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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=true, so the safety profile is covered. The description adds genuinely new behavioral context in the form of a cost ('Cost: 2 credits'), but says nothing about failure modes for malformed CSRs, signature verification, or rate limits.

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 plus a parenthetical cost line — efficient and readable. Minor waste in the redundant 'CSR Parser: CSR Parser' restatement of the title.

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?

For a single-required-parameter read-only parser with an output schema, this is essentially sufficient: the input format is specified by the schema, the cost is surfaced, and the general result shape is named. Only expected error behavior for invalid CSRs is missing.

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% with a PEM example, so the schema fully documents the single `csr` parameter. The description adds no format or syntax detail beyond what the schema already shows; 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?

Specific verb and resource: 'extracts and analyzes information from Certificate Signing Requests (CSRs)', plus the categories returned (subject info, public key details, fingerprints). An agent can tell it apart from siblings like SSLCertificateChecker or TLSChecker because the resource is explicitly a CSR, though it never explicitly contrasts itself with them.

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 tool obviously applies when you hold a PEM CSR. There is no explicit when-to-use statement, no when-not-to-use, and no pointer to alternatives such as SSLCertificateChecker or TLSChecker, which overlap in the certificate-inspection space.

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