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mahigadamsetty

pyroscope-mcp

pyroscope_label_names

Retrieve available label names from Grafana Pyroscope using the Connect API, optionally filtered by time range and matchers.

Instructions

List available label names via Connect API.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
endNoEnd timestamp in milliseconds since epoch.
startNoStart timestamp in milliseconds since epoch.
baseUrlNo
matchersNoOptional label selectors.
tenantIdNo
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 implies a read operation ('List') but lacks details on authentication needs, rate limits, or whether the operation is safe. The phrase 'via Connect API' is vague.

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 include a bit more context without losing conciseness.

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 5 parameters, no annotations, and no output schema, the description is insufficient. It does not explain the return format, how parameters filter results, or how this tool relates to its siblings (e.g., pyroscope_label_values).

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters2/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 60% (3 out of 5 parameters have descriptions). The tool description adds no extra meaning to the parameters; it does not explain how 'start', 'end', or 'matchers' affect the label names returned. Parameters 'baseUrl' and 'tenantId' lack descriptions both in schema and tool description.

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 verb 'List', resource 'label names', and method 'Connect API'. It distinguishes from siblings like 'pyroscope_label_values' (which lists values for a given label) but does not explicitly contrast them.

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 (e.g., pyroscope_label_values or pyroscope_series). The agent receives no context about prerequisites or typical use cases.

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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