Cofferline

set_auto_topup

Configure auto-topup: when the prepaid balance falls below threshold_usd, the platform settles one of the pre-signed EIP-3009 authorizations you supply (signed outside MCP — this server cannot sign). Auth required.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "threshold_usd": "<threshold_usd>",
      "authorizations": "<authorizations>"
    },
    "name": "set_auto_topup"
  }
}

Input Schema

Name	Required	Description
`max_per_month`	No	cap on automatic top-ups per month (default 10)
`threshold_usd`	Yes	refill when balance drops below this, USD decimal string
`authorizations`	Yes	pre-signed transferWithAuthorization payloads: each {from, to, value, valid_after, valid_before, nonce, signature}

Schema Changelog

Changes observed during successful MCP inspections.

First observedAug 20, 2026

TDQS

A4.1/5.0

Behavior3/5

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

With no annotations, the description carries the burden. It discloses a critical limitation ('this server cannot sign') and auth requirements, but does not explain side effects like replacing existing auto-topup config, impact on balances, or behavior when authorizations are spent or expire. The provided constraints are useful but incomplete.

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?

A single, dense sentence packs the core purpose, trigger condition, key restriction (no signing), and auth requirement. Every clause earns its place, and it is front-loaded with the action. No filler or redundancy.

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

Completeness3/5

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

The description covers the trigger and input but omits post-configuration behavior (e.g., confirmation, how to check existing config via get_auto_topup, or whether settings are replaced). Since there is no output schema and no annotations, a little more context about effects and verification would improve completeness, though it is adequate for a straightforward config 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?

The schema has 100% coverage, so a baseline of 3 applies. The description adds meaning by explaining that 'threshold_usd' triggers the top-up and that 'authorizations' are pre-signed payloads used for settlement. It does not elaborate on 'max_per_month' but that is adequately described in the schema. Overall, it enhances understanding beyond the raw schema.

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 opens with 'Configure auto-topup', specifying the exact action and resource. It then explains the trigger condition (balance below threshold) and the mechanism (pre-signed EIP-3009 authorizations), which clearly distinguishes it from siblings like get_auto_topup, remove_auto_topup, and topup_balance.

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 conveys when the tool is used (when configuring automatic refills) and includes a key prerequisite ('Auth required' and the need for pre-signed authorizations). It does not explicitly list alternatives, but the context of configuring vs. manual top-up (topup_balance) is implied.

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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