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v0.5.0 — Token compression at the gateway seam

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@revitteth revitteth released this 01 Jul 11:00
v0.5.0
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revitteth Max Revitt
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Learn about vigilant mode.

v0.5.0 — Token compression at the gateway seam

MCPlexer now compresses the tokens it feeds into your agent's context — measured first, applied only when proven safe.

Highlights

Token compression (measure-first, zero-config)

MCPlexer compresses downstream MCP tool-result payloads before they reach the model. It auto-wires into a dry-run (shadow) mode on upgrade: it measures what each transform would save on your real traffic and returns results byte-identical — zero accuracy or latency risk — until you turn a transform on from the dashboard.

  • Dashboard settings page (/settings/compression): a three-state mode (off / dry-run / on), a per-transform toggle, and each transform's observed savings shown next to it, with a gate-verified badge for transforms proven safe.
  • Four transforms:
    • json_minify — strip insignificant JSON whitespace (value-lossless).
    • structured_dedup — drop the double-encoded content text when structuredContent already carries the value.
    • log_compact — drop low-severity INFO/DEBUG log noise, keep errors + stack traces + load-bearing tokens.
    • oversize_truncate — head + tail for very large payloads.
  • Reversible by design (CCR): any dropped content is stashed and expandable on demand via the new mcpx__retrieve tool. A verify-after-compress kill-switch guarantees the model never sees a marker it can't expand.
  • Measured, not asserted: the first tokenizer in the codebase + a durable savings ledger + a REST API power the dashboard. A CI gimmick gate enforces value-losslessness, credential safety, a latency budget, and a real measured win for every transform.

Also in this release

  • Audit live-stream filter parity — the live tail now filters identically to the historical feed across all facets.
  • macOS install — release binaries are re-signed + de-quarantined so the installed binary runs cleanly.
  • Tasks — honest open-count + bulk move-to-workspace.

Good to know

  • The compression seam sees MCP tool results + execute_code output; native harness Bash/Read/Grep bypass the gateway. Budget 15–35% on mixed MCP traffic.
  • Default is dry-run — nothing is compressed until you opt a transform in from the dashboard.
  • Pure Go, no CGO, single static binary — the ML/sidecar path was deliberately left out to preserve that.

Full changes: v0.4.0...v0.5.0

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