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

Annotations already declare readOnlyHint and openWorldHint, so the safety profile is covered; the description adds real context on top by naming the external host contacted and summarizing the return payload (names, descriptions, remote URLs) and cost ('Free'). It omits result-count limits or pagination behavior, which keeps it from a 5.

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?

Three short, front-loaded sentences: action, return shape, cost. Nothing is wasted, though the one-word 'Free.' sentence is clipped and could have been folded into the previous sentence for smoother structure.

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 one-parameter read-only search with no output schema, the description covers what the tool does, where it goes, and roughly what comes back. Missing only operational detail such as result limits or pagination, which is a modest gap rather than a blocker.

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 single parameter is fully described in the schema (100% coverage), so the baseline of 3 applies. The phrase 'matching a text' slightly reinforces that query is free-text rather than an ID, but adds no syntax, filtering, or matching-rule details.

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+resource ('Search the official MCP Registry') plus the concrete upstream endpoint (registry.modelcontextprotocol.io), and scopes it to text-matching servers. No sibling performs registry search, so no disambiguation is needed and an agent can identify the tool immediately.

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 implied by the purpose — use it to look up MCP servers by text — but the description never says when to prefer it over adjacent siblings like bursia_check_mcp_discovery or bursia_agent_readiness, nor does it state any prerequisites or exclusions. 'Free' hints there is no key/cost barrier, which is useful but indirect.

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