Senado BR — Brazilian Federal Senate Open Data

Listar comissões

senado_listar_comissoes

Read-onlyIdempotent

List active Brazilian Senate committees, filter by type (permanent, temporary, CPI, mixed), and get acronyms needed for detailed committee queries.

Instructions

Lista comissões (colegiados) ativas do Senado, com filtros por tipo (permanente, temporaria, cpi, mista) e ativa. Retorna { count, comissoes }, cada item com codigo, sigla, nome, tipo, casa e ativa. O endpoint só traz comissões ativas, logo ativa=false resulta em lista vazia. Use para descobrir a sigla exigida por senado_obter_comissao e senado_reunioes_comissao.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`tipo`	No	Tipo: permanente, temporaria, cpi, mista
`ativa`	No	Apenas comissões ativas

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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+      },
+      "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"

Changed2 schema fields changedv3.3.3Jul 6, 2026
- removedInput schema / additionalProperties
```
Removed value: -false
```
- 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 cover readOnly/idempotent/openWorld, so the safety profile is handled. The description adds genuine behavior beyond that: the source only contains active committees, so ativa=false returns an empty list, and it enumerates the return shape. It stops short of noting pagination or result-size limits.

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 return shape, the ativa caveat, and the usage pointer — all in four dense sentences. The return-shape sentence partially duplicates the available output schema, making it slightly redundant rather than wasteful.

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 and annotations carry the safety profile, so the description only needed to add the domain-specific gotcha and the routing hint — both present. Nothing an agent needs to call this correctly is missing.

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

Parameters3/5

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

Schema description coverage is 100% and includes the enum values for tipo, so the schema already documents both parameters. The description mirrors those values and adds the ativa=false empty-result consequence, but adds little else beyond what the schema states.

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 comissões ativas do Senado') and scopes it with the two filter dimensions. It distinguishes itself from committee-related siblings by naming senado_obter_comissao and senado_reunioes_comissao as the consumers of the returned sigla.

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 says when to use it: to discover the sigla required by senado_obter_comissao and senado_reunioes_comissao, routing the agent to the right tools. It also flags a real trap — the endpoint only returns active committees, so ativa=false yields an empty list.

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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