Returns daily posting limit status for the given channels on the specified date.

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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint and destructiveHint=false, so the safety profile is covered. The description adds genuine behavioral context beyond that: single request with no automatic pagination, and that provider errors surface as failures even with HTTP 200.

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?

Purpose is front-loaded in the first sentence and the operational notes follow efficiently. There is minor redundancy: the title duplicates the opening sentence and a doubled period ('date..') appears, but the text remains tight overall.

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, single-request tool with 100% schema coverage and annotations covering the safety profile, the description supplies the remaining essentials: pagination behavior, error semantics, and the upstream operation name. No output schema exists, so the return-value explanation is not required.

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%, so every parameter (date, fields, account, payload, channelIds, payload_file) is already documented in the schema. The description only echoes the 'fields' bounding idea without adding new syntax or format detail, so the baseline 3 applies.

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 states a specific verb and resource: 'Returns daily posting limit status for the given channels on the specified date,' and names the underlying operation (Buffer GraphQL dailyPostingLimits). This distinguishes it from siblings like get_channel or get_channels, though it does not explicitly contrast with any alternative.

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?

'Use upstream fields to bound data' implies how to control result size, and noting that errors may occur despite HTTP 200 is useful. However, there is no explicit when-to-use vs when-not guidance, nor any pointer to a sibling alternative.

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