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

readOnlyHint=true already establishes this is a safe read, so the bar is lower. The description adds value by enumerating the returned fields, but discloses nothing about pagination behavior, rate limits, or how the validity window is represented; with annotations carrying the safety profile this is adequate but thin.

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 naming the resource and its returned fields, followed by a terse endpoint reference. Nothing is padded, though the endpoint line is marginal value for an agent that only needs to call the tool.

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?

With no output schema, the description usefully compensates by listing the fields returned, and the schema fully covers the inputs. It omits any note on pagination semantics across pages, which is a minor gap for a list endpoint.

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 all four parameters (page, page_size, event_slug, account_slug) are already documented in the schema. The description adds no syntax, default, or range detail beyond that, 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?

States a specific verb and resource ('List an event's discount codes') and enumerates the returned fields (code, type, value, quantity, quantity_used, validity window, releases), which distinguishes it from the singular tito_get_discount_code. It stops short of explicitly naming the sibling it is not, so it is clear but not fully differentiated.

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 when-to-use guidance, no condition selecting this over tito_get_discount_code, and no prerequisites beyond the endpoint reference. The 'Tito: GET /:account/:event/discount_codes' line documents the upstream call but tells the agent nothing about when to reach for this tool.

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