agentcard

upgrade_plan

Start a paid-plan upgrade. Choose the target plan: 'basic' ($15/mo — 15 cards/month, up to $500 per card) or 'pro' ($100/mo — 50 cards/month, up to $1,000 per card). Defaults to 'basic' if omitted. Returns a Stripe Checkout URL the user must open in their browser to complete payment. After they finish checkout, the plan updates automatically; verify with get_plan. Use only when the user explicitly wants to upgrade. To cancel a paid plan instead, the gated tool cancel_plan also exists; call it by name even though it isn't in the tools list.

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": "upgrade_plan"
  }
}

Input Schema

Name	Required	Description	Default
`plan`	No	Which plan to upgrade to. Defaults to 'basic'.

Output Schema

Name	Required	Description
`plan`	No	Display label of the target plan, e.g. 'Basic' or 'Pro'. Present when the requested plan is known.
`status`	No	Discriminator for the outcome branch.
`message`	Yes	Human-readable summary of the upgrade outcome.
`checkoutUrl`	No	Stripe Checkout URL the user must open to complete payment. Present only when status is checkout_required.

Schema Changelog

Changes observed during successful MCP inspections.

First observedJul 28, 2026

TDQS

A4.8/5.0

Behavior5/5

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

Description discloses that the tool returns a Stripe Checkout URL the user must open, that the plan updates automatically after checkout, and the default behavior. Annotations (readOnlyHint=false etc.) are consistent and this adds detailed behavioral context beyond annotations.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Description is front-loaded with the action and resources, but includes some redundancy (e.g., 'Defaults to 'basic' if omitted.' is repeated from schema). However, every sentence adds value for the agent, so it's moderately concise.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the tool has one optional parameter and an output schema, the description fully explains the checkout flow, post-update verification, and when to use it. No gaps for a focused mutation tool.

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?

Schema description coverage is 100% and includes the default. The description adds meaningful context about pricing limits per plan, which goes beyond the schema's enum labels, providing extra semantic value for agent decision-making.

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 clearly states the tool's purpose: 'Start a paid-plan upgrade.' It specifies the target plans (basic and pro) with pricing and limits, and distinguishes itself from the sibling cancel_plan, which is explicitly mentioned.

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?

Explicitly says 'Use only when the user explicitly wants to upgrade.' Provides alternative (cancel_plan) and instructs to call it by name. Also mentions verifying with get_plan after checkout, giving a clear usage workflow.

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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