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

Annotations already declare readOnly, idempotent, non-destructive and closed-world, so the safety profile is covered. The description adds useful behavior the annotations do not: it is scoped to upcoming 2026/27 fixtures and it discloses the four content blocks returned, which matters because there is no output schema.

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?

One sentence, front-loaded with the verb and scope, with the returned sections listed compactly after the colon. Nothing is redundant or padding.

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 only two fully documented parameters and no output schema, the description supplies the missing return-value picture by naming the four intelligence sections. Minor gap: it does not say what happens when no upcoming fixture exists between the two clubs.

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 both parameters carry examples of accepted name/slug forms, so the schema already does the work. The description adds only the notion that the pair identifies an upcoming fixture, with no extra guidance on ambiguous or cross-competition club names.

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 gives a specific verb ('Retrieve') plus a specific resource ('pre-match tactical intelligence for an upcoming 2026/27 fixture') and enumerates the payload: formation clash, manager matchup, squad availability, form guide. That clearly separates it from get_match_report (post-match) and get_predicted_lineup (single-team lineup), though it never names those siblings explicitly.

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 word 'upcoming' implies this is the pre-match tool, which is real usage signal, but there is no explicit when-to-use/when-not statement and no routing to get_match_report, get_predicted_lineup, or get_fixtures. An agent must infer the boundary from sibling names alone.

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