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

With no annotations provided, the description carries the full behavioral burden and does disclose meaningful operational context: cost of 2 credits per page, the credits unit, and the required 'Authorization: Bearer <api_key>' header. It omits return shape and pagination mechanics, but the cost and auth disclosure is genuinely valuable.

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?

Front-loaded with the purpose, but the trailing metadata block ('Priced per page.. Platform=reddit resource=search. Costs 2 credit(s)...') is boilerplate-adjacent and contains a doubled period. Each fact is useful, yet the phrasing is clunky rather than tight.

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?

There is no output schema and no annotations, so the description must cover more. It handles purpose, cost, and auth, but says nothing about pagination behavior (despite the cursor parameter) or what a result page contains. Adequate but with clear gaps for a search 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 100%, so all four parameters (name, sort, cursor, period) are already documented with examples and defaults in the schema. The description adds no parameter-level meaning beyond that, so the baseline of 3 applies.

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 and resource: 'Search public Reddit posts by keyword.' An agent can distinguish it from reddit_comments and reddit_posts by resource scope. It does not explicitly name which sibling to prefer, so it stops short of a 5.

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 or when-not-to-use guidance. Given siblings like reddit_posts and reddit_comments, the description never explains when a keyword search is the right choice versus fetching a subreddit's posts or a post's comments. Usage is only implied by the verb 'Search'.

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