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chrischall

signupgenius-mcp

by chrischall

signupgenius_rsvp

RSVP to a SignUpGenius sign-up with a Yes, No, or Maybe response, including guest counts and an optional comment. For slot-based sign-ups, use the slot-claiming tool instead.

Instructions

RSVP to a SignUpGenius sign-up (the Yes/No/Maybe-style sheets, including invitations from family/friends). Walks the PreProcessSignup → getSignupInfo → processSignUpFormHandler flow under the hood. Writes data — confirm with the user before invoking. Slot-based sign-ups (e.g. "claim the 3pm slot") are NOT handled here — use signupgenius_claim_slot for those.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
urlYesSignUpGenius sign-up URL (https://www.signupgenius.com/go/<slug>) or just the slug.
emailYes
adultsNoAdult guest count. Defaults to 1 for yes/maybe, 0 for no.
commentNoOptional comment shown to the sign-up owner.
childrenNoChild guest count. Defaults to 0.
lastnameYes
responseYesRSVP response. Maps to the wizard's Yes / No / Maybe buttons.
firstnameYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changedv1.8.1
    • changedInput schema / properties / email / pattern
      Previous value: -"^(?!\\.)(?!.*\\.\\.)([A-Za-z0-9_'+\\-\\.]*)[A-Za-z0-9_+-]@([A-Za-z0-9][A-Za-z0-9\\-]*\\.)+[A-Za-z]{2,}$"New value: +"^(?:[A-Za-z0-9_'+\\-]+\\.)*[A-Za-z0-9_'+\\-]*[A-Za-z0-9_+-]@(?:[A-Za-z0-9][A-Za-z0-9\\-]*\\.)+[A-Za-z]{2,}$"
  2. First observedv1.3.0

TDQS

A4.4/5.0
Behavior4/5

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

Annotations only indicate readOnlyHint=false, but the description adds critical behavioral context: 'Writes data — confirm with the user before invoking.' It also discloses that the tool walks a multi-step internal flow, helping the agent understand it automates a wizard rather than a simple API call.

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 tight sentences with no filler. The purpose is front-loaded, the write behavior and user-confirmation requirement are included, and the exclusion of slot-based workflows is handled in one clear sentence.

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 write tool with no output schema and eight parameters, the description covers the essential context: what it does, what kind of sign-ups it applies to, what it does not handle, and the need for user confirmation. It does not describe return values or failure behavior, but those are less critical given the clear usage and safety guidance.

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 about 63%, and the input schema already documents url, email, adults, children, comment, and response. The description adds little parameter-level meaning beyond clarifying that response values map to the wizard's Yes/No/Maybe buttons; firstname and lastname remain undocumented but are self-explanatory.

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 states a specific verb and resource: RSVP to a SignUpGenius sign-up using Yes/No/Maybe responses. It also explicitly distinguishes this tool from slot-based sign-ups by naming signupgenius_claim_slot, so an agent can tell them apart immediately.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description clearly says when to use this tool: for Yes/No/Maybe-style sheets, including invitations from family and friends. It also gives an explicit when-not-to-use condition and names the alternative tool, signupgenius_claim_slot, for slot-based sign-ups.

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