get_fixture_difficulty

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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds the rating scale semantics (1=easiest, 5=hardest) and the home/away tagging, which is genuine added context, but it says nothing about what is returned or how the rating is computed. It also states a '3 to 10 fixtures' window while the schema permits 1-10, creating ambiguity about valid 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?

One front-loaded sentence that leads with the verb and resource, with no filler. It is dense with stacked parentheticals (FDR, scale, window range), which hurts scannability slightly but nothing is redundant.

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?

No output schema exists, so the description carries the burden of explaining the return value; it names the ranking and difficulty tags but not the actual fields an agent would receive. Given a simple 3-parameter read-only tool this is close to adequate, but the window-range mismatch and missing return detail leave gaps.

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 three parameters are already documented with examples, enum values and defaults; baseline is 3. The description's window range ('3 to 10') actually conflicts with the schema's minimum of 1 and default of 5, which slightly undermines rather than adds meaning.

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 ('Retrieve upcoming Fixture Difficulty Ratings (FDR)') plus the output shape: clubs ranked easiest to toughest with home/away difficulty tags on a 1-5 scale. It does not name or differentiate against siblings like get_fixtures or get_fpl_gameweek_briefing, so an agent must infer the boundary itself.

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?

Usage is only implied: the FDR framing signals 'use this to compare schedule difficulty', but there is no explicit when-to-use, when-not-to-use, or pointer to an alternative tool. An agent could reasonably confuse it with get_fixtures for fixture listing.

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