {
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+          "field_sources": {
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+              "additionalProperties": false,
+              "properties": {
+                "data_vintage": {
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+              "required": [
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+                "dataset_id",
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+                "retrieved_at"
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+            "type": "array"
+          },
+          "license": {
+            "type": [
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+              "null"
+            ]
+          },
+          "retrieval": {
+            "anyOf": [
+              {
+                "additionalProperties": false,
+                "properties": {
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+                      "properties": {
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+                          "maximum": 9007199254740991,
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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"
+    }
+  ]
+}

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"

Changed3 schema fields changedv3.3.3Jul 6, 2026
- removedInput schema / additionalProperties
```
Removed value: -false
```
- addedInput schema / properties / codigoMateria / maximum
```
Added value: +9007199254740991
```
- changedOutput schema / additionalProperties
```
Previous value: -trueNew value: +{}
```
First observedv3.3.1Jun 25, 2026

TDQS

A4.4/5.0

Behavior4/5

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

Annotations already declare this a safe, idempotent, open-world read, so the bar is lower. The description adds real behavioral context beyond that: truncation keeps the most recent items, an 'aviso' is included when truncated, and textos are returned most-recent-first.

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, then a dense enumeration of section behaviors. It is long but nearly every clause carries information an agent needs; structure is a single paragraph rather than cleanly separated, which slightly hurts scannability.

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?

Given an output schema exists and annotations cover the safety profile, the description supplies everything else an agent needs: section semantics, field inventories, defaults, truncation behavior, ordering, and the prerequisite lookup step. Nothing material 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?

Schema coverage is 100%, so baseline is 3, but the description goes further by expanding what each secao enum value returns (distinct field sets for detalhe/tramitacao/textos). This meaningfully exceeds the schema's terse enum gloss and limit note.

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?

States a specific verb ('Obtém dados de uma matéria') and resource, and immediately differentiates itself from siblings by routing to senado_buscar_materias for the required codigoMateria. An agent can tell what this tool fetches and how it relates to the search tool 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 Guidelines4/5

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

Explicitly names the alternative tool and the condition for using it ('Obtenha o codigoMateria via senado_buscar_materias'), establishing a clear two-step workflow. It also implies usage via the secao breakdown, but gives no explicit when-not-to-use guidance.

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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