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montumodi

MongoDB Atlas MCP Server

by montumodi

cluster_test_primary_failover

Simulate a primary failover event to test cluster resilience and failover behavior.

Instructions

Initiate a test primary failover for the cluster

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
clusternameYesName of the cluster
optionsNoOptional parameters
Behavior2/5

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

With no annotations provided, the description carries full burden for behavioral disclosure. It only says 'test primary failover', implying it is non-destructive, but does not explicitly state whether it is reversible, requires permissions, or impacts production. This is insufficient for a potentially impactful operation.

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 concise sentence that front-loads the action. However, it is very brief and could be slightly more structured to include additional context.

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?

The tool performs a complex operation (primary failover test) with no output schema, yet the description does not explain what the outcome is, how to interpret results, or how it integrates with other cluster tools. This leaves significant gaps for an agent.

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 coverage is 100% with descriptions for both parameters (clustername and options). The description adds no extra meaning beyond what the schema provides, so baseline 3 is appropriate.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the action (initiate) and the resource (test primary failover on the cluster). It distinguishes this tool from sibling cluster tools as none of them mention failover, but it could be more specific about what the test entails.

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 like cluster_update or other cluster operations. There is no mention of prerequisites, context, or conditions for use.

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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