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ys1173

duckdb-iceberg-mcp

by ys1173

list_tables

List available Apache Iceberg tables from the AWS Glue Data Catalog, with optional filtering by database name.

Instructions

List available tables. Optionally filter by database name.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
databaseNo

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior3/5

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

No annotations are provided, so the description carries the full burden. It states the main action and filtering option but does not disclose any behavioral traits such as permissions, performance implications, or edge cases (e.g., empty result). It is minimally adequate for a simple listing tool.

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 a single sentence that front-loads the main action. Every word earns its place, with no superfluous text.

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

Completeness4/5

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

Given the simplicity (1 optional param, output schema exists), the description is fairly complete. It covers the core functionality and filtering. However, it could clarify the scope of 'tables' (e.g., database tables versus other entities) to enhance completeness.

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?

The schema coverage is 0%, so the description must add meaning. It explains that the 'database' parameter is optional and filters results, which adds value beyond the schema. However, it does not specify the expected format or behavior when the parameter is empty.

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 clearly states the action ('List available tables') and resource, and mentions optional filtering. It is distinct from sibling tools like describe_table and query_lakehouse.

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 describe_table or query_lakehouse. Implicit usage context is minimal.

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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