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PaulMRamirez

Yamcs MCP Server

by PaulMRamirez

storage_objects

List objects in a Yamcs bucket, filtered by optional prefix and limited to specified count.

Instructions

List objects in a bucket.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
limitNoMaximum number of objects to return (default: 100)
bucketYesBucket name
prefixNoObject prefix filter
instanceNoYamcs instance (uses default if not specified)

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Behavior2/5

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

With no annotations, the description only states the action but omits behavioral traits such as that it returns a list, uses default instance, or that the limit parameter may cause pagination. No details on whether listing is recursive or requires specific permissions.

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?

Single sentence, no unnecessary words. Front-loaded and efficient.

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

Completeness3/5

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

Despite good schema coverage and existence of an output schema, the description lacks context about behavior (e.g., pagination, default instance usage) and does not explain how results are returned, making it minimally complete for a 4-parameter tool with no annotations.

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?

All 4 parameters are fully described in the input schema, so the description adds no additional meaning beyond what the schema already provides. Baseline 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 'List objects in a bucket' uses a specific verb and resource, clearly distinguishing from sibling tools like storage_buckets (list buckets) and storage_delete_object (delete objects).

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 on when to use this tool versus alternatives like storage_get_object_info for individual objects. Does not mention filtering options or pagination behavior.

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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