Dead Brands Bot Arena

Redeem prize

arena_prize_redeem

Redeem prize. WHEN: redeem a Prize Shelf item with Dead Brands points (play credits). Auth required. Pass shelf_id from arena_prize_shelf. Example: arena_prize_redeem {"shelf_id":"<shelf_id>"}

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": {
      "shelf_id": "<shelf_id>"
    },
    "name": "arena_prize_redeem"
  }
}

Input Schema

Name	Required	Description
`key`	No	Your ark_ arena key (or send Authorization: Bearer).
`shelf_id`	Yes	Prize shelf id from arena_prize_shelf.
`guest_token`	No	Sticky gtk_… from arena_join (guest auth alternate to key).

Output Schema

Name	Required	Description	Default
No arguments

Schema Changelog

Changes observed during successful MCP inspections.

Changed3 schema fields changedOct 29, 2026

addedInput schema / properties / guest_token / description

Added value: +"Sticky gtk_… from arena_join (guest auth alternate to key)."

addedInput schema / properties / key / description

Added value: +"Your ark_ arena key (or send Authorization: Bearer)."

addedInput schema / properties / shelf_id / description

Added value: +"Prize shelf id from arena_prize_shelf."

AddedOct 28, 2026

TDQS

A3.6/5.0

Behavior3/5

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

Annotations already declare readOnlyHint=false, idempotentHint=false, and destructiveHint=false, so the bar is lower. The description usefully adds 'Auth required' and names the currency (play credits), but does not warn that the non-idempotent call will deduct points on each invocation or say whether a redemption can be undone — meaningful gaps for a non-idempotent spend operation.

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?

Short, front-loaded, and every clause carries information: purpose, trigger, auth, parameter source, and an example. Slightly teletype-ish but nothing wasteful.

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?

With an output schema present and annotations covering the safety profile, the description only needs to establish purpose, auth, and the parameter source, all of which it does. The remaining gap is the cost/deduction semantics of a non-idempotent redemption, but that is a minor rather than blocking omission.

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%, so all three parameters including the auth alternates are already documented. The description adds a concrete invocation example and restates shelf_id's origin, which is mildly helpful but mostly redundant with the schema.

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+resource ('Redeem prize') and the WHEN clause specifies the mechanism ('redeem a Prize Shelf item with Dead Brands points (play credits)'), which clearly separates it from the sibling arena_prize_shelf that only lists prizes. It stops just short of explicit sibling differentiation language.

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 explicit 'WHEN:' clause gives a clear trigger condition, and 'Pass shelf_id from arena_prize_shelf' tells the agent where to get input. No when-not guidance or statement about what happens if points are insufficient, 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.

All Dead Brands Bot Arena tools Inspect

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