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giovanemartins

LocalStack MCP Server

eventbridge_put_events

Send custom events to an EventBridge event bus in LocalStack to test event-driven applications locally.

Instructions

Put custom events onto an EventBridge event bus in LocalStack

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
entriesYesEvents to put (max 10)
Behavior2/5

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

No annotations are provided, and the description only states the action. It does not disclose behavioral traits such as whether events are validated, any limitations of the LocalStack environment, or partial failure behavior. This leaves the agent without crucial operational context.

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?

The description is a single concise sentence that is front-loaded and avoids unnecessary words. It earns its place with no fluff.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

While the schema is rich, the description is very thin for a write operation. There is no output schema, and the tool's behavior in LocalStack is not explained. The agent cannot infer what the tool returns or any edge cases.

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?

The schema description coverage is 100% for all properties, including 'entries', 'detail', 'source', etc. The description adds no extra parameter details, but the baseline is 3 given the schema already documents everything.

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 uses a specific verb 'Put' and clearly identifies the resource: 'custom events onto an EventBridge event bus in LocalStack'. It distinguishes from siblings like 'eventbridge_put_rule' and 'eventbridge_put_targets' which target different entities.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides no guidance on when to use this tool vs alternatives such as 'sns_publish' or 'kinesis_put_record'. It simply states the action without exclusions or alternative recommendations.

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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