After one too many surprise Claude Code bills, I built agentwatch.
It's a local HTTP proxy written in Rust. Point your agent at localhost:7878, and it intercepts every request, parses the token usage, and shows a live Ratatui TUI dashboard of what you're spending — in real time.
Everything stays local. SQLite database, zero signup, single binary via cargo install agentwatch.
Supports Claude Code, Codex, and Gemini CLI.
github.com/zaydmulani09/agentwatch
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source & further reading
dev.to — original article
Your AI agent says "done." Who checks that from outside the agent?
Building a Practical Taxonomy for AI World Models
I put a firewall in front of my AI agents. Here is the near-miss that made me build it.