Senado BR — Brazilian Federal Senate Open Data

Lideranças partidárias

senado_liderancas

Read-onlyIdempotent

List leadership roles in Brazil's Senate, Chamber of Deputies, and National Congress—leaders, vice-leaders—and filter by house, parliamentarian, current status, or leadership type.

Instructions

Lista as lideranças do Senado, da Câmara e do Congresso Nacional (líderes, vice-líderes etc.). Retorna { count, liderancas }, cada item com tipo, descricao, unidadeLideranca, casa, dataDesignacao, dataTermino, numeroOrdemViceLider, bloco (codigo/nome/sigla — preenchido quando a liderança é de bloco; o codigo serve em senado_obter_bloco), partido (codigo/sigla/nome — a unidade liderada, quando liderança de partido) e parlamentar (codigo, nome, partido de filiação, uf). A fonte NÃO publica a UF do parlamentar (vem sempre null) — obtenha-a via senado_obter_senador pelo codigo. Filtre por casa (SF/CN/CD), codigoParlamentar, vigente (S/N) ou siglaTipoLideranca; sem filtros retorna todas as casas. Para a composição de blocos use senado_listar_blocos.

Input Schema

TableJSON Schema

Name	Required	Description
`casa`	No	Casa legislativa (SF=Senado, CN=Congresso, CD=Câmara dos Deputados)
`vigente`	No	Apenas vigentes (S/N)
`codigoParlamentar`	No	Código do parlamentar
`siglaTipoLideranca`	No	Tipo de liderança (ex: LIDER, VICE-LIDER)

Output Schema

TableJSON Schema

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

Schema Changelog

Changes observed during successful MCP inspections.

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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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+                  "unstable"
+                ],
+                "type": "object"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "retrieved_at": {
+            "type": "string"
+          },
+          "source": {
+            "type": "string"
+          },
+          "source_url": {
+            "type": "string"
+          }
+        },
+        "required": [
+          "source",
+          "source_url",
+          "data_vintage",
+          "retrieved_at",
+          "retrieval",
+          "citation",
+          "license"
+        ],
+        "type": "object"
+      },
+      "minItems": 1,
+      "type": "array"
+    }
+  ]
+}

addedOutput schema / required

Added value: +[
+  "provenance",
+  "attribution"
+]

Changed4 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
```

changedInput schema / properties / casa / description

Previous value: -"Casa legislativa (SF=Senado, CN=Congresso)"New value: +"Casa legislativa (SF=Senado, CN=Congresso, CD=Câmara dos Deputados)"

changedOutput schema / $schema

Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"

Changed4 schema fields changedv3.3.3Jul 6, 2026
- removedInput schema / additionalProperties
```
Removed value: -false
```
- addedInput schema / properties / codigoParlamentar / maximum
```
Added value: +9007199254740991
```
- addedInput schema / properties / codigoParlamentar / minimum
```
Added value: +-9007199254740991
```
- changedOutput schema / additionalProperties
```
Previous value: -trueNew value: +{}
```
First observedv3.3.1Jun 25, 2026

TDQS

A4.3/5.0

Behavior4/5

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

Annotations already declare readOnlyHint, idempotentHint, non-destructive and openWorld, so safety is covered. The description still adds real behavioral context beyond the annotations: the source never publishes UF (always null) and it must be resolved via senado_obter_senador, and it explains that bloco/partido fields are conditionally populated. It stops short of describing pagination or rate behavior.

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

Conciseness3/5

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

Purpose is front-loaded in the first clause, which is good, but the bulk of the paragraph enumerates return-object fields (tipo, descricao, unidadeLideranca, casa, dataDesignacao…) that a dedicated output schema already covers. Given the output schema exists, this is duplicated content and dilutes the signal.

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?

Covers scope, filter semantics, defaults, conditional field population, a known data quirk (null UF) with its workaround, and cross-references to senado_obter_bloco and senado_listar_blocos. An agent has everything needed to call and interpret the tool correctly.

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, but the description goes further by explaining the default when no filters are passed and by tying codigoParlamentar and bloco.codigo to the tools that consume them. It adds cross-parameter meaning rather than merely restating the schema.

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 ("lideranças do Senado, da Câmara e do Congresso Nacional") and immediately clarifies the entity scope with examples (líderes, vice-líderes). No sibling tool covers this resource, so the agent can identify it unambiguously.

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?

Gives concrete filtering guidance (casa, codigoParlamentar, vigente, siglaTipoLideranca) and an explicit default ("sem filtros retorna todas as casas"), plus routing to senado_obter_senador and senado_listar_blocos for downstream needs. It doesn't state when NOT to use it, but no competing sibling exists, so the guidance is essentially complete.

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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