Tracer

How it works

• Monitors product health signals including user frustration, frontend reliability, web performance, file processing, AI turns, and tool usage.
• Opens a durable investigation when it detects a real failure or meaningful change from the baseline.
• Gives the investigator an isolated Linux sandbox with the ThinkEx repository, a full development toolchain, and bounded access to PostHog, Cloudflare, GitHub, and the web.
• Produces an evidence-backed incident report and can open a tested, narrowly scoped draft pull request when the cause is in the code.

Cloudflare and agent stack

Technology	Why Tracer uses it
Cloudflare Workers	Runs the app and keeps models, telemetry, secrets, and privileged actions behind one trusted boundary.
Cloudflare Agents SDK	Adds stateful agents, scheduled checks, RPC, and live client synchronization.
Cloudflare Think	Provides the durable investigation loop: tools, memory, queued work, streaming, and recovery.
Durable Objects + SQLite	Persist each monitor and incident thread, including history, transcripts, and reports.
Workers AI	Runs the investigation model (@cf/moonshotai/kimi-k2.6) close to the Worker runtime.
Sandbox SDK + Cloudflare Containers	Gives every investigation an isolated Linux machine where it can inspect, edit, build, and test the real repository.
Cloudflare Observability	Records Tracer's own logs and traces for production debugging.

The investigation container never receives PostHog, Cloudflare, or GitHub credentials. Those remain Worker secrets and are only used by narrow server-side tools and actions.

Tools and integrations

Integration	Why Tracer uses it
PostHog API	Supplies live product evidence through bounded, read-only HogQL queries.
Cloudflare REST + GraphQL APIs	Correlate runtime errors and traffic with versions and deployments.
Firecrawl	Adds current public documentation and external context to investigations.
ThinkEx repository	Lets the agent verify telemetry findings against the code and run real checks.
GitHub API	Publishes a tested fix as a guarded draft PR without granting merge or deploy access.

Application stack

Technology	Why Tracer uses it
React, Base UI, Tailwind CSS, and Lucide	Build the monitoring and live-investigation interface.
Vite + Cloudflare Vite plugin	Build the frontend and Worker as one application.
AI SDK	Standardize model messages, streaming, and tool execution.
Zod	Validate every tool, action, and provider input at runtime.
TypeScript, Node.js, and pnpm	Provide one typed toolchain across the app and investigation container.
Vite+	Run repository checks and production builds.