MTG Bench

find_synergies

Read-only

Given one or more cards the user ALREADY has, find cards that work with them. Seeded by example rather than by description: pass the cards, get partners. Use semantic_card_search instead to describe a desired effect in words, and search_cards for structured filters. limit defaults to 10 and caps at 100 per call.

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": {
      "cardNames": "<cardNames>"
    },
    "name": "find_synergies"
  }
}

Input Schema

Name	Required	Description	Default
`limit`	No
`types`	No
`colors`	No
`format`	No
`cardNames`	Yes
`manaValueMax`	No
`manaValueMin`	No

Output Schema

Name	Required	Description	Default
`results`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

First observedAug 9, 2026

TDQS

A4.2/5.0

Behavior4/5

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

Annotations already declare readOnlyHint=true, so the agent knows this is safe. The description adds behavioral details beyond that: 'Seeded by example rather than by description' and the `limit` default/cap. No contradictions with annotations. However, it does not mention any potential quirks or response structure, but output schema exists.

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 sentences, each serving a distinct purpose: the core function, alternatives/usage, and limit behavior. No redundancy or filler. Front-loaded with the primary purpose, making it easy to parse.

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?

Given that the tool has 7 parameters and zero schema descriptions, the description is not fully complete. It covers the core input (`cardNames`) and `limit`, but leaves multiple filter parameters undocumented. It also does not contrast with the similar sibling `find_combos`, though it does distinguish from `semantic_card_search` and `search_cards`. The presence of an output schema mitigates some completeness gaps.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters2/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0%, so the description must compensate. It only explains `limit` (defaults to 10, caps at 100) and implies `cardNames` means card names. The other parameters (`types`, `colors`, `format`, `manaValueMax`, `manaValueMin`) are left entirely unexplained, leaving the agent guessing about their allowed values and semantics.

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: 'Given one or more cards the user ALREADY has, find cards that work with them.' It uses a specific verb (find) and resource (cards), and explicitly distinguishes from siblings by contrasting 'semantic_card_search instead' and 'search_cards for structured filters.'

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?

Provides explicit when-to-use guidance: 'Given one or more cards the user ALREADY has' and explicitly names alternatives with instructions ('Use semantic_card_search instead to describe a desired effect in words, and search_cards for structured filters'). Also includes the `limit` default and cap, adding practical usage context.

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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