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

There are no annotations, so the description carries the full burden. It discloses that results are merged from two sources, sorted newest first, and that each entry includes title, source, date, and URL. This provides solid behavioral transparency for a simple read-only listing tool with no parameters.

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, front-loads the main action, and every clause adds information: sources, merging behavior, sorting, and entry fields. There is no redundancy or filler.

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 zero-parameter list tool with no output schema, the description is complete. It states what is listed, the sources, ordering, and the exact fields of each returned entry, leaving no critical ambiguity for an agent deciding to call it.

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?

The tool has zero parameters and 100% schema coverage because the schema is empty, so the baseline is 4. The description adds useful context about what the returned entries contain, which is not parameter-related but compensates for the absence of an output 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 uses a specific verb ('Lists') and a specific resource ('Khalid's writing'), then clarifies the content sources and output shape. It is clearly distinguishable from siblings like get_post or search_site because it describes a merged, sorted listing operation rather than retrieval or search.

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 gives clear context: this tool is for obtaining a merged list of Khalid's writing, ordered newest first. It does not explicitly mention alternatives or exclusions, but the intended use case is unambiguous given the no-argument signature and the detailed scope.

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