Borrowing it
Nothing to install: this file belongs to marian-kamenistak/elc-toolkit. 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/marian-kamenistak/elc-toolkit/main/CLAUDE.mdgit clone --depth 1 https://github.com/marian-kamenistak/elc-toolkitWrote 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/marian-kamenistak/elc-toolkit/claude-md)<a href="https://agentmods.dev/instructions/marian-kamenistak/elc-toolkit/claude-md"><img src="https://agentmods.dev/badge/instructions/marian-kamenistak/elc-toolkit/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/marian-kamenistak/elc-toolkit/claude-md"><img src="https://agentmods.dev/badge/instructions/marian-kamenistak/elc-toolkit/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 | $0.00791 | $0.00791 |
| Opus 5 | $0.00396 | $0.00396 |
| Sonnet 5 | $0.00158 | $0.00158 |
| Haiku 4.5 | $0.00079 | $0.00079 |
Grade B, and why
elc-toolkit CLAUDE.md scanned grade B with 2 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.
Sends data to an external URLmediumData exfiltration
A POST to an outside endpoint may be telemetry or may be exfiltration; either way the mod talks to somewhere, and you should know where.
- [ ] `curl -s -X POST https://www.engineeringleaders.io/mcp -H 'content-type: application/json' -H 'accept: application/json, text/event-stream' -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'` returns **5** — the 5 Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
- [ ] `curl -s -X POST https://www.engineeringleaders.io/mcp -H 'content-type: application/json' -H 'accept: application/json, text/event-stream' -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'` returns **5** — the 5 How it starts
The opening of the file, as written. The whole thing — 46 lines — stays where its author put it; the contents beside it link to each section on GitHub.
elc-toolkit
What this is
Remote, authless MCP server for the elc stream, live at https://www.engineeringleaders.io/mcp
(docs page at the same URL in a browser; human page at /toolkit/). Five tools: get_started
(routes a greeting/test/unclear message to the right tool below), get_more_tools (a real
registration, 2026-09-04 — overrides @posthog/mcp's auto-injected virtual tool of the same
name so a bare "hi"/"test"/"hello" ping gets the get_started menu instead of a canned "we
noted your feedback" dead end; a real capability report still falls through unchanged) plus
three backed by ELC's own member data — benchmark_leadership_ratio,
build_partnership_business_case, assess_community_launch_readiness. Listed in registries
(server.json, mcp.json).
Stack
- Cloudflare Worker + Durable Object
ElcToolkit(MCP_OBJECT),McpAgentfromagents^0.17, streamable HTTP - TypeScript 6, zod 4,
@posthog/mcp+posthog-nodefor usage analytics - wrangler ^4.105, npm
- Routes:
engineeringleaders.io/mcp*+www.— owns the/mcp*prefix;elc-partnership-buildernests under/mcp/partnership*
Run / build / deploy / test
# dev: npm run dev
# build: npm run type-check
# test: none — no test script; use /ai-mcp-test for persona runs
# deploy: set -a && source ~/.env && set +a && npm run deploy
Sources of truth
| Data | Lives in | Id / path |
|---|---|---|
| Peer baseline numbers | ELC Data Points (Notion) via Attio elc_members |
fetch: node ~/ai/_brand/data-points/dp.mjs |
| New-city playbook | business/elc/playbooks/meetup-new-city.md |
|
| Registry metadata | server.json, mcp.json, LAUNCH-STATUS.md |
|
| Secrets | Worker-only, no .op-secrets: MCP_USAGE_SLACK_CHANNEL, SLACK_BOT_TOKEN_ELC (wrangler secret list, 2026-08-30) |
PostHog key is not a secret — public posthogKey: "phc_…" literal in src/index.ts |
Definition of done
-
npm run type-checkexits 0 -
wrangler deployexits 0 -
curl -s -X POST https://www.engineeringleaders.io/mcp -H 'content-type: application/json' -H 'accept: application/json, text/event-stream' -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'returns 5 — the 5 tools above,get_more_toolsincluded exactly once -
GET https://www.engineeringleaders.io/mcp(browser Accept) returns 200 HTML docs page -
wrangler tail --format jsonfor 60s: zeroconsole.error, zero exceptions - Route precedence unchanged:
/mcp/partnershipstill lands onelc-partnership-builder
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 Changed · +5 lines · +117 tokens per session a1036a286e9c
- 10d ago First seen · 41 lines · 674 tokens per session scan B 3c099d033b27
elc-toolkit CLAUDE.md is an instructions file published in the GitHub repository marian-kamenistak/elc-toolkit (0 stars, last pushed 5d ago), licensed MIT. It adds 791 tokens to every session, about $0.0040 per session on Opus 5. A static security scan graded it B with 2 findings (sends data to an external url, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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