The Context tab now replays the period's calls of each agent against the
settings that decide what they cost, and shows, per agent and per model,
the value that would have used the fewest tokens for how this user works:
Claude Code's auto-compact window per model (modelSettings.<model>.
autoCompactWindow), its main and subagent prompt cache lifetimes
(promptCacheTtl, subagentPromptCacheTtl: 5m or 1h), and Codex's
model_auto_compact_token_limit. Each row says where the value comes from
now (the agent's default, the user's own setting, one magpie set, or a
variable that comes first and locks it), why (how fast conversations grow,
what a compaction leaves, how long the user pauses), the cost curve, and
the saving. Nothing is written until "Use …" is clicked; what was there is
stashed and Undo puts it back, unless the user changed it since. A window
the user set past the model's own is shown capped, as Claude Code caps it
(min(setting, model window)), so no saving is claimed that wouldn't happen.
Advice under a 3% saving is "already the leanest".
On the owner's 7 days (88K Claude Code calls, 956 Codex): opus keeps 200K
(their 500K is capped to it), fable 5.1 200K → 160K saves 5% (2.56M
tokens), both cache lifetimes and Codex's 272K are already the leanest.
Run: go vet ./... and go test ./... pass (internal/tune, internal/agent
TestTune*: user-set values kept, env locks, undo after a user edit, TOML
key order). context-tune.test.cjs passes in Chromium and WebKit, en/zh/
zh-TW/ja/de, at 360 and 1100px (22); context-window, context-scroll-end
pass. Full GUI suite: library-servers-bulk and market-have failed once
under load and pass alone; market-have fails on origin/main 494dedcf too
(1 of 8 runs). Claude Code 2.1.296 in a sandbox config dir shows
"Auto-compact window for Fable 5.1: 160k tokens (from settings)" for the
written modelSettings key. The real-data advice was read from the owner's
own ~/.claude and ~/.codex, nothing written.
yetone
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