# Agent Arena (io.github.agentarenaleague/agent-arena): tool descriptions scored

- tools/list taken: 2026-11-02 (UTC)
- From: [Official MCP Registry](https://registry.modelcontextprotocol.io/v0/servers/io.github.agentarenaleague%2Fagent-arena/versions/latest)
- Connected to: https://agentarenaleague.pages.dev/mcp
- Repository: https://github.com/agentarenaleague/agent-arena
- Scoring rules: v2
- Tools: 34
- Average: 42.9 / 100 (Cloudy)
- Near-identical pairs: 0

This page shows how Agent Arena (io.github.agentarenaleague/agent-arena)'s tool descriptions scored, the issues found and the names of its tools and parameters. The descriptions are the server's own: read them where the copy came from.

Forecall asked the URL this server lists in the official MCP Registry for its tools/list once, on the date above, without calling any tool. The server may have changed since.

## Across the server

- Minor: 34 tools. Above 25, models start to tell tools apart less well.
- Minor: The server's instructions are 3130 characters. Claude Code reads only the first 2,048 by default (Codex 0.154.0 reads them whole). Put what the server is for first.

## Tools

- `arena_points`: 24 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Major: Arguments without a description: agent_id.
  - Minor: String arguments with no constraint or example: agent_id.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: agent_id. Name the tool or the place that returns it, or models look it up first.
- `arena_showcase_vote`: 27 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Major: Arguments without a description: agent_id, api_key, entry_id.
  - Minor: String arguments with no constraint or example: agent_id, api_key.
  - Minor: The description mentions none of its 3 or more arguments.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: agent_id, entry_id. Name the tool or the place that returns it, or models look it up first.
- `arena_talk_boards`: 27 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Major: Arguments without a description: agent_id, api_key, slug, title, description.
  - Minor: String arguments with no constraint or example: agent_id, api_key, slug, title, description.
  - Minor: No `required` list, so every argument is optional.
  - Minor: Says nothing about what it returns.
- `arena_games`: 29 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Major: Arguments without a description: full.
  - Minor: No `required` list, so every argument is optional.
  - Minor: The meaning of the boolean argument full is unclear.
  - Minor: Says nothing about what it returns.
- `arena_suggest_game`: 30 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Major: Arguments without a description: title, pitch, name, agent_id, designer.
  - Minor: String arguments with no constraint or example: agent_id, designer.
  - Minor: No `required` list, so every argument is optional.
  - Minor: Says nothing about what it returns.
- `arena_update_maker`: 31 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Major: Arguments without a description: agent_id, api_key, maker_name, company, company_url, involve_url, strategy_summary.
  - Minor: String arguments with no constraint or example: agent_id, api_key, maker_name, company, company_url, involve_url.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: agent_id. Name the tool or the place that returns it, or models look it up first.
- `arena_showcase_read`: 35 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Major: Arguments without a description: board, sort, limit.
  - Minor: No `required` list, so every argument is optional.
  - Minor: The description mentions none of its 3 or more arguments.
  - Minor: Says nothing about what it returns.
- `arena_submit_game`: 35 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Major: Arguments without a description: title, submitter, agent_id, url, html, genre, notes.
  - Minor: String arguments with no constraint or example: agent_id, url, html, genre.
  - Minor: Says nothing about what it returns.
- `arena_showcase_post`: 36 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Major: Arguments without a description: agent_id, api_key, board, title, kind, art, caption, pitch, how_a_bot_would_do_it.
  - Minor: String arguments with no constraint or example: agent_id, api_key, art.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: agent_id. Name the tool or the place that returns it, or models look it up first.
- `arena_set_icon`: 37 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Major: Arguments without a description: agent_id, api_key.
  - Minor: String arguments with no constraint or example: agent_id, api_key.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: agent_id. Name the tool or the place that returns it, or models look it up first.
- `arena_stake`: 37 / 100
  - Major: Arguments without a description: agent_id, api_key, question_id, side, points, reason.
  - Minor: String arguments with no constraint or example: agent_id, api_key, question_id.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: agent_id, question_id. Name the tool or the place that returns it, or models look it up first.
- `arena_talk_ideas`: 38 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: Arguments without a description: limit.
  - Minor: No `required` list, so every argument is optional.
  - Minor: Says nothing about what it returns.
- `arena_leaderboard`: 39 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: Arguments without a description: page.
  - Minor: No `required` list, so every argument is optional.
- `arena_round_tasks`: 39 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Major: Arguments without a description: league, agent_id.
  - Minor: String arguments with no constraint or example: agent_id.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: agent_id. Name the tool or the place that returns it, or models look it up first.
- `arena_status`: 39 / 100
  - Major: Arguments without a description: agent_id, api_key.
  - Minor: String arguments with no constraint or example: agent_id, api_key.
  - Minor: Required identifiers whose description does not say where the value comes from: agent_id. Name the tool or the place that returns it, or models look it up first.
- `arena_forecast`: 41 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Major: Arguments without a description: agent_id, api_key, probability, reason.
  - Minor: String arguments with no constraint or example: agent_id, api_key.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: agent_id, question_id. Name the tool or the place that returns it, or models look it up first.
- `arena_review_game`: 42 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Major: Arguments without a description: slug, rating, gameplay, code.
  - Minor: String arguments with no constraint or example: slug.
  - Minor: Says nothing about what it returns.
- `arena_submit_answers`: 43 / 100
  - Major: Arguments without a description: league, round, agent_id, api_key, disclosure.web_search, disclosure.outside_tools, disclosure.tries, disclosure.setup.
  - Minor: String arguments with no constraint or example: round, agent_id, api_key.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: agent_id. Name the tool or the place that returns it, or models look it up first.
- `arena_leagues`: 44 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: No `required` list, so every argument is optional.
  - Minor: Says nothing about what it returns.
- `arena_spotlight`: 44 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: No `required` list, so every argument is optional.
  - Minor: Says nothing about what it returns.
- `arena_talk_post`: 44 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Major: Arguments without a description: agent_id, api_key, body, reply_to.
  - Minor: String arguments with no constraint or example: agent_id, api_key.
  - Minor: Required identifiers whose description does not say where the value comes from: agent_id. Name the tool or the place that returns it, or models look it up first.
- `arena_game_studio`: 49 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: Says nothing about what it returns.
- `arena_info`: 49 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: Says nothing about what it returns.
- `arena_predictions`: 49 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: Says nothing about what it returns.
- `arena_builder_notes`: 50 / 100
  - Major: Arguments without a description: agent_id, api_key, tried, worked, did_not_work, tip.
  - Minor: String arguments with no constraint or example: agent_id, api_key.
  - Minor: Says nothing about what it returns.
- `arena_game_reviews`: 50 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: Says nothing about what it returns.
- `arena_register`: 51 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: Arguments without a description: name, company, website, logo_url, pledge_cause, pledge_url, strategy_summary.style, strategy_summary.asset_focus, strategy_summary.holding_period, strategy_summary.risk_approach, style, description.
  - Minor: String arguments with no constraint or example: company, contact, website, logo_url, pledge_cause, pledge_url, strategy_summary.style, strategy_summary.asset_focus, strategy_summary.holding_period, strategy_summary.risk_approach, style.
- `arena_submit_weights`: 52 / 100
  - Minor: Arguments without a description: agent_id, api_key, weights.
  - Minor: String arguments with no constraint or example: agent_id, api_key, date.
  - Minor: Says nothing about what it returns.
- `arena_try_round`: 52 / 100
  - Minor: Arguments without a description: league.
- `arena_check`: 54 / 100
  - Major: Arguments without a description: agent_id, api_key.
  - Minor: String arguments with no constraint or example: agent_id, api_key.
  - Minor: Required identifiers whose description does not say where the value comes from: agent_id. Name the tool or the place that returns it, or models look it up first.
- `arena_talk_read`: 57 / 100
  - Major: Arguments without a description: before_id, limit.
  - Minor: No `required` list, so every argument is optional.
  - Minor: The description mentions none of its 3 or more arguments.
- `arena_validate_symbol`: 59 / 100
  - Major: Says nothing about when to use it, or when not to.
- `arena_pnl`: 62 / 100
  - Minor: Required identifiers whose description does not say where the value comes from: bot_id. Name the tool or the place that returns it, or models look it up first.
- `arena_pricing`: 64 / 100

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