agentcard

save_preset

Save your own preset — a named set of rules (spend caps, category/merchant/place/currency/day/hour/program restrictions) you can reuse by name in set_card_preset or create_card. Saving under a name you already used adds a new version: cards already using the old one keep it, new ones get the update. Pick a name other than the built-ins (ai_labs, weekday_meals, cli_only, daily). Pass either the rule fields below or a raw privileges array.

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": {
      "name": "<name>"
    },
    "name": "save_preset"
  }
}

Input Schema

Name	Required	Description
`mode`	No	What the preset does when a purchase breaks any of its rules: "strict" refuses it (the default), "watch" lets it through and tells the user once.
`name`	Yes	A name for this preset, e.g. "meals-only".
`total`	No	Lifetime spend cap, in US dollars.
`only_in`	No	Comma-separated places to allow charges from: a country ("US", "Canada"), a region ("europe", "eu", "north-america", "latin-america", "apac"), or a US state ("California", "US-CA"). A region expands to its countries; a state next to a region narrows only the US, e.g. "north-america,US-CA". Example: "europe,Canada".
`per_day`	No	Spend cap per rolling 24 hours, in US dollars.
`per_week`	No	Spend cap per rolling 7 days, in US dollars.
`timezone`	No	IANA timezone for only_days/only_hours (default UTC), e.g. "America/Los_Angeles". Always shown in summaries.
`only_days`	No	Comma-separated days to allow, e.g. "mon,tue,wed" or "weekdays"/"weekends".
`only_from`	No	Comma-separated callers to allow, e.g. "cli,mcp" (cli, mcp, api, browser).
`per_month`	No	Spend cap per rolling 30 days, in US dollars.
`categories`	No	Comma-separated spend categories to allow, e.g. "meals,groceries" (meals, groceries, travel, software, ai, wellness, retail).
`currencies`	No	Comma-separated purchase currencies to allow: ISO 4217 codes or common names, e.g. "usd,eur" or "dollars,euros,pounds,yen". In strict mode a purchase in another currency is refused at checkout and a settled charge in another currency pauses the card. Checked by Agentcard at checkout and settlement, not by the card network. Unknown currencies are refused.
`only_hours`	No	An hour range to allow, e.g. "9-17" (24-hour clock; defaults to UTC without timezone).
`privileges`	No	Advanced: raw privilege objects instead of the rule fields above.
`only_merchants`	No	Comma-separated merchant name patterns to allow, e.g. "openai,anthropic".

Output Schema

Name	Required	Description	Default
`preset`	No
`message`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed7 schema fields changedSep 16, 2026

addedInput schema / properties / categories

Added value: +{
+  "description": "Comma-separated spend categories to allow, e.g. \"meals,groceries\" (meals, groceries, travel, software, ai, wellness, retail).",
+  "type": "string"
+}

addedInput schema / properties / currencies

Added value: +{
+  "description": "Comma-separated purchase currencies to allow: ISO 4217 codes or common names, e.g. \"usd,eur\" or \"dollars,euros,pounds,yen\". In strict mode a purchase in another currency is refused at checkout and a settled charge in another currency pauses the card. Checked by Agentcard at checkout and settlement, not by the card network. Unknown currencies are refused.",
+  "type": "string"
+}

addedInput schema / properties / mode

Added value: +{
+  "description": "What the preset does when a purchase breaks any of its rules: \"strict\" refuses it (the default), \"watch\" lets it through and tells the user once.",
+  "enum": [
+    "strict",
+    "watch"
+  ],
+  "type": "string"
+}

removedInput schema / properties / only_categories

Removed value: -{
-  "description": "Comma-separated spend categories to allow (strict), e.g. \"meals,groceries\" (meals, groceries, travel, software, ai, wellness, retail).",
-  "type": "string"
-}

removedInput schema / properties / only_currencies

Removed value: -{
-  "description": "Comma-separated purchase currencies to allow (strict): ISO 4217 codes or common names, e.g. \"usd,eur\" or \"dollars,euros,pounds,yen\". A purchase in another currency is refused at checkout; a settled charge in another currency pauses the card. Checked by Agentcard at checkout and settlement, not by the card network. Unknown currencies are refused.",
-  "type": "string"
-}

removedInput schema / properties / watch_categories

Removed value: -{
-  "description": "Categories in Watch mode (allow + notify on mismatch instead of refuse/pause): meals, groceries, travel, software, ai, wellness, retail. Spend caps, places, time windows, and merchant-only rules stay strict.",
-  "type": "string"
-}

removedInput schema / properties / watch_currencies

Removed value: -{
-  "description": "Purchase currencies in Watch mode (allow + notify on mismatch instead of refuse/pause), e.g. \"usd,eur\". Checked by Agentcard, not by the card network. Use only_currencies or watch_currencies, not both.",
-  "type": "string"
-}

Changed2 schema fields changedSep 9, 2026

addedInput schema / properties / only_currencies

Added value: +{
+  "description": "Comma-separated purchase currencies to allow (strict): ISO 4217 codes or common names, e.g. \"usd,eur\" or \"dollars,euros,pounds,yen\". A purchase in another currency is refused at checkout; a settled charge in another currency pauses the card. Checked by Agentcard at checkout and settlement, not by the card network. Unknown currencies are refused.",
+  "type": "string"
+}

addedInput schema / properties / watch_currencies

Added value: +{
+  "description": "Purchase currencies in Watch mode (allow + notify on mismatch instead of refuse/pause), e.g. \"usd,eur\". Checked by Agentcard, not by the card network. Use only_currencies or watch_currencies, not both.",
+  "type": "string"
+}

AddedSep 9, 2026

TDQS

A4.5/5.0

Behavior4/5

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

No annotations are provided, so the description carries the full transparency burden. It discloses a non-obvious versioning behavior: re-saving a name adds a new version, existing cards keep the old one, and new cards get the update. It also warns against built-in names and clarifies that either rule fields or a privileges array can be passed, going beyond what the schema states.

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?

The description is three short sentences with no redundant wording. It front-loads the primary purpose, then covers versioning semantics, naming constraints, and input options in a clear, efficient order.

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?

For a 15-parameter creation tool with an output schema, the description covers all essential invocation decisions: what to pass, which names to avoid, how re-saving behaves, and the alternative input path. Return-value details are delegated to the output schema, so nothing critical for a correct call is missing.

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%, so the baseline is already met. The description adds the crucial either/or relationship between the rule fields and the raw privileges array, which is not obvious from the schema alone. It also provides a high-level grouping of the rule fields (spend caps, restrictions) and a name constraint for the required parameter, adding meaningful semantic guidance.

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 'Save your own preset' and immediately explains that it creates a named, reusable set of rules for use in set_card_preset or create_card. It clearly distinguishes this tool from sibling tools by framing it as an authoring action rather than an assignment action, and explicitly contrasts with built-in presets.

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 explicitly states that the saved preset is reused by name in set_card_preset or create_card, signaling when this creation step is needed. It also gives a concrete constraint ('Pick a name other than the built-ins') and clarifies the two input modes. It doesn't contrast with list_presets or delete_preset, but that omission is minor for invoking this tool correctly.

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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