List capability index
list_capabilitiesRead-onlyIdempotent
List capabilities in the 404 catalog with tool counts. Use to explore the Capability Graph before searching.
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
No arguments | |||
404.directory
Schema Changelog
Changes observed during successful MCP inspections. Dates show when Glama detected each change.
- Added
TDQS
A4.2/5.0
Behavior3/5
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false. The description adds context about tool counts and the 404 catalog but does not disclose additional behavioral traits such as output shape, pagination, or limits. No contradiction exists.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Conciseness5/5
Is the description appropriately sized, front-loaded, and free of redundancy?
Two concise sentences, front-loaded with the action and resource, with no filler or redundant information.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Completeness4/5
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a simple zero-parameter tool with strong annotations, the description covers purpose and usage context adequately. Since there is no output schema, a bit more detail about the exact return format could improve completeness, but it is sufficient as-is.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Parameters4/5
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
The tool has zero parameters and schema coverage is 100%, so the description does not need to explain parameter semantics. The baseline of 4 applies.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Purpose5/5
Does the description clearly state what the tool does and how it differs from similar tools?
The description uses a specific verb ('List') and identifies the exact resource: 'capabilities in the 404 catalog with tool counts.' It also ties the tool to Capability Graph exploration, which helps distinguish it from search or recommendation siblings.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Usage Guidelines4/5
Does the description explain when to use this tool, when not to, or what alternatives exist?
The description gives clear usage context: 'Use to explore the Capability Graph before searching.' It does not explicitly state when not to use it or name alternatives, so it falls short of a 5.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
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TDQS
A4.2/5.0
Disambiguation4/5
Tools are mostly distinct with clear descriptions. Potential overlap exists among search_tools, recommend_tools, list_capabilities, and get_capability_graph, but each serves a different purpose (query vs. recommendation vs. high-level list vs. relational graph). inspect_tool_server vs. get_tool (server vs. tool) and verify_web vs. understand_webpage (reachability vs. content) are clearly separated. Minor ambiguity between list_capabilities and get_capability_graph, but descriptions clarify.
Naming Consistency5/5
All tool names follow a consistent verb_noun pattern (e.g., compare_tools, get_tool, search_tools, verify_web). No mixing of camelCase or inconsistent styles. The naming is uniform and predictable.
Tool Count5/5
12 tools is within the ideal 3-15 range and appropriate for a directory service that provides search, retrieval, comparison, recommendation, inspection, invocation, and web verification. The count is comprehensive without being overwhelming, and each tool adds distinct value.
Completeness4/5
The tool set covers core directory operations (search, get, compare, recommend) and additional utilities (inspect, invoke, trust score, capability graph). It lacks a direct 'list all tools' or 'list all servers' endpoint, but search_tools and list_capabilities can approximate this. The inclusion of web verification and understanding tools extends beyond the catalog domain, but they are useful adjuncts. Overall, the surface is well-rounded with minor gaps.