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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false; the description adds genuinely new behavior beyond them by stating the call returns procedural instructions rather than performing the archive, and that it opens nothing by itself. It also discloses the absence of an official Instapaper MCP server, which explains why the browser delegation is required. Missing: any note on whether the returned guidance is cached or version-dependent.

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 functional content is front-loaded and tight, but the trailing sentence about Instapaper's REST API v2 and the 'checked 17 Oct 2026' audit note is meta-commentary that does not help an agent invoke the tool. The parenthetical date and API-version trivia could be dropped without loss.

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?

Given a zero-parameter tool with no output schema, the critical unanswered question is how the agent conveys which article to archive — the description is silent on this, and the empty schema leaves it unresolved everywhere. It does cover what the call returns (screens, buttons, fields) and the follow-up tool family, so the picture is adequate but has a practical hole.

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?

The tool takes zero parameters and schema coverage is 100%, so there is no parameter surface for the description to explain — baseline 4 applies. The description adds nothing that could mislead about inputs, though it also does not address how the target article is identified given the empty parameter list.

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 the resource and intent ('Archive article in the user's own Instapaper account') and then clarifies the actual operation: it returns step-by-step instructions and 'opens nothing by itself.' The two sentences together make the real purpose unambiguous, though the opening line reads momentarily like an action tool and no instapaper_* sibling (e.g. instapaper_move_to_folder, instapaper_save_url) is named for contrast.

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?

Gives a clear usage path: call this first to get the screen/button/field sequence, then perform the action with the cotlet_browser_* tools in the Instapaper Cloud Browser. It does not state when NOT to use it (e.g. when an API-backed archive exists), but the intended workflow is explicit enough to act on.

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