ls_list_projects

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

There are no annotations, so the description carries the burden. It states the return type (list of project objects) and mentions optional statistics, which is useful. However, it doesn't disclose any side effects (likely read-only, but not stated), pagination behavior (only a limit, no offset), or how the default limit works in practice (e.g., whether it returns up to 10 or exactly 10). This is adequate but could be more explicit about being a read-only operation and any server-side defaults.

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?

The description is very concise: a single sentence followed by an Args/Returns structure that is front-loaded and scannable. Every part earns its place: it covers purpose, the one parameter, and the return shape. No fluff or repetition.

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?

With only one parameter, an output schema (though its richness isn't shown, it's present), and no annotations, the description covers the essentials: what it lists, the limit semantics, and the return type. It doesn't discuss error handling, authentication, or retries, but for a simple listing tool with a single optional parameter, this is reasonably complete. Sibling tools exist, but the description's scoping to projects is sufficient for basic selection. A 4 is warranted given the tool's simplicity.

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 only one parameter (limit) with a default, but the schema_description_coverage is 0% (no description beside the property). The description compensates by explaining the limit's default and range (1-200), which adds meaning beyond the bare schema. However, it doesn't mention whether limit is optional (though it has a default, implying so) or how it interacts with pagination. This is acceptable for a single simple parameter, so a 3 is appropriate.

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 clearly states it lists projects from LangSmith workspace, with a specific verb ('List') and resource ('projects'). It doesn't explicitly distinguish from sibling tools like ls_list_runs, but the resource name is different enough to avoid confusion, and it mentions the workspace context.

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?

The description implies usage for listing projects, but provides no guidance on when to use this vs. alternatives like ls_list_runs or ls_list_children. It does document the limit parameter's default and range, which gives some context, but lacks explicit exclusions or alternative recommendations.

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