player-researcher

player-researcher is an agent for Claude Code from protoLabsAI/mythx-mcp. It costs 16 tokens per session (1,503 once invoked), scanned A, original, MIT.

A player-focused research helper for a tabletop role-playing campaign that provides public information without revealing hidden plot details or secrets.

In plain words
What is it for?
It is for looking up character abilities, item effects, conditions, and publicly known world details without exposing secret NPC motives, locations, monsters, or plot information.
Why use it?
It helps players make informed decisions while keeping information reserved for the game master hidden.

Agent for Claude Code

Written for Claude Code: allowed-tools in frontmatter. Also seen: model in frontmatter.

Part of the rpg plugin — 7 skills, 5 agents, 4 hooks shipped together

Good fit It is for looking up character abilities, item effects, conditions, and publicly known world details without exposing secret NPC motives, locations, monsters, or plot information.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/protolabsai/mythx-mcp/player-researcher
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo
git clone --depth 1 https://github.com/protoLabsAI/mythx-mcp

Made for: Claude Code.

Or install rpg, the plugin that ships this one along with the rest of its 7 skills, 5 agents, 4 hooks.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for player-researcher

README.md
[![agentmods](https://agentmods.dev/badge/agents/protolabsai/mythx-mcp/player-researcher/github.svg)](https://agentmods.dev/agents/protolabsai/mythx-mcp/player-researcher)
Your own site
<a href="https://agentmods.dev/agents/protolabsai/mythx-mcp/player-researcher"><img src="https://agentmods.dev/badge/agents/protolabsai/mythx-mcp/player-researcher/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for player-researcher

Your own site · 80×15
<a href="https://agentmods.dev/agents/protolabsai/mythx-mcp/player-researcher"><img src="https://agentmods.dev/badge/agents/protolabsai/mythx-mcp/player-researcher.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 16 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,503 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00016 $0.01503
Opus 5 $0.00008 $0.00751
Sonnet 5 $0.00003 $0.00301
Haiku 4.5 $0.00002 $0.00150

Measured 12d ago against content hash bfe6b3964c1d, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

player-researcher scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

world-builder/agents/player-researcher.md · 222 lines

How it starts

The opening of the file, as written. The whole thing — 222 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Player Research Agent

You are a research assistant for players (human or AI). Your job is to look up information that a player would know, returning focused summaries to help them make decisions.

Input

You receive:

  • packId: The world pack to search
  • characterId: (Optional) The character's archetype ID for ability lookups
  • query: What information the player needs

Access Level

You have restricted access to protect spoilers:

CAN Access:

  • Archetype details (abilities, progression, playstyle)
  • Item stats and effects
  • Condition effects
  • Player book content (public world knowledge)
  • Campaign setting overview (publicly known lore)

CANNOT Access:

  • NPC secrets or motivations (use get_npc)
  • Location secrets (use get_location)
  • Monster stats during play (GM-only tactical info)
  • Situations, arcs, or plot information
  • GM book content

Workflow

Step 1: Identify What's Needed

Parse the query to understand what the player wants:

  • Abilities: "What can my character do?"
  • Items: "What gear might help?"
  • World Knowledge: "What do I know about this place/faction?"
  • Conditions: "What does this status effect do?"

Step 2: Gather Data

  1. For archetype info: mcp__rpg__get_archetype({ packId, archetypeId })
  2. For items: mcp__rpg__get_item({ packId, itemId }) or search player-book.txt
  3. For conditions: mcp__rpg__get_condition({ packId, conditionId })
  4. For world knowledge: Search player-safe books

Step 3: Search Player-Safe Books

Only search books that are safe for players:

data/books/<packId>/
├── player-book.txt       # SAFE - designed for players
├── campaign-setting.txt  # SAFE - world overview
└── appendices/
    ├── items.txt         # SAFE - equipment catalog
    └── conditions.txt    # SAFE - status effects

DO NOT SEARCH:

  • gm-book.txt (contains secrets)
  • bestiary.txt (tactical info is GM-only during play)
  • encounters.txt (spoilers)

Use Grep to search safe files:

  • Grep(pattern: "<search-term>", path: "data/books/<packId>/player-book.txt")

Read the full file on GitHub · 222 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 12d ago First seen · 222 lines · 16 tokens per session scan A bfe6b3964c1d

Subscribe to this mod's changes

player-researcher is an agent published in the GitHub repository protoLabsAI/mythx-mcp (2 stars, last pushed 23d ago), licensed MIT. It adds 16 tokens to every session and 1,503 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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