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PaulMRamirez

Yamcs MCP Server

by PaulMRamirez

alarms_read_log

Read alarm history from the Yamcs archive with optional filters for name, time range, sorting, and maximum number of results.

Instructions

Read alarm history from the archive.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
nameNoOptional alarm name filter
stopNoStop time (ISO 8601 format or 'now', 'today', 'yesterday')
linesNoMaximum number of alarms to return (default: 10)
startNoStart time (ISO 8601 format or 'now', 'today', 'yesterday')
instanceNoYamcs instance (uses default if not specified)
descendingNoSort order, True for most recent first (default: True)

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 bears full responsibility for behavioral disclosure. It only says 'read alarm history', omitting details like filtering, sorting, pagination, or that it is a read-only operation. This is insufficient for safe agent invocation.

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 sentence with no wasted words. However, it could be structured to front-load key details like filtering capabilities. Still, it is efficient.

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?

Given the tool has 6 parameters and an output schema, the description is too brief. It does not explain the archive nature, filtering options, or return behavior, leaving the agent to infer from schema alone.

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 clear parameter descriptions (name, start, stop, lines, descending, instance). The tool description adds no additional information beyond the schema, 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 states the verb 'read' and resource 'alarm history from the archive', clearly indicating what the tool does. It distinguishes from siblings like 'alarms_list_alarms' which likely deals with current alarms, but does not explicitly differentiate.

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 such as 'alarms_list_alarms' or 'alarms_describe_alarm'. The description lacks context about selecting this tool for historical data vs. current state.

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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