# OmniRoute v3.8.40

- Product: OmniRoute (https://whatsnew.fyi/product/omniroute)
- Vendor: diegosouzapw
- Date: 2026-06-29
- Version: v3.8.40
- Original notes: https://github.com/diegosouzapw/OmniRoute/releases/tag/v3.8.40
- Permalink: https://whatsnew.fyi/product/omniroute/releases/v3.8.40

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

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- **added** — Add relevance extractive compression engine that scores sentences by term-overlap with user queries and greedily keeps the most relevant within a budget
- **added** — Add hard-budget compression mode that trims bodies to a token budget by ranking and dropping lowest-saliency sentences while preserving original order
- **added** — Add opt-in result memoization for deterministic compression engines to skip recompute on the hot path
- **added** — Extend X-OmniRoute-Compression response header to surface compression transparency annotation with token counts and rules applied
- **added** — Add saliency heatmap visualization in the compression studio to color tokens by saliency score
- **added** — Add composite-command splitter for RTK detection to recognize individual commands in chains like cd /x && git status
- **added** — Add omniroute_tool_search MCP tool for lexical keyword search over MCP tool names and descriptions
- **added** — Add opt-in RTK semantic command-output renderers that rewrite structured command output into compact forms
- **changed** — Extend X-OmniRoute-Compression header to append compression statistics while maintaining backward compatibility with existing parsers

##### [3.8.40] — TBD

_In development — bullets added per PR; finalized at release._

###### ✨ New Features

- **feat(compression): relevance extractive engine** — a new opt-in compression engine that scores each sentence by term-overlap (Jaccard) with the user's last query minus a length/boilerplate penalty, greedily keeps the most relevant within a budget, and reconstructs the original order. Pure-string, deterministic, ReDoS-safe (char-code tokenization, no `RegExp` over user input), fail-open, default off. Ideal for trimming long pasted RAG context / tool output to what's relevant. Sentences carrying real signal (digits/URLs/errors/code/paths) are never dropped; `overlapThreshold`/`budgetPercent`/`boilerplateWeight` are configurable. Tier-2 item of the compression feature-extraction roadmap (#7). ([#5289](https://github.com/diegosouzapw/OmniRoute/pull/5289))
- **feat(compression): hard-budget mode — compress to ≤ N tokens** — a deterministic post-pass (`targetTokens` / `targetRatio`, default unset → no-op) that trims a body to a token budget. It ranks sentences/lines by average `scoreToken` ascending and drops the lowest-saliency ones until the body fits (measured by the exact cl100k `countTextTokens`), preserving original order. Lines carrying real signal (digits, URLs, `Error:`-family, code fences, stack `at`-frames, multi-segment paths, `key=value`) are never dropped; the budget is distributed proportionally across messages so the total stays ≤ target; an unreachable target (all-preserved) surfaces a `validationWarnings` note instead of failing silently. Does NOT touch the `estimateCompressionTokens` budget-gate estimator. Tier-3 item of the compression feature-extraction roadmap (#17). ([#5288](https://github.com/diegosouzapw/OmniRoute/pull/5288), follow-up [#5291](https://github.com/diegosouzapw/OmniRoute/pull/5291))
- **feat(compression): result memoization for deterministic engines (opt-in)** — caches `(input, config) → result` for provably pure, stateless modes (`lite`/`standard`/`rtk` and stacked pipelines of `{lite,caveman,rtk}`) to skip recompute on the hot path. Opt-in via `memoizeCompressionResults` (default off → zero behavior change). Conservative opt-in whitelist (stateful `ccr`/`session-dedup` — which write the cross-request CCR store — and model-backed `ultra`/`aggressive`/`llmlingua` are never cached), principal-scoped (skipped without a principal, so no cross-principal body leak), and clone-on-store + clone-on-read. Tier-3 item of the compression feature-extraction roadmap (#21). ([#5286](https://github.com/diegosouzapw/OmniRoute/pull/5286))
- **feat(compression): inline transparency annotation** — surfaces `tokens=847→312; rules: filler×8, dedup×2` derived from existing compression stats. The `X-OmniRoute-Compression` response header is extended **append-only** (the `mode; source=X` prefix stays byte-identical, so existing header parsers don't break) and the compression studio cockpit shows a matching badge. Zero new computation — it aggregates the `rulesApplied`/`techniquesUsed` already on the stats. Tier-3 item of the compression feature-extraction roadmap (#18). ([#5284](https://github.com/diegosouzapw/OmniRoute/pull/5284))
- **feat(compression): saliency heatmap in the compression studio** — the preview studio can now color each token by saliency: `ultra` per-token `scoreToken` (0–1, green→red gradient) or universal kept/removed from the existing diff. A dry-run visualization behind a toggle (no cost on a normal preview; backward-compatible when off). Completes the visualization half of roadmap item #13 (the A/B comparison shipped in [#5080](https://github.com/diegosouzapw/OmniRoute/pull/5080)). ([#5285](https://github.com/diegosouzapw/OmniRoute/pull/5285))
- **feat(compression): composite-command splitter for RTK detection** — `cd /x && git status` now detects as `git-status` (previously the whole string was treated as one command and matched no filter). A quote-aware top-level tokenizer splits on

_[Truncated at 4000 characters — full notes: https://github.com/diegosouzapw/OmniRoute/releases/tag/v3.8.40]_