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Mercury Code 1.2.3 — Unstoppable Mercury

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@hotheadhacker hotheadhacker released this 08 Sep 17:30
· 5 commits to main since this release
v1.2.3
7d49b8c

The release where Mercury Code stops dying and starts telling the truth. The completion pipeline was rebuilt around a completion contract: every task ends in a verdict — a verified completion with evidence, or an honest pause that names its blocker and resumes. Tasks can no longer fake success, die silently, or loop forever.

Highlights

Completion contract

  • Every task end is classified (text-stop / steps-exhausted / interrupted / truncated / aborted) — budget exhaustion is a pause, never a fake "Task complete"
  • Evidence-gated completion: implementation tasks must run a build/test/typecheck before the completion banner is allowed
  • Honest banners: "Response delivered · no file changes" (git-verified), first-person pause messages, per-file change summary at completion

AUTO mode — no more manual plan/execute switching

  • Mercury Code's new default: read first, plan silently, implement immediately in one flow
  • Small/medium changes build without asking; large or consequential changes present a concise plan with a single confirmation (recommended option default-selected), then build without re-asking

The escalation harness — the agent makes things happen

When a model narrates instead of building, the agent escalates mechanically — none of it depends on the model's goodwill:

  1. Grounding — the agent executes a deterministic directory listing itself (no LLM) and injects it as verified state
  2. Forced action — via prepareStep, the first step of a guard round runs with toolChoice: 'required' and mutating tools only — narration is mechanically impossible on that step
  3. Provider rotation — guard rounds walk the fallback chain; a narration-locked model isn't the only worker
  4. Wake-up call — after a full failed cycle, the bound doubles (10 mechanical rounds total) with a blunt directive: "Your next response MUST begin with a mutating tool call. ZERO prose."

Reliability — compact-on-pressure + no imposed size limit

  • Memory pressure now compacts the conversation in place and continues (OpenCode's SessionCompaction practice) instead of aborting long builds
  • No Mercury-imposed output size limit — the model's native limit governs (32,768 ceiling); providers that reject a high max_tokens get an adaptive halving

Security hardening

  • SSRF guard: fetch_url and install_skill validate scheme + private ranges (DNS-resolved) on every redirect hop; 512 KB caps
  • Credential files (web-config.json, web-sessions.json) written 0600 and repaired on load
  • Random initial web password — no more hardcoded default from a public repo
  • Secret redaction — API keys masked in logs and command-output echoes
  • Shell blocklist — swapped-flag rm -fr variants added to the never-execute tier

Live TUI

  • Plan checklist — the update_plan tool maintains pending / ▶ active / ☑ done steps in the transcript
  • ask_user choice picker — now renders inside Mercury Code (previously invisible → hang) and owns the keyboard; Esc cancels safely
  • Thinking preview — model reasoning streams as a quoted preview instead of 52 seconds of dead air
  • Wheel scrolling — full-screen transcripts scroll with the trackpad via a filtered stdin proxy

Fixed

  • Yoga WASM "memory access out of bounds" crashes — ink patched (freed-node hygiene + <Static> identity dedup), shipped via patch-package
  • Duplicate-message render loop (~30 s cadence)
  • Scroll repair after long-session trims (/mc scroll-set was parsed as a NaN delta)
  • Prose questions no longer fight the narration guard; non-git dirs no longer false-claim "no file changes"
  • Mercury Cloud recovery error now says "run mercury cloud connect" instead of an opaque 401 loop
  • Chat-mode thinking indicator surfaces live provider/phase activity

Upgrade

npm install -g @cosmicstack/mercury-agent@1.2.3

No config changes required. New optional env vars: MERCURY_STALL_SOFT_MS, MERCURY_STALL_HARD_MS, MERCURY_ALLOW_PRIVATE_FETCH. patch-package ships as a runtime dependency — the bundled ink patch applies automatically on install.

Full changelog: https://github.com/cosmicstack-labs/mercury-agent/blob/main/CHANGELOG.md

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