reddit_list_user_posts

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

The description adds a valuable non-obvious behavior beyond the readOnlyHint: Reddit only serves roughly the last 1000 items and full history cannot be reconstructed. However, the claim 'newest first by default' conflicts with the schema's declared default of 'hot' for the sort parameter, which misleads the agent about actual default behavior.

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?

Two sentences with no filler. The first gives the core action and resource; the second delivers an important limitation. Information is front-loaded and every sentence earns its place.

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 read-only listing tool with a well-documented schema, the description covers the essential purpose, ordering default, and the critical 1000-item pagination ceiling. The main gap is the contradictory default ordering statement, which forces the agent to resolve the mismatch between description and 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 coverage is 100% and all five parameters are thoroughly documented with enums, defaults, and constraints, so the baseline is 3. The description contributes no additional parameter-level guidance and actually introduces conflict by saying 'newest first by default' while the schema default for sort is 'hot'.

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 states the action ('List the posts'), the resource ('an account has submitted'), and a key ordering detail ('newest first by default'). This readily distinguishes it from sibling tools like reddit_list_user_comments (comments) or reddit_get_post (single post).

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?

It gives clear context for when this tool is appropriate: listing posts submitted by a specific account. The 1000-item limitation also usefully tells agents when pagination cannot recover full history. However, it does not explicitly name alternative tools or state when not to use it, so it falls 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.