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

Annotations only supply readOnlyHint=true, and the description goes well beyond that: it discloses freshness rules (fields present only when the server answered within 7 days, null otherwise), the tokenizer used for the estimate (o200k_base), the provenance of tool entries (tools/list), and an explicit prompt-injection warning that names/descriptions are untrusted data. That is exactly the behavioral context an agent needs and cannot get from structured fields.

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?

Purpose is front-loaded in the first sentence, then field-level semantics follow. The text is dense but each sentence carries information, and since no output schema exists the return-value detail is load-bearing rather than filler; only the multi-clause sentences around the 7-day rule could be tightened.

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?

With no output schema, the description does the heavy lifting on return values and does it well for the volatile fields, plus provenance and trust warnings. It is still incomplete in that 'verification facts' is asserted but never explained, the remaining record fields are not enumerated, and no behavior is given for an unknown/unresolvable id.

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% — both id and search_id are documented in the schema, including format examples and the purpose of search_id. The description adds no syntax, format, or constraint detail about either parameter, so the 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?

The opening sentence gives a specific verb and resource ('Return the full registry record for one MCP server') plus the scope of what is included (verification facts, installable clients). However, it never names or contrasts the closest sibling get_install_config, even though 'which clients it can be installed into' overlaps with what an install-config tool would plausibly return, leaving minor ambiguity at 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?

Usage is only implied: the 'search_id from the search_tools result that led you here' hints at a search-then-fetch workflow, and the optional search_id note nudges the agent to pass provenance. There is no explicit when-to-use statement, no when-not, and no disambiguation from get_install_config, so an agent must infer the routing.

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