Senado BR — Brazilian Federal Senate Open Data

Licitações do Senado

senado_licitacoes

Read-onlyIdempotent

Search Brazilian Federal Senate procurement bids by exact number or object text to retrieve matching raw tender records for contract research.

Instructions

Busca licitações do Senado por número exato (ex: 19/2018) ou texto do objeto. Retorna { count, total, licitacoes } com os registros brutos da API administrativa, limitados a limite (padrão 50, máx 500). Exige ao menos numero ou objeto (sem filtro retorna erro). Para o contrato resultante de uma licitação, use senado_contratos.

Input Schema

TableJSON Schema

Name	Required	Description
`limite`	No	Máximo de resultados (padrão: 50)
`numero`	No	Número exato da licitação (ex: 19/2018)
`objeto`	No	Texto no objeto da licitação

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

Added value: +{
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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

A4.5/5.0

Behavior4/5

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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint, so the safety profile is covered. The description usefully adds that results are raw administrative-API records, are capped by limite, and that a filterless call errors out. It stops short of describing pagination/offset behavior or result ordering.

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

Conciseness5/5

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

Three sentences, zero filler: query modes first, return shape second, precondition third, alternative tool last. The response contract is front-loaded where an agent will see it immediately.

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?

Return shape is stated inline even though an output schema exists, the required-filter constraint is explicit, the result cap is bounded, and the adjacent-tool relationship is documented. Nothing needed to invoke 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%, so the schema already documents all three parameters including the exact-number semantics of numero and the limite default. The description restates these (limite default 50 / max 500, numero format example) without adding matching or normalization rules the schema omits, so baseline 3 applies.

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 ('Busca licitações do Senado') and immediately narrows the query modes to exact number or object text. It also names the sibling senado_contratos as the destination for related data, so an agent can place it in the tool family without reading any 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?

Explicit routing: 'Para o contrato resultante de uma licitação, use senado_contratos' tells the agent which alternative to pick and under what condition. It further states a hard precondition ('Exige ao menos numero ou objeto (sem filtro retorna erro)'), removing the main way an agent would misuse it.

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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