Senado BR — Brazilian Federal Senate Open Data

Votações de um senador

senado_votacoes_senador

Read-onlyIdempotent

Retrieve a Brazilian senator's recorded votes by senator code, year, or date range, showing each matter, vote, and result in reverse chronological order.

Instructions

Lista as votações nominais de um senador, mostrando como votou em cada matéria. Retorna { periodo, count, votos }, cada voto com codigoSessao, codigoVotacao, data, materia, descricao, voto e resultado, ordenados da mais recente para a mais antiga. Sem período usa o ano corrente; informe ano ou o par dataInicio/dataFim (YYYYMMDD). Requer codigoSenador (obtenha via senado_listar_senadores); para detalhes de uma votação específica (votos de todos os senadores) use senado_obter_votacao — os dois códigos são aceitos, e codigoSessao resolve direto.

Input Schema

TableJSON Schema

Name	Required	Description
`ano`	No	Ano das votações
`dataFim`	No	Data fim (YYYYMMDD)
`dataInicio`	No	Data início (YYYYMMDD)
`codigoSenador`	Yes	Código único do senador

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

Added value: +{
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addedOutput schema / properties / provenance

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+          }
+        },
+        "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 / codigoSenador / maximum
```
Added value: +9007199254740991
```
- changedOutput schema / additionalProperties
```
Previous value: -trueNew value: +{}
```
First observedv3.3.1Jun 25, 2026

TDQS

A4.6/5.0

Behavior4/5

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

Annotations already declare readOnly, idempotent and non-destructive, so safety is covered. The description adds genuine behavioral context beyond that: default is the current year when no period is given, and results are ordered most-recent-first. It stops short of discussing rate limits or truncation, but the added value is real.

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?

Purpose and return shape are front-loaded, followed by period behavior, the required parameter, and the sibling alternative. Dense but each sentence carries usable information; only the full field-by-field return enumeration is slightly redundant given an output schema exists.

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 a 4-parameter tool with an output schema and strong annotations, the description covers defaults, parameter interaction, the required identifier's provenance, and the routing alternative. Nothing an agent needs to invoke it correctly 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 the baseline is 3. The description goes beyond the schema by explaining the relationship between the parameters — use ano OR the dataInicio/dataFim pair — and the YYYYMMDD format, plus the accepted session/votation codes, which the flat schema does not make explicit.

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 (Lista) and resource (votações nominais de um senador) with clear scope: it shows how the senator voted on each matéria. It also explicitly distinguishes itself from the sibling senado_obter_votacao, so an agent can route without opening either 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?

Names the alternative explicitly (senado_obter_votacao for all senators' votes on one votação) and the condition that selects it. It also tells the agent how to obtain the required codigoSenador via senado_listar_senadores, and defines the default period behavior.

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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