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

With no annotations, the description carries the full burden and does well: it discloses the result cap (100), the default page size (20), the billing model (per 10 results), and that failed calls and empty pages are free. It omits auth requirements, rate limits, and what the returned result fields look like, but the cost/limit disclosure is genuinely useful context beyond the schema.

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?

Three short sentences, front-loaded with purpose then limits then cost. Every sentence earns its place, especially the billing note which materially affects how an agent should size limit.

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 no output schema, the description appropriately covers result count and default page size. It is nearly complete for a search tool, with the only gap being the meaning of the sort and timeRange enum options.

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 coverage is 57%, and the description adds a real detail not in the schema: limit defaults to 20. It also clarifies that 'community' scopes to one subreddit. However, sort and timeRange have no descriptions in either place, and cursor/includeComments semantics are left to the schema.

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 verb (search) and resource (Reddit posts) plus scope (site-wide or one subreddit). It is clear enough to distinguish from reddit_feed and reddit_read by implication, but never names or contrasts them explicitly.

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?

Usage is implied by the scope phrase 'across Reddit or inside one subreddit,' which tells the agent community is optional. There is no explicit when-to-use guidance versus the sibling feed/read tools, and no stated prerequisites or exclusions.

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