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 that it makes a single GET call and returns that response verbatim, which is useful context about the pass-through nature, but says nothing about pagination, result size, or behavior when all optional filters are omitted.

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?

It leads with the endpoint call, which is good front-loading, but the first fragment 'Instruction Names.' duplicates the title and wastes a sentence. The remaining sentences are compact but the middle one is redundant with the purpose already implied.

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?

An output schema exists, so return shape need not be explained, and the description correctly states it is a single-endpoint pass-through lookup. What is missing is what happens with zero arguments (presumably all instruction names) and whether the four filters are ANDed — a modest gap for a 4-optional-param tool.

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 filters (ixName fuzzy search, programName, callingInstructions discriminant, callingProgramAddress) are already documented in the schema. The description adds no semantics about how the filters combine or which takes precedence, so it lands at the baseline.

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 names a specific resource and action: fetching available token instruction names for Solana programs via a named endpoint. That is more than a restatement of the title, though the opening 'Instruction Names.' sentence is a tautology and no sibling (e.g. list-labeled-programs, list-supported-dexes) is named to sharpen the boundary.

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 to filter and categorize on-chain token program interactions' hints at intent but gives no conditions, no exclusions, and no alternative tools to choose instead. An agent can infer it is a reference-lookup list tool, but only by reading the schema.

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