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List Calendar Authors

list_calendar_authors
Read-onlyIdempotent

List known calendar event authors loaded from configured follow sets (NIP-51 kind 30000). Returns author names, pubkeys, and NIP-05 identifiers. Use the returned pubkeys with search_calendar_events(authors: [...]) to filter events by author.

Tool call template

This tool declares no required parameters. Add optional parameters from the input schema as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {},
    "name": "list_calendar_authors"
  }
}

Input Schema

NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changed
    • addedInput schema / additionalProperties
      Added value: +false
  2. Changed1 schema field changed
    • changedInput schema / $schema
      Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"
  3. First observed

TDQS

A4.1/5.0
Behavior4/5

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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so safety is covered; the description adds value by naming the underlying data source (configured follow sets, NIP-51 kind 30000) and enumerating the returned fields (names, pubkeys, NIP-05 identifiers). It does not mention whether the list is cached, empty when no follow sets are configured, or how large it can grow.

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?

Three short sentences: identity/source first, return shape second, follow-up action third. Every sentence carries distinct information and nothing is repeated from the annotations or schema.

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?

With no input parameters and no output schema, the description carries the burden of describing return values, which it does by listing names, pubkeys and NIP-05 identifiers. The only remaining gap is edge-case behavior, such as what happens when no follow sets are configured.

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 takes zero parameters and the schema is an empty object, so there is nothing for the description to disambiguate; the baseline for a parameterless tool applies. The description correctly makes no parameter claims.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb and resource ('List known calendar event authors') and pins down the source ('loaded from configured follow sets (NIP-51 kind 30000)'), so an agent knows exactly what population is returned. It does not distinguish itself from the nearby list_known_authors sibling, leaving some ambiguity about which author listing to pick.

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?

Gives explicit downstream usage: 'Use the returned pubkeys with search_calendar_events(authors: [...]) to filter events by author,' which is exactly the chaining guidance an agent needs. It stops short of stating when not to call this tool or when to prefer list_known_authors instead.

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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