Borrowing it
Nothing to install: this file belongs to sbenson2/GameLens. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/sbenson2/GameLens/main/CLAUDE.mdgit clone --depth 1 https://github.com/sbenson2/GameLensWrote 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.
[](https://agentmods.dev/instructions/sbenson2/gamelens/claude-md)<a href="https://agentmods.dev/instructions/sbenson2/gamelens/claude-md"><img src="https://agentmods.dev/badge/instructions/sbenson2/gamelens/claude-md/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.
<a href="https://agentmods.dev/instructions/sbenson2/gamelens/claude-md"><img src="https://agentmods.dev/badge/instructions/sbenson2/gamelens/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 5.5 | $0.00537 | $0.00537 |
| Sonnet 5.5 | $0.00269 | $0.00269 |
| Haiku 4.5 | $0.00134 | $0.00134 |
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 2mo 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.
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— paramssituation?/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,sectionextracts 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 MCPisError. - 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}) viasrc/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 withGAMELENS_ANALYTICS=false). - CLI:
gamelens(serve) /gamelens init(write MCP config) /gamelens status. - Runtime deps:
@modelcontextprotocol/sdk,zod— nothing else.
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.
- 2mo ago First seen · 104 lines · 1,343 tokens per session scan A e15286924b34
GameLens CLAUDE.md is an instructions file published in the GitHub repository sbenson2/GameLens (1 stars, last pushed 3mo ago), licensed MIT. It adds 1,343 tokens to every session, about $0.0054 per session on Opus 5.5. 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.
GameLens CLAUDE.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| GameLens CLAUDE.mdsbenson2/GameLens | Instructions file | 1 | 3mo ago | MIT | A | 1,343 | Claude Code |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 9,719 | GitHub Copilot |
| next.js AGENTS.mdvercel/next.js | Instructions file | 143k | yesterday | MIT | A | 7,461 | Codex, OpenCode |
| langchain AGENTS.mdlangchain-ai/langchain | Instructions file | 149k | yesterday | MIT | A | 4,680 | Codex, OpenCode |
| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 5,516 | GitHub Copilot |
| vscode copilot-instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 3,093 | GitHub Copilot |
| deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness | Instructions file | 274k | 2d ago | MIT | A | 4,313 | Codex, OpenCode |