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GreptimeDB MCP Server

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by GreptimeTeam

query_range

Execute time-window aggregation queries on GreptimeDB by specifying table, select fields, and alignment. Supports grouping, filtering, and fill options for missing data.

Instructions

Execute time-window aggregation query using GreptimeDB's RANGE query syntax.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
tableYes
selectYes
alignYes
byNo
whereNo
fillNo
order_byNo
formatNojson
limitNo

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior2/5

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

With no annotations, the description should disclose behavioral traits like idempotency or side effects. It only describes the action without mentioning any constraints or implications.

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?

The description is a single, concise sentence with no unnecessary words or information.

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

Completeness1/5

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

Given the tool has 9 parameters, no schema descriptions, and no annotations, the single-sentence description is severely lacking. The output schema exists but is not utilized in the description.

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

Parameters1/5

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

Schema coverage is 0% and the description adds no details about any of the 9 parameters, leaving the agent entirely dependent on parameter names.

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 tool executes time-window aggregation queries using GreptimeDB's RANGE syntax, which is specific. However, it does not differentiate from sibling tools like execute_sql or execute_tql that might also handle queries.

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, nor are there any conditions or prerequisites mentioned.

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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