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

Annotations already declare readOnlyHint, openWorldHint, idempotentHint, and destructiveHint=false, covering safety and side effects. The description adds behavioral context by specifying the return structure (timestamp plus blog entry or comment text) and the global scope ('anywhere on Codeforces'). It does not mention ordering or limitations, but the annotations and schema cover operational safety, so the added value is sufficient.

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 two sentences and generally concise, packing useful information. However, the first sentence is grammatically awkward ('Codeforces competitive-programming site — the global recent-actions feed, the newest blog entries...'), which slightly detracts from clarity. It could be streamlined without losing meaning.

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?

For a simple tool with one optional parameter, an output schema, and comprehensive annotations, the description is complete. It explains the tool's purpose, the content of the returned actions, and the global scope. It does not need to describe return values since an output schema exists, and it covers all essential behavioral aspects.

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% for the single optional parameter max_count, with the schema already explaining the range and default. The description does not add any information about this parameter, so it receives the baseline score of 3. The description does not compensate for anything missing in 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?

The description clearly identifies the tool as the global recent-actions feed on Codeforces, listing the specific content (blog entries and comments) and what each action returns (timestamp plus entry/comment details). This distinguishes it from sibling tools like blog_entry_view (single entry) and recent_changes, making the purpose explicit and 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 provides a clear context for usage: 'Answers what the Codeforces community is posting and discussing right now.' This implies when to use it (for the global live feed), though it does not explicitly name alternatives or state when not to use it. It offers clear context but lacks explicit exclusions.

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