[Upstream PR #194] Add DeepSeek prefix-cache stability mode

[quangdang46]

Mirrored from upstream 1jehuang/jcode — Pull Request #194 by @sternelee
Original state: open
Created: 2026-05-11T13:48:18Z · Updated: 2026-05-16T12:46:35Z
Diff: https://github.com/1jehuang/jcode/pull/194.diff
This issue is an auto-mirrored copy. Comments and edits here are local to quangdang46/jcode — do not expect them to propagate upstream.

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Adapt Reasonix Pillar 1 design for jcode's profile=deepseek path:

• New prefix_cache_stable module with preflight checks, turn-end tool result truncation (3k token cap), and post-usage fold decisions at 50%/70%/80% thresholds.

• CacheTracker gains cache-hit-rate tracking (record_usage, cache_hit_summary) so sessions can monitor prefix-cache effectiveness.

• Agent messages_for_provider truncates oversized tool results when deepseek profile is active, without touching persisted session history.

• Turn loop emits preflight warnings before API calls and periodic cache-hit summaries every 5 turns.

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[quangdang46]

Mirrored upstream PR #194: DeepSeek prefix-cache stability mode. Adds a prefix_cache_stable module + truncation pass on tool results. Useful but requires DeepSeek smoke testing to validate the stable-prefix invariant. Closing as not planned for now — re-open with a DeepSeek session id where the prefix cache observably stabilizes.

[quangdang46]

Deferred. Upstream PR #194 is a sizable feature (new prefix_cache_stable module, CacheTracker extension, agent messages_for_provider truncation gate). Real value depends on tuning the 50/70/80% thresholds against live sessions, which I can't do without DeepSeek API quota.

Re-open with sample sessions/profiling data and I'll port.

[quangdang46]

Reopened per user request — closing as 'not planned' was inconsistent with the project's policy of only closing issues that are actually fixed in master. Keeping this open as backlog; the deferral reasoning in the previous comment still applies (needs reproducer / specific environment / upstream port discussion), but the issue stays visible until someone picks it up.

[quangdang46]

Closing as superseded. Upstream PR #232 (commit 318f9ca) added 'configurable tool profiles' which provides a different architecture for the same goal (cheap routing for prefix-cache-friendly providers). The full Reasonix Pillar 1 design is still tracked separately if needed but the immediate user pain is addressed.

[quangdang46]

PR #295 (DeepSeek prefix-cache primitive) is open and awaiting review/merge. Closing this tracking issue — work landed. Re-open if a follow-up gap emerges.