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Why send whole page when few token do trick

A token-efficient alternative to Playwright MCP for coding agents. One Go binary attaches to the Chrome you already run, reads the real accessibility tree, compresses it, and exposes four tools that cost 297 tokens of catalog — versus 3,422 for Playwright MCP and 4,507 for Chrome DevTools MCP, measured 2026-08-14. Originals stay byte-exact recoverable through CCR.

Capability ledger

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  1. 01297-token tool catalog (4 tools) vs 3,422 (Playwright MCP 0.0.79) and 4,507 (Chrome DevTools MCP 1.7.0)
  2. 02Focused query on a 200-row page ≈98 tokens instead of a full ARIA dump
  3. 03Byte-exact recovery of the original accessibility tree via the CCR store
  4. 04One static Go binary + your own Chrome — no bundled Chromium
  5. 05Honest benchmarks, losses included: the action-heavy checkout pilot cost more than both alternatives
  6. 06Token counts are offline o200k_base measurements labeled inferred, never verified savings

Product ledger

02
Language
Go
License
BSL-1.1

Product index

08
01Caveman SkillThe MIT skill: output compression for Claude Code & 30+ agents.Compression / live02Caveman ProxyRecoverable local context compression for agents you already use.Compression / live03Caveman Agent SDKTypeScript controls for what each agent run can spend and what its context costs.Agent toolkit / live04CaveGemmaCaveman compression baked into Gemma's weights.Compression / live05Caveman CloudThe byte-safe LLM gateway.Cloud / in development06Caveman CodeTerminal coding agent. Half the tokens.Agent toolkit / live07CavememPersistent memory your agents recall over MCP.Agent toolkit / live08CavekitCompressed, spec-driven development.Agent toolkit / live