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Overlay Apps · sonichi | DecimalAI

codingby sonichi

Overlay Apps

sonichi/overlay-apps

Source sonichi/sutando ↗License MIT

Framework + minimal example for Sutando desktop overlay applications — always-on-top, frameless Electron windows that float over the desktop, controllable from the Sutando web UI's /overlays manager. Ships one example overlay (System Resources). Add new overlays by registering them in app/main.js.

SkillScore100Maintained

Automatic

Coding pack

Last verified 8/23/2026

What it changes

Passed 22 of 22 test cases with the skill, and 8 of 22 without it.

Without skill36%

With skill100%

Checks it passed that the model alone missed

The endpoint path is /overlays
The example overlay is System Resources
The control server base port starts at 7849

and 19 more in the full report

14 fixed8 passed either way0 still failing0 broke

Pass-rate lift: +64 pp
Tokens: -19%
Agent turns: 0%
Response time: -71%

Model gemini-3.6-flashMeasured 8/23/2026v222 of 22 cases passed with skill

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/sonichi-overlay-apps/SKILL.md https://app.decimal.ai/s/sonichi-overlay-apps/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add sonichi-overlay-apps, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/sonichi-overlay-apps/ and pins it in .decimal/skills.lock

decimalai skills add sonichi-overlay-apps

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/sonichi-overlay-apps/SKILL.md https://app.decimal.ai/s/sonichi-overlay-apps/SKILL.md

Raw file: /s/sonichi-overlay-apps/SKILL.md ↗ · machine-readable summary at /s/sonichi-overlay-apps.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 14 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 14

Prompt

What HTTP endpoint path and method lists all registered overlays along with their active window state and bounding dimensions?

What was checked, without and with the skill
Checked	Without skill	With skill
The endpoint path is /overlays	Missed	Passed
The HTTP method is GET	Passed	Passed

case-15 · gemini-3.6-flash · 8/23/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md88 lines2 filesincludes scripts

Overlay Apps

A small framework for Sutando desktop overlays: always-on-top, frameless, transparent Electron windows that float over whatever you're working on, controllable from the web UI's /overlays manager view.

The framework gives you, for free:

A localhost control server the web UI manager talks to (open / close / show / hide / opacity / always-on-top).
Multi-display placement — move every overlay to a chosen monitor; the choice persists across restarts.
Auto-dim on app blur — overlays fade to ~20% opacity when you click into another app, restore to their configured opacity when you click an overlay back.
A simple OVERLAYS registry — add a new overlay by registering it.

When to use

Building or running a Sutando desktop overlay — an always-on-top, frameless floating window controllable from the web UI /overlays manager. Use this framework (register in the OVERLAYS registry) rather than hand-rolling an Electron window. Not for normal app windows or the menu-bar app.

Done & failure modes

Done = the overlay appears always-on-top and the /overlays manager can open/close/show/hide/opacity it; placement persists across restarts.
Control server port already in use → another overlay-apps instance is running; stop it first.
Overlay invisible → check it was registered in app/main.js OVERLAYS and that scripts/launch.sh synced source → workspace + installed deps.

Ships with

One example overlay: System Resources — live CPU / memory / disk / network / load (Cmd+Shift+S). The framework is overlay-agnostic; the example is just a working starting point.

Layout — workspace contract

Source of truth: skills/overlay-apps/app/ (in the repo).
Running instance: <workspace>/overlay-apps/benchmark-overlay/ — node_modules and any local state live here, not in the repo. Code in the

Track record

Benchmark

22 / 22

test cases passed, vs 8 / 22 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v5 — 8/17/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

sonichi / sutando

skills/overlay-apps/SKILL.md

View on GitHub ↗

License MITImported 8/17/2026Version v2Bundled 1 file · scripts

More skills from the same source and nearby in the registry, with their headline benchmark lift.

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See it in action

What's inside

Overlay Apps

When to use

Done & failure modes

Ships with

Layout — workspace contract

Track record

Benchmark

Adoption

SkillSafety

Source

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