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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is fully covered without description help. The description contributes some return-shape context about 'customFields' and its 'entity' values, but omits pagination, ordering, or completeness caveats.

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?

The core purpose is front-loaded in the first clause, and the following sentences are short and readable. The 'customFields' explanation is somewhat detailed relative to a single-parameter read tool, but it is not padded or repetitive.

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?

A low-complexity, single-optional-parameter read tool with an output schema, so return values need no further explanation. The description covers scope and output semantics adequately; only usage-vs-alternatives guidance is thin.

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% for the single optional 'keyword' parameter, so the schema already carries its meaning. The description does not reference 'keyword' at all, so it adds nothing beyond the structured field; 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+resource ('Retrieve a list of all accessible Testiny projects') and adds scope detail about the custom fields returned. It is inherently distinct from all siblings, which handle folders, test cases, runs, and results rather than projects, though no sibling is named.

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?

Provides a clear instruction on how to consume the output ('Filter by entity before using them'), which is genuine usage guidance. However, it says nothing about when to call this tool versus alternatives, prerequisites, or whether 'keyword' should be used for narrowing.

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