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 and current composition, to find a bloc code for detailed lookup.

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.

Input Schema

TableJSON Schema

Name	Required	Description	Default
No arguments

Output Schema

TableJSON Schema

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

Schema Changelog

Changes observed during successful MCP inspections.

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+          "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

A4.6/5.0

Behavior4/5

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

Annotations already cover the read-only/idempotent safety profile, but the description adds genuinely non-obvious behavioral context: the list is a HISTORICAL composition, a filled `dataDesligamento` means the party left, the current composition is the null entries, and the same party may repeat across distinct adhesion periods. This warns against a real misinterpretation (a party appearing in two blocos at once).

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?

Three sentences, front-loaded with scope and return shape, then the historical caveat, then the routing. Slightly long because return fields are enumerated despite an output schema existing, but every sentence carries information and none is wasted.

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?

For a zero-parameter list tool with an output schema and read-only annotations, the description supplies everything an agent needs: scope, the key semantic trap (historical vs current composition), and sibling routing. Nothing required for correct invocation 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 no parameters, so the baseline is 4; there is no parameter syntax to explain. The description correctly spends no space on inputs.

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 and resource ('Lista todos os blocos parlamentares do Senado e seus partidos membros') and enumerates the returned fields, so an agent knows exactly what it gets. It also distinguishes itself from siblings by naming what belongs elsewhere (leaderships via senado_liderancas).

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?

Explicit routing: use this to discover a bloco's `codigo` then detail it via `senado_obter_bloco`, and use `senado_liderancas` for leadership data. Both the when-to-use and the alternative for a different need are stated.

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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