feat(composer): context window selector follows native defaults, adds custom window - #318
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… custom window
Claude models now default the Context Window option to their native window
(200k for Sonnet 4.6 / Opus 4.6, 1M for Fable 5/5.1, Opus 5, Sonnet 5,
Opus 4.7/4.8; the latter two gain the option). Selecting the default emits no
launch flags; a smaller window is passed as `--settings {"autoCompactWindow":N}`
and `[1m]` is only appended to expand a native-200k model.
The picker gains a Custom row with an inline input (500k / 500000 / 500,
100k–1M). Changing the window while the provider is live restarts it before
the next turn and records a `ContextWindowChanged` timeline divider under the
user message. The composer's context meter is clamped to the selected window.
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Summary
contextWindowoption defaults to the model's native window (200k: Sonnet 4.6 / Opus 4.6; 1M: Fable 5 / 5.1, Opus 5, Sonnet 5, Opus 4.7 / 4.8 — the last two gain the option).--settings {"autoCompactWindow":N};[1m]is only appended to expand a native-200k model.500k,500000,500; 100k–1M, inline validation error).ContextWindowChangeddivider ("Context window set to 200k") directly under the user message. Not emitted for the first message of a conversation or an idle session.Verification
cargo fmt --all --check,cargo clippy --workspace --all-targets -- -D warnings,cargo test --workspacepass locally.TCODE_DATA_DIR: Opus 5 shows1Mby default; entering500klaunchesclaude --model claude-opus-5 --settings {"autoCompactWindow":500000}(no[1m]); switching to 200k mid-session relaunches withautoCompactWindow: 200000and renders the divider under the second user message.