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

No annotations are provided, so the description carries the full behavioral burden. It says what the operation does but not whether the output is a new decrypted file, where it is returned, whether the original is preserved, or what happens on a wrong password. For a mutation-style tool with zero annotation coverage this is a meaningful gap.

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?

Front-loads the operation in one sentence, then documents the two parameters in a compact list. Every line carries information; it is slightly terse rather than padded, which is appropriate here.

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 values need not be explained. However, for a tool with no annotations and no sibling-differentiation, the description leaves out error behavior and output handling, making it only minimally complete.

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 0%, so the description must compensate, and it does: it defines file_url as the public URL of the protected PDF and password as the password used to remove protection. This adds real meaning beyond the bare typed properties, though it omits format constraints such as URL scheme.

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: removes password protection from a PDF. It is clearly distinguishable from siblings like protect_pdf or flatten_pdf. It does not explicitly name the inverse tool (protect_pdf) to differentiate, so it falls short of a 5.

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?

No guidance on when to use this versus alternatives such as protect_pdf, nor any prerequisites (e.g. that the PDF must actually be encrypted, or that the password must be correct). The agent must infer usage from the name alone.

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