What is GameLens CLAUDE.md?

Project instructions for GameLens, a game-design guidance server for programmers, covering its monorepo structure, commands, server, and design-document rules. A monorepo is one repository containing multiple related packages.

They are for developing the GameLens server and its site, installing dependencies, building the project, running it in development, and following its design-content specification.

They tell a coding agent how this project is organized and which commands and rules to follow, reducing mistakes when changing or running it.

GameLens CLAUDE.md — Instructions file for coding agents by sbenson2: Project instructions for GameLens, a game-design guidance server for…

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.

agentmods

npx agentmods add instructions/sbenson2/gamelens/claude-md

Clone the repo

git clone --depth 1 https://github.com/sbenson2/GameLens

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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/sbenson2/gamelens/claude-md.svg)](https://agentmods.dev/instructions/sbenson2/gamelens/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/sbenson2/gamelens/claude-md"><img src="https://agentmods.dev/badge/instructions/sbenson2/gamelens/claude-md.svg" alt="Measured on agentmods" height="20"></a>

Per session 1,343 This file is loaded in full into every session.

When invoked 1,343 The same file — it is already loaded in full.

Security scan A 0 findings. Scan, not verified.

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.

Model	Per session	Once invoked
Fable 5.1	$0.01343	$0.01343
Opus 5	$0.00672	$0.00672
Sonnet 5	$0.00269	$0.00269
Haiku 4.5	$0.00134	$0.00134

Measured 5d ago against content hash e15286924b34, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-05, from the pricing page.

Security

Grade A, and why

GameLens CLAUDE.md 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 5d 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.

CLAUDE.md · 104 lines

How it starts

The opening of the file, as written. The whole thing — 104 lines — stays where its author put it; the contents beside it link to each section on GitHub.

GameLens Monorepo

A game designer AI lens for programmers. Free and open source MCP server, MIT licensed. One tool (lens) + a curated design-doc knowledge base as MCP resources. Design philosophy only — no engine docs.

v3.0.0 (2026-08-05): renamed from GameCodex (gamecodex on npm) and went design-philosophy-only — the 29 engine-doc modules (~950 docs), the module system (GAMEDEV_MODULES), and engine detection were removed; that content lives in the 2.x tags. v2.0.0 (2026-08-03) was the single-tool rewrite; v1.0.1 was the final release of the old five-tool surface. Repo lives at ~/Developer/GameCodex (dir rename to GameLens pending).

Monorepo Structure

GameLens/
├── packages/
│   ├── server/    <- the MCP server (the product) — SPEC.md is the source of truth
│   └── site/      <- marketing site (Next.js) — STALE: predates the lens direction
├── package.json   <- npm workspaces root
└── CLAUDE.md      <- This file

Commands (run from root)

npm install            # install all workspace deps
npm run build          # build server (clean dist + tsc)
npm run dev            # server watch mode
npm start              # start MCP server
npm run typecheck      # tsc --noEmit on server
npm test               # run all tests

Server (`packages/server/`)

The one tool: src/tools/lens.ts — params situation? / lens? / doc? / section?, no action routing. Situation → matched lenses + top matching KB docs; lens id → that lens; doc id → the doc (TOC-gated over 25KB, section extracts one heading); nothing → catalog. Precedence: doc > lens > situation.
Doc search: src/core/search.ts — TF-IDF engine (synonyms, stemming, title boosts; zero deps) indexed over the design docs at startup, powering the in-lens knowledge-base block.
Lens library: src/core/lenses.ts — 15 lenses (Cerny, MDA, Meier, Swink, juice, flow/Celeste, Fan, kishōtenketsu, core loops, Yu, Valve/RITE, SDT/Bartle, Sirlin/Schreiber, Koster, BotW emergence) + matchLenses/ findLens. Pure data + pure functions, fully tested.
Registry: src/tool-registry.ts — concurrency cap, analytics, never-throw with MCP isError.
Knowledge base: docs/ — ~10 curated game-design docs (genre reference, game feel craft, fundamentals, emergent/puzzle design, level design, postmortems, difficulty & accessibility, resource maps) served as MCP resources (gamelens://docs/{id}) via src/core/docs.ts. Design content only — engine/implementation content is out of scope.
Analytics: src/analytics.ts — local-only daily JSON aggregates (~/.gamelens/analytics/, disable with GAMELENS_ANALYTICS=false).
CLI: gamelens (serve) / gamelens init (write MCP config) / gamelens status.
Runtime deps: @modelcontextprotocol/sdk, zod — nothing else.

Read the full file on GitHub · 104 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.

5d ago First seen · 104 lines · 1,343 tokens per session scan A e15286924b34

Subscribe to this mod's changes

GameLens CLAUDE.md is an instructions file published in the GitHub repository sbenson2/GameLens (1 stars, last pushed 1mo ago), licensed MIT. It adds 1,343 tokens to every session, about $0.0067 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.

Game development

GameLens CLAUDE.md

Getting it into your agent

Wrote this? Show the measurements

What it costs to keep this loaded

Grade A, and why

Nothing flagged

How it starts

GameLens Monorepo

Monorepo Structure

Commands (run from root)

Server (`packages/server/`)

What this file has done since we first saw it

Other instructions, from other repositories

claudemon CLAUDE.md

unity-code-style-guide AGENTS.md

nes-php-glfw copilot-instructions.md

game-and-watch-retro-go-sd CLAUDE.md

base-building-trap-defense-design-agent-skill CLAUDE.md

trident-mcp AGENTS.md

GameLens CLAUDE.md

Getting it into your agent

Wrote this? Show the measurements

What it costs to keep this loaded

Grade A, and why

Nothing flagged

How it starts

GameLens Monorepo

Monorepo Structure

Commands (run from root)

Server (packages/server/)

What this file has done since we first saw it

Other instructions, from other repositories

claudemon CLAUDE.md

unity-code-style-guide AGENTS.md

nes-php-glfw copilot-instructions.md

game-and-watch-retro-go-sd CLAUDE.md

base-building-trap-defense-design-agent-skill CLAUDE.md

trident-mcp AGENTS.md

Server (`packages/server/`)