Senado BR — Brazilian Federal Senate Open Data

Mesa Diretora

senado_mesa

Read-onlyIdempotent

List Brazil's Senate or National Congress presiding board members—president, vice-presidents, secretaries—with role, party, and state.

Instructions

Lista os membros da Mesa Diretora (presidente, vice-presidentes, secretários). O parâmetro casa (padrão senado) escolhe entre senado (Mesa do Senado Federal) e congresso (Mesa do Congresso Nacional). Retorna { casa, mesa, count, membros }, cada membro com cargo, codigo, nome, partido e uf. Para lideranças partidárias use senado_liderancas.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`casa`	No	senado (Mesa do SF) ou congresso (Mesa do CN)	senado

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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+}

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 declare readOnlyHint, idempotentHint, openWorldHint and destructiveHint=false, so safety is covered. The description adds the default value behavior of `casa` and the shape/content of the response, which is useful operational context beyond the annotations.

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?

Four compact sentences, front-loaded with purpose and scope, with the sibling redirect at the end. The return-shape sentence is slightly redundant given an output schema exists, but nothing 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 single-optional-param list tool with an output schema and full annotations, the description covers purpose, parameter meaning, default, response contents and the nearest sibling. Nothing needed to call 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% with an enum, so the baseline is 3. The description expands the enum meaning ("Mesa do Senado Federal" vs "Mesa do Congresso Nacional") and states the default explicitly, adding modest meaning beyond the terse schema text.

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 names a specific verb ("Lista") and resource ("membros da Mesa Diretora") and enumerates the roles covered (presidente, vice-presidentes, secretários). It explicitly distinguishes itself from the sibling tool senado_liderancas, so an agent can route without inspecting schemas.

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 an explicit alternative and the condition for it: "Para lideranças partidárias use senado_liderancas." That is clear routing guidance, though it covers only one exclusion rather than a full when-to-use/when-not-to-use map.

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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