pinecone_describe_index_stats

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

No annotations are provided, so the description carries the full behavioral burden. It doesn't state that this is a read-only operation, whether it requires specific permissions, or whether the count is eventually consistent. For a stats tool with zero annotation coverage, this is thin.

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?

A single eleven-word sentence with no waste, front-loaded with the returned data. Efficient, though a bit terse for a stats tool that could explain scoping.

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?

An output schema exists, so return values needn't be explained. However, with no annotations, no output schema info in the description, and 0% schema param coverage, the definition leaves gaps for a mutation-adjacent (non-readOnly-declared) tool.

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?

Schema description coverage is 0%, so the description should explain the parameters. It mentions per-namespace breakdown, which loosely implies the optional namespace scoping, but doesn't clarify required vs optional or the default behavior. Partial compensation only.

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?

States a specific resource (index stats) and enumerates the retrieved data (record counts, dimension, per-namespace breakdown). Distinguishable from pinecone_describe_index (configuration) and pinecone_describe_namespace, though neither sibling is explicitly named.

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?

No when-to-use context, no prerequisite guidance, and no mention of the adjacent describe_index/pinecone_describe_namespace tools. The agent must infer usage from the description alone.

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