get_repo_overview

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

With no annotations, the description carries the full burden. It discloses the read-only nature by saying 'Return' and describes the output shape, but it does not mention potential prerequisites, performance implications, or what happens when repo_root is null. This is adequate but incomplete.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

Two tight sentences with no filler. The first sentence front-loads the core behavior and output content; the second gives the usage context. Every word earns its place.

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

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

For a simple read-only tool with one optional parameter and no output schema, the description covers the main purpose and output well. However, the undefined parameter behavior and the relationship to index_repository leave enough ambiguity that an agent may not know how to invoke it correctly on first use.

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

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

The schema has 0% description coverage for repo_root, and the tool description does not mention the parameter at all. The agent is left to infer that repo_root is the repository path and that null may mean the current directory, which the description does not clarify.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description states exactly what the tool returns: a high-level architecture summary with top-level directories, language breakdown, and files with the most symbols. This clearly distinguishes it from sibling file-level tools like get_file_summary and search_code.

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

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

It explicitly says to use this to 'orient before drilling into specific files,' which gives a clear when-to-use context. It does not name alternatives or state when not to use it, but the orientation purpose is specific enough.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.