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LocalStack MCP Server

LocalStack MCP Server

by giovanemartins
OverviewSchemaSourceRelated ServersDiscussionsAdmin
TypeScript
Local

eventbridge_enable_rule

Enable an EventBridge rule in LocalStack to activate event routing for local AWS development and testing.

Instructions

Enable an EventBridge rule in LocalStack

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "name": "<name>"
    },
    "name": "eventbridge_enable_rule"
  }
}

Input Schema

NameRequiredDescriptionDefault
nameYesRule name
eventBusNameNoEvent bus name (default: default)

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

B3.1/5.0
Behavior2/5

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

With no annotations, the description carries the full burden. It states that the tool 'enables' a rule, implying a state change, but provides no details about side effects, idempotency, permission requirements, or error conditions. This is minimal and lacks context beyond the verb itself.

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?

The description is a single, clear, front-loaded sentence with no wasted words. However, it is so brief that it omits valuable context, which slightly detracts from its conciseness effectiveness; it is concise but under-specified.

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?

Although the tool is simple (2 parameters, no nested objects, no output schema), the description lacks important context: what happens on success, whether the rule must already exist, how it interacts with disable_rule, and any behavioral notes. With no annotations, the description is insufficient for an agent to fully understand the tool's effects.

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 input schema covers both parameters with descriptions (100% coverage), so the description does not need to add parameter details. However, it adds no extra meaning beyond the schema, so the baseline of 3 is appropriate.

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 ('Enable') and resource ('EventBridge rule') and clearly differentiates from siblings such as disable_rule and put_rule. The 'in LocalStack' context clarifies the environment, though it is redundant with the tool name.

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?

No guidance is provided on when to use this tool versus alternatives. It does not mention prerequisites (e.g., rule must exist) or contrast with eventbridge_disable_rule or eventbridge_put_rule. The intended use is implied by the name and description but not explicit.

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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