Senado BR — Brazilian Federal Senate Open Data

Votos de uma matéria

senado_votos_materia

Read-onlyIdempotent

Retrieve all vote sessions and tallies for a Brazilian Senate bill using its codigoMateria, optionally including each senator's nominal vote.

Instructions

Obtém as votações de uma matéria pelo codigoMateria. Retorna { codigoMateria, count, votacoes }, cada item com data, descricao, resultado e placar (totalSim/totalNao/totalAbstencao); com incluirVotos: true (padrão false) acrescenta votos[] (nome, partido, uf e voto de cada senador). Obtenha o codigoMateria via senado_buscar_materias ou senado_obter_materia.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`incluirVotos`	No	Incluir votos nominais de cada senador
`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

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Changed3 schema fields changedv3.15.2Oct 7, 2026

addedOutput schema / properties / attribution

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addedOutput schema / properties / provenance

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+        ],
+        "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

A4.5/5.0

Behavior4/5

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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint, and destructiveHint=false. The description adds valuable behavior beyond annotations: it explains the returned object shape and that incluirVotos=true (default false) expands each votação with nominal senator votes. It does not contradict annotations and adds meaningful conditional-output detail.

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

Conciseness5/5

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

Three front-loaded sentences: purpose first, then return shape, then the optional flag's effect, then the input-source hint. Every sentence earns its place, and there is no filler or repetition. The structure is efficient and easy for an agent to scan.

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?

Even though an output schema exists, the description sufficiently covers purpose, required input sourcing, optional data expansion, and return shape. Annotations cover the safety profile, and no critical behavior for calling the tool is missing. It is complete for a read-only, two-parameter lookup tool.

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 description coverage is 100%, so the baseline is 3. The description adds meaning beyond the schema by specifying that codigoMateria can be sourced from two named sibling tools and that incluirVotos=true adds votos[] with senator name, party, state, and vote. This clarifies parameter impact without repeating the schema verbatim.

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?

The description states a specific verb and resource: 'Obtém as votações de uma matéria pelo codigoMateria.' It distinguishes itself from sibling tools by scoping to votings tied to a single matter, rather than a single votação or a general search. An agent can tell what it returns without opening the 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?

It gives clear prerequisite context: the required codigoMateria must be obtained via senado_buscar_materias or senado_obter_materia. However, it does not explicitly state when to choose this tool over alternatives like senado_obter_votacao or senado_search_votacoes. The guidance is useful but lacks the when-not/alternative-selection detail needed for a 5.

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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