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Next opening

next_available_slot
Read-onlyIdempotent

Returns the next free opening in the calendar, without taking it. Use it to tell the user when a post would go out before scheduling it.

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": "next_available_slot"
  }
}

Input Schema

NameRequiredDescriptionDefault
accountIdNoOnly consider slots that publish to this account.

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observed

TDQS

A4/5.0
Behavior4/5

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

Annotations already declare readOnly/idempotent/non-destructive, so the bar is lower. The description nonetheless adds the key behavioral nuance that the slot is not reserved ('without taking it'), which is not captured by any annotation. It stops short of describing the returned value's structure.

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 tight sentences with zero waste; the core behavior (returns, does not take) is front-loaded and the usage note follows immediately.

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 one-parameter read tool with no output schema, the description covers what it does, that it is non-committal, and when to call it. The one remaining gap is the shape of the returned slot (time, account), which is not described.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100% with a single parameter whose description already explains its filtering effect. The description adds no syntax or additional meaning beyond what the schema provides, so baseline 3 applies.

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 (returns the next free opening in the calendar) and 'without taking it' distinguishes it from a slot-creating sibling like create_slots. It does not name any sibling explicitly, keeping it just below a 5.

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?

'Use it to tell the user when a post would go out before scheduling it' gives a clear triggering context (preview before scheduling). It does not name an alternative tool or state exclusions, 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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