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

Annotations already disclose the mutation profile (readOnlyHint=false, destructiveHint=false, idempotentHint=true, openWorldHint=true). The description adds genuinely new behavior: the siteUrl is re-validated against the caller's LIVE Bing site list on every call and fails if access was revoked. It does not describe what happens to a prior link beyond 'repoint', which the idempotent hint partially covers.

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?

Two tightly written sentences, zero filler, and the key constraint (live re-validation / failure mode) is front-loaded rather than buried.

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 two-parameter mutation tool with full annotation coverage and no output schema, the description covers the critical risk (stale or revoked site URL) and the source of valid input. Only the outcome of repointing an already-linked site is left implicit.

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 both parameters are already documented (siteUrl's provenance, projectId's source). The description reinforces the verbatim-from-list_bing_sites constraint and adds the live re-validation rule, but adds little beyond what the schema states. Baseline 3 is appropriate.

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 ('Link (or repoint) a project's Bing Webmaster site'), including the repoint/overwrite nuance. Easily distinguished from siblings like list_bing_sites, disconnect_bing, and save_bing_crawl_settings.

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?

Tells the agent where the required siteUrl value must come from (list_bing_sites) and warns that the value is re-validated against the live site list, so stale values fail. There is no explicit when-not-to-use guidance, but the context for correct invocation is clear.

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