Ace Sidecar – Efficiency Optimization for Local AI Coding
ACE Engineering announced the ACE sidecar, a local reverse proxy that adds observability to coding-agent sessions by tracking costs, token usage, and performance metrics. The tool runs entirely on the user’s machine, does not upload any data, and is available in beta. It provides a dashboard that highlights token duplication, cache savings, and potential optimization levers for developers.
- ▪In a test of Claude Code sessions, the sidecar recorded 4.2 billion prompt tokens costing $3,035 at list price, with 90.5% of tokens being repeated input.
- ▪The dashboard shows that cache reads account for roughly 98% of prompt volume and that cache savings can be 6.1 times the raw bill.
- ▪The sidecar operates as a local reverse proxy, relaying traffic unchanged while pricing each request and displaying metrics at 127.0.0.1 without requiring an account or data upload.
- ▪Optimization levers are presented with risk assessments, indicating that some cost‑saving actions may not reduce token usage despite lowering expenses.
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| Original publisher | Acefleet |
| Canonical URL | https://acefleet.dev/blog/announcing-the-ace-sidecar |
| Publication time | Sat, 01 Aug 2026 04:08:03 +0000 |
| Retrieval time | 2026-08-01T04:23:20.359Z |
| Last seen | 2026-08-01T04:23:20.359Z |
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← /blogJul 30, 2026· ACE Engineering#product-launch #sidecar #coding-agents #claude-code #observability #cost #telemetry #news #roadmap #managed-api-stackAnnouncing the ACE sidecar: observability for coding-agent sessionsA local proxy that sits in front of your coding agent and tells you what each session actually cost, where the time went, and which optimisations would be worth anything on your traffic. Runs on your machine, uploads nothing. Beta opening now.Announcing the ACE sidecar Coding agents are the least observable expensive thing most engineering orgs now run. You know your monthly API bill.
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Excerpt limited to ~120 words for fair-use compliance. The full article is at Acefleet.
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