11 coding harnesses ship 380 tools, but only 124 are actually unique

yb2698 · x · 2026-10-07

To figure out how to improve coding harnesses, the author dissected the toolsets of 11 mainstream coding agents (opencode, pi, qwencode, kimi-code, codex, claude code, openhands, hermes agent, tau, deepseek harness, openclaw).

Key findings:

The 11 harnesses integrate 380 tool entries in total, but only 124 are unique after functional dedup;
Overlap was measured with a two-level "domain → job" taxonomy: e.g., the bash tool maps to a fine-grained job like shell.execution/run;
All harnesses except codex overlap with the larger set by at least 65%, revealing massive redundant implementations across the ecosystem;
The author concludes that most harnesses' capabilities (tools) could be centralized and shared instead of reimplemented.

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11 coding harnesses ship 380 tools, but only 124 are actually unique

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