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

Annotations already declare readOnlyHint, idempotentHint and closed-world (openWorldHint=false), so the safety profile is covered. The description adds the shape of returned content, which is some value, but discloses nothing beyond annotations about filtering behavior or limits.

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?

A single front-loaded sentence with no wasted words; the verb and resource lead. The field enumeration is mildly redundant against the existing output schema but is short enough not to bloat the definition.

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 read-only list tool with annotations and an output schema, the definition is mostly adequate. The notable gap is the unexplained category filter parameter; return-value detail is already covered by the output schema.

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 0% and the one parameter (category, an enum of Blog/Product/Dev/Social/Event) is never explained. The description says templates have 'categories' in the output, but never indicates that the category parameter filters the list, so the filter semantics are left entirely to guesswork.

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 (List) and resource (Open Graph card templates) and enumerates the notable fields returned, so the agent knows exactly what comes back. It does not name the complementary sibling build_open_graph, so sibling differentiation is only implied by 'List'.

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?

There is no explicit when-to-use statement or named alternative, but the tool's role as a discovery step ahead of build_open_graph is strongly implied by the purpose. An agent can infer it should call this to find a template id before building.

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