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June 27, 2026 A busy day across the MCP server (0.20.4 → 0.20.9) and the Agent Panel (0.4.3 → 0.4.4): the headline is a self-healing queue/render watchdog, joined by color analysis, much more reliable custom-node installs, and a round of panel polish. The krea2 packs were also re-sliced from the new KREA 2 ULTRA V2 workflow.

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Queue/render wedge watchdog

The nastiest failure mode: a wedged high-res sampler step lets the agent stack jobs behind a zombie render it can’t see or kill. Three best-effort, fail-safe guards close it (if the watchdog WebSocket never opens, nothing changes):
  • panel_run backpressure — appends a QUEUE WARNING to the tool result when a render is already running, so the agent stops stacking behind it.
  • Passive QueueMonitor — a best-effort WS to ComfyUI tracks the running prompt / node / progress; a stuck step (the same progress value re-emitted) trips a one-line STALL/BACKLOG note prepended to the agent’s next turn, deduped per episode. Threshold via COMFYUI_MCP_STALL_S (default 180s, clamped 15–3600), and live-tunable from the panel’s Render stall warning (seconds) setting via a set_config frame — no reconnect needed.
  • cancel_job escalation — interrupt → verify it actually stopped (within COMFYUI_MCP_INTERRUPT_S, default 30s) → escalate to /free → report WEDGED and suggest restart_comfyui if it still won’t die. A new clear_pending drops all pending jobs in the same call.
See How it works → the queue/render watchdog.

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analyze_color — color stats without a vision round-trip

A new analyze_color tool returns palette / contrast / color statistics for a generated image — dominant colors, average + luminance stats, contrast checks — so the agent can reason about an image’s color without spending a vision turn on it.

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Custom-node installs: registry-first, with a hardened clone fallback

install_custom_node / apply_manifest used to pass the full git URL as the Manager’s id, but ComfyUI-Manager keys its node DB by repo-name / CNR id (never a URL), so the lookup matched nothing and the queue reported “done” without cloning — a false success. Installs are now:
  • Registry-first — git URLs are resolved the way the Manager UI does (repo name, nightly version, dev channel, cache mode).
  • Verified against /v2/customnode/installed (which reflects on-disk packs, so a freshly-installed node is seen before a reboot); a non-URL id that doesn’t install is reported as a hard failure, not a false success. apply_manifest applies the same verification.
  • Clone fallback — only when the Manager genuinely can’t resolve the pack (an unregistered repo) does it fall back to a direct git clone (+ best-effort pip install -r requirements.txt via the ComfyUI venv). The fallback now fails fast instead of hanging for minutes on a credential prompt — git network ops run non-interactively (GIT_TERMINAL_PROMPT=0 + GIT_ASKPASS) with a tightened 180s clone timeout.
The install path is also hardened against git-option injection (a URL starting with -) and path traversal (a repo name resolving outside custom_nodes): the URL is validated up front, every on-disk use is containment-checked, and git clone/checkout use --end-of-options. Separately, update_all now applies its mode (the Manager reads those params from the query string, where they’re now sent).

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Output discovery + correctness fixes

  • list_output_images now recurses into subfolders and lists videos, not just images. SaveVideo / VHS write to paths like output/video/clip_00001.mp4; those used to look “not found” on a flat scan. Each result carries its subfolder and a kind: "image" | "video", so you can pass { filename, subfolder } straight to stage_output_as_input / get_image. Verify a video render here, not via /history.
  • get_history (no prompt_id) returns the newest run. It now selects by ComfyUI’s monotonic queue number instead of object-iteration order, so it no longer lags one run behind — pass a prompt_id when naming a just-produced output.
  • “Send now” / interrupt no longer wedges the agent. The aborted turn’s result event now drives the turn-gate release at the right moment (with a bounded fallback), so an interrupt can never stop cold or run the gate ahead.

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Panel: onboarding, rich media, code blocks, stall warning

  • Provider onboarding. Connect-time readiness detection per provider (CLI on PATH + a login on disk; macOS Keychain handled). An onboarding card shows only when neither provider is signed in; the panel auto-switches to a ready provider when the saved pick isn’t usable (the saved preference is kept), and a not-ready row becomes a “set up” action. See Backends → readiness & onboarding.
  • Rich media metadata in agent pushes. A render’s executed-event note (and a structured metadata field) now carry each output’s path, file size, pixel dimensions, asset-set grouping (“output K of N from this run” + siblings, or “single output”), render duration, and completion time; video storyboards add format + real frame count/fps.
  • Code-block tools. Rendered fenced code blocks get a Copy button + a persisted global line-wrap toggle (off by default); inline code gets Copy.
  • Render-stall warning setting (General; default 180s, range 15–3600) — sent on connect and pushed live, so changing it applies without a reconnect.
  • Background-tab streaming fix. Streamed replies now render even when the ComfyUI tab is hidden — the reply commit finalizes synchronously in a background tab (and a visibilitychange handler flushes on hide / resumes the typewriter on return), instead of leaving an empty bubble with a stuck cursor that looked like the agent was “stuck thinking.”

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Krea 2 ULTRA V2 — detail boost + two-pass combo

Aitrepreneur shipped a V2 of the KREA 2 ULTRA workflow. The krea2 packs are re-sliced from it, with a new detail-boost node and a new two-pass combo pack. V2 adds the Krea2T-Enhancer node (capitan01R/ComfyUI-Krea2T-Enhancer), a MODEL→MODEL patch wired in the model path (Power Lora → Krea2T-Enhancer → sampler). It ships active in all three packs — bypass it to A/B against the un-boosted result. V2 also drops v1’s ConditioningKrea2Rebalance node entirely. A new pack, krea2-combo, runs a two-pass detail boost: a first pass (8 steps, er_sde, denoise 1) → VAE roundtrip → a low-denoise second pass (4 steps, euler, denoise 0.3), with the krea2 turbo LoRA @0.2 on both passes; it saves both passes so you can see the boost. The optional IdeoKrea LoRA (Aitrepreneur/IdeoKrea) — an Ideogram-4-style style/prompting LoRA — is downloaded but not wired by default; drop it into the Power Lora Loader’s empty slot (start ~0.5–1.0) for the turbo + IdeoKrea combo. The three packs:
  • krea2-txt2img-manual — prose prompt + detail boost.
  • krea2-txt2img-json — Ideogram-style JSON / area prompting + detail boost.
  • krea2-combo — two-pass detail-boost combo (turbo LoRA + optional IdeoKrea).
All are sliced from the V2 monolith and statically validated (clean slice + structural lint); the V2 detail-boost + combo are pending a live render once the Krea2T-Enhancer node and the turbo/IdeoKrea LoRAs are installed.