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

Goes well beyond the annotations: names the required capability (manage_options), the multisite network-admin restriction because the log is shared, the exact redaction classes applied, and the 64 KB/scan truncation limits. Annotations cover read-only safety, and the description adds the operational constraints an agent actually needs.

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 purpose and scope, then parameters, then return shape, with no filler sentences. The closing note about the server marking it read-only partially restates readOnlyHint=true, a minor redundancy in an otherwise dense description.

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?

No output schema exists, yet the description enumerates every returned field (path_source, path, size_bytes, modified, lines, returned, truncated, scanned_bytes) and the failure shape ({path_source: null, reason}). Nothing needed to call or interpret the result is missing.

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%, so baseline is 3, but the description adds real meaning: grep is a plain case-insensitive match applied *after* redaction, and it clarifies the lines default/max and its interaction with the response cap. That ordering detail is not 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?

States a specific verb and resource ('Get the last lines of the PHP error log, newest last') and immediately bounds the scope to two exact paths, distinguishing it from generic status/settings readers like wp_get_site_status or wp_get_option.

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?

Explicitly says it reads only the PHP-configured error_log or wp-content/debug.log and 'never any other file', which tells the agent when this is the right tool. It doesn't name a sibling alternative for general diagnostics, so it stops short of a 5.

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