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local_marketplace_index
Destructive

Scan a local directory of packages and generate an index of installable tdmcp packages.

Instructions

Scan a local package directory and write an index of installable tdmcp packages.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
package_dirYes
out_fileNo
Behavior3/5

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

Annotations already indicate destructiveness (writes) and openness. The description adds that it writes an index to a file, but lacks details on overwrite behavior, file format, or permissions. With annotations present, the description provides minimal additional behavioral context.

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, very concise and front-loaded. It wastes no words but could be slightly expanded 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 the tool's simplicity (2 params, no output schema), the description is incomplete. It does not explain the index format, what happens if out_file is omitted, or any side effects on existing files. Annotations provide some context but the description leaves gaps.

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 coverage is 0%, so the description must compensate. It mentions 'package directory' and 'index', giving context for package_dir and out_file, but does not explicitly link parameters to their roles or clarify out_file's optional behavior. Insufficient compensation for low coverage.

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 tool scans a local directory and writes an index of packages. It uses specific verbs and resources, distinguishing it from sibling tools like 'install_library_package' or 'browse_library'.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description implies usage for scanning and indexing local packages but provides no explicit guidance on when to use this tool versus alternatives like 'generate_library_index'. No when-not or contextual exclusions are given.

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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