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dipankarmazumdar

iceberg-mcp-server-trino

query_metadata_table

Query Iceberg metadata tables with a configurable row limit and optional column selection for safe data exploration.

Instructions

Query an Iceberg metadata table with a safe row limit. Optional comma-separated columns.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
limitNo
tableYes
columnsNo
metadata_nameYes

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 carries the full burden. It indicates safety via 'safe row limit', but lacks details on permissions, state changes, or error handling. The behavioral profile is only partially disclosed.

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 extremely concise with two sentences that front-load the core purpose and key parameters. Every word earns its place with no redundancy.

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 complexity of 4 parameters, an output schema (unmentioned), and 16 sibling tools, the description is too brief. It lacks context on metadata name semantics, output structure, and relation to other tools.

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 0%, so the description must compensate. It adds meaning for 'limit' (safe row limit) and 'columns' (comma-separated), but leaves 'table' and 'metadata_name' unexplained. The description is insufficient for all 4 parameters.

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 queries an Iceberg metadata table, specifying a safe row limit and optional column selection. However, it does not explicitly distinguish from the sibling tool 'describe_metadata_table', which might be confused with this querying function.

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 over alternatives like 'execute_query' or 'describe_metadata_table'. The description mentions a 'safe row limit' but does not elaborate on use cases or limitations.

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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