Code Limit: Copilot Analytics
Real-Time Token Monitoring & Proxy Analytics for AI Coding Assistants
Role
Design & Full-Stack Development
Client
Developer Tools
Duration
1 month
Team
Studio Team (Full-Stack & Systems)
Key Impact
Provides 100% real-time visibility into AI token consumption, preventing unexpected token exhaustion and quota leaks.
Project Overview
Engineered to eliminate the visibility blind spots in AI-assisted developer terminals, Code Limit combines an ultra-low latency proxy server with an interactive web telemetry dashboard. By intercepting streaming requests and calculating exact tiktoken metrics on the fly, developers and technical teams can monitor token consumption, project costs, and prevent infinite AI loops.
Technical Challenges
- 1Accurately counting tokens from chunked Server-Sent Events (SSE) streams without buffering or delaying the developer's terminal responses.
- 2Secure multi-account credential management across local environments.
Engineered Solutions
- 1Created a custom stream-tap proxy using Tiktoken that parses streaming tokens with under 2ms overhead.
- 2Implemented encrypted local vault storage and OAuth 2.0 Device Authorization flow.
Interface Artifacts
“Code Limit gives engineering teams peace of mind. We can see token consumption in real time and eliminate surprise API bills.”
Key Features Shipped
- Real-Time RPM / TPM Telemetry Dashboard
- Multi-Account Profile Switcher (CLI + Web)
- Stream-Tap Token Counter (tiktoken)
- Automated Cost Estimation & Quota Alerts
- Historical Analytics (1h, 24h, 7d, 30d)
- Dark-Mode Linear Styled Analytics Interface
Engineering & Delivery Timeline
Week 1: Research & Network Protocol
1 weekAnalysis of Copilot CLI communication, SSE stream chunking, and proxy middleware architecture.
Week 2: Core Proxy & Tiktoken Engine
1 weekNode.js streaming proxy server, zero-buffer tiktoken calculation, and Supabase telemetry logging.
Week 3: Telemetry Dashboard UI
1 weekNext.js analytics dashboard with Recharts, real-time SWR polling, and RPM/TPM gauges.
Week 4: CLI Auth Vault & Deployment
1 weekOAuth 2.0 Device Flow implementation, terminal profile switcher, and Vercel cloud deploy.
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