AgentFirstStack Replay

AgentFirstStack

Analytics, tag management, email inboxes and session replay that an AI agent sets up by itself.

No signup form, no verification email, no dashboard to click through. Free to use, and open source.

agentfirststack.com · Manual · Self-host · Architecture

Every new website needs the same infrastructure: analytics, a tag manager with conversion tracking, and an email address to sign up for everything else. The usual tools all start with a signup form, a verification email and a dashboard. Coding agents can't get past those steps alone.

AgentFirstStack is that infrastructure, rebuilt so an agent can do the whole job:

• One request gets an account. POST /v1/signup returns a key that works on every service.
• Everything is an API call and an MCP tool. Nothing is hidden behind a settings page.
• The manual is a text file. Each service serves /llms.txt with every endpoint, tool and field.
• Every step can be verified. The agent checks its own work instead of guessing.
• Humans optional. When it's done, the agent hands its person a claim link. They sign in with Google to see the project's analytics, tags, replay and mail in a dashboard, manage keys and teammates, connect Claude or ChatGPT over OAuth, and delete the project. We email them about their projects, and alert them when a site stops sending data, gets suspicious traffic (one network over its share or a sudden flood is set aside, out of reports and budgets, for review), or a project gets close to a fair-use limit (docs/accounts.md).

Services

Quick start

Hosted (free)

Copy the prompt from agentfirststack.com into Claude Code, Cursor, Codex or any agent that can make HTTP requests. The agent follows the full setup in one run: it maps your site's pages, main actions and the tools it uses now, then asks you once where the inbox's email should go and whether to bring your old tools' setup and history over. It creates an inbox, sets up analytics (goals, AI crawler visits reported from your server, a weekly report for you, and the history of GA4, Plausible or whatever you used before), a tag container with an event for each main action (starting from your GTM container, if you have one), and replay; then it deploys, verifies each part as a visitor with test traffic (POST /v1/setup/test: a test email, test events through analytics, tags and each ad platform's test mode, then a browser test visit), runs the setup check (GET /v1/setup) until nothing is missing, writes what it did to AGENTFIRSTSTACK.md (and a short block to AGENTS.md, so later sessions with any agent pick up new features), and shows you a table of what's set up and what passed, with a claim link. Your old tools stay until the setup check says the numbers match and you agree to remove them. Pasting the same prompt again later starts from the setup check and fills the gaps.

Or do it by hand:

curl -X POST https://agentfirststack.com/v1/signup

{ "api_key": "afs_...", "mcp": { ... }, "next_steps": [ ... ] }

curl -X POST https://analytics.agentfirststack.com/v1/sites \ -H "Authorization: Bearer $AGENTFIRSTSTACK_API_KEY" -H 'content-type: application/json' \ -d '{"domain":"example.com"}'

Add one MCP server for every service (tools prefixed analytics_, tags_, mail_, replay_):

claude mcp add --transport http afs https://agentfirststack.com/mcp --header "Authorization: Bearer $AGENTFIRSTSTACK_API_KEY"

Or one per service:

claude mcp add --transport http afs-analytics https://analytics.agentfirststack.com/mcp --header "Authorization: Bearer $AGENTFIRSTSTACK_API_KEY"

claude mcp add --transport http afs-tags https://tags.agentfirststack.com/mcp --header "Authorization: Bearer $AGENTFIRSTSTACK_API_KEY" claude mcp add --transport http afs-mail https://mail.agentfirststack.com/mcp --header "Authorization: Bearer $AGENTFIRSTSTACK_API_KEY" claude mcp add --transport http afs-replay https://replay.agentfirststack.com/mcp --header "Authorization: Bearer $AGENTFIRSTSTACK_API_KEY"

The hosted version has fair-use limits, listed in the manual.

Self-hosted

Everything runs on Cloudflare Workers in your own account:

git clone https://github.com/StartGlobal-AI/agentfirststack && cd agentfirststack

pnpm install pnpm afs init mystack --domain example.com --account pnpm afs deploy mystack CLOUDFLARE_API_TOKEN=... pnpm afs email mystack # inbound + outbound mail pnpm afs check mystack

See docs/self-hosting.md for requirements, signup modes, limits and updates.

How it's built

TypeScript on Cloudflare Workers with Hono and zod. Storage:

• D1: configuration and the shared identity database.
• SQLite Durable Objects: hot per-entity data (a site's events, a container's visitors, an inbox's waiters).
• R2: mail blobs and replay recording chunks.
• Queues: retried delivery to ad platforms and webhooks.
• Email Routing and Email Sending: mail in and out.

site/        landing page, manual, signup, MCP gateway, dashboard agentfirststack.com

analytics/ web analytics analytics.agentfirststack.com tags/ tag manager + conversion APIs tags.agentfirststack.com mail/ inboxes, sending, domains, webhooks mail.agentfirststack.com replay/ session replay, signals, heatmaps, share player replay.agentfirststack.com shared/ @afs/shared: auth, signup, errors, MCP handler scripts/ pnpm afs: the deployment tool deploy/ deployment profiles (yours; the agentfirststack.com one is kept private) docs/ architecture, self-hosting, operations, development

More in docs/architecture.md.

Development

pnpm install

pnpm typecheck && pnpm test # every package; integration tests run inside workerd cd mail && pnpm db:migrate:local && pnpm dev

docs/development.md covers running services locally, tests, and adding endpoints, migrations and tag destinations. docs/operations.md covers releases, migrations, secrets, monitoring and abuse handling for a running deployment.

Contributing

Issues and pull requests are welcome. Read CONTRIBUTING.md first; it's short. Report security issues privately as described in SECURITY.md.

License

The services are AGPL-3.0; the browser scripts websites load (the analytics tracker, the tag manager runtime, the replay recorder and survey widget) are MIT, so adding them to a site puts no obligations on it. Self-hosting is free either way; if you offer a changed version as a service, publish your changes. Details: LICENSING.md. Built and hosted by StartGlobal.