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

Annotations already declare readOnlyHint=true, destructiveHint=false, idempotentHint=true, and openWorldHint=true, covering safety and side-effect transparency. The description adds concrete behavioral details about the return fields (addresses, topics, subscriber counts, message counts, price-per-KB) and the search/sort behavior, which is useful beyond the annotations. No contradiction.

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 a single, well-structured sentence that front-loads the core action and includes essential return information. Every word earns its place, with no redundancy or fluff. It is appropriately sized for a simple search tool.

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?

Given the tool's simplicity (3 optional params, no required args, no nested objects) and the presence of an output schema (as per context signals), the description fully covers what the agent needs: what it searches, how results are ordered, and what fields are returned. The annotations and schema handle the rest. This is complete 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 coverage is 100%: all three parameters (limit, query, sortBy) have descriptions in the schema. The description adds no extra parameter meaning beyond what the schema already provides. The mention of 'topic' and 'sort order' mirrors the schema fields, so the baseline score 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?

The description specifies the exact action ('Search PayPerByte publishers') and scope ('by topic and sort order'), clearly distinguishing it from siblings like byte_get_publisher (likely single publisher lookup) and byte_list_feeds (listing feeds). The verb 'Search' plus the explicit resource and modifiers makes the purpose unambiguous.

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: use this when searching publishers by topic with sort/limit options. It does not explicitly mention alternatives or exclusions, though the sibling tool names provide context. Without explicit 'when to use vs. alternatives' guidance, it falls at the 'implied usage' level.

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