Happier is an open-source, end-to-end encrypted client that lets people run AI coding-agent sessions on a computer and continue controlling them from a phone, browser, or desktop app. It is for developers who use agents such as Claude Code, Codex, Gemini, or OpenCode across multiple devices, with self-hosting available. The catalogue entries are add-ons for configuring or extending this client and its supported coding-agent workflows.
Borrowing it
Nothing to install: this file belongs to happier-dev/happier. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/happier-dev/happier/dev/.agents/skills/happier-profile-and-optimize/SKILL.mdgit clone --depth 1 https://github.com/happier-dev/happierWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/happier-dev/happier/happier-profile-and-optimize)<a href="https://agentmods.dev/skills/happier-dev/happier/happier-profile-and-optimize"><img src="https://agentmods.dev/badge/skills/happier-dev/happier/happier-profile-and-optimize/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/happier-dev/happier/happier-profile-and-optimize"><img src="https://agentmods.dev/badge/skills/happier-dev/happier/happier-profile-and-optimize.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00133 | $0.02788 |
| Opus 5.5 | $0.00053 | $0.01115 |
| Sonnet 5.5 | $0.00027 | $0.00558 |
| Haiku 4.5 | $0.00013 | $0.00279 |
Grade A, and why
happier-profile-and-optimize scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
2. Resolve the device id from `curl -s localhost:18829/json/list` and use **`reactNative.logicalDeviceId`** — never the raw simulator UDID. Select the exact logical device, never the first compatible debugger target; mul How it starts
The opening of the file, as written. The whole thing — 102 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Happier Profile and Optimize
Use this skill for any work whose success is a measured cost, not a behavior: slow open/foreground/navigation, jank, hangs, startup, memory, render churn, a query that got slow, or verifying somebody's speedup claim. It is the investigation method — reach for it once a cost exists.
It is deliberately not the list of things to watch for while writing code. Those must apply unprompted, at authoring time, long before anyone suspects a problem, so they live in package instructions that are read on every task: apps/ui/AGENTS.md → Performance and continuity owns the UI write-time invariants (referential stability, narrow subscriptions, component-type stability, high-frequency state placement, dependency-array identity, loop stop conditions, one perf change lands on all platforms). If you are about to restate one of those here, stop and strengthen it there instead.
The rules this skill operates under also live elsewhere and are not restated: root AGENTS.md → Product priorities (name the phase and metric, instrument must be able to see the cost, no ratio without both sides on the same workload and machine state, no blanket memoization) and Risk-weighted execution. Read those; do not re-derive them.
Route out, do not absorb:
.agents/skills/happier-diagnose— the incident is a failure (error, hang-to-crash, broken session), not a cost. Diagnose first, then return here only if the outcome is a cost..agents/skills/happier-testing— lanes, RED/GREEN, mutation proof, live gates. A perf fix with a behavior change is still test-first there..agents/skills/happier-implement— the actual change, canonical-owner discovery, split-brain sweep..agents/skills/verify-claims— before relying on any delegated or reported number..agents/skills/attack-conclusion— before handing off a perf verdict.
1. Frame the cost before touching an instrument
State, in one line each: the phase (cold open, warm foreground, navigation, steady state, per-commit), the metric (blocked ms, count, bytes, dropped frames), the workload (session size, row count, account), and the user-visible symptom. A metric without a phase cannot be reproduced or compared.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 1mo ago Changed · +6 lines 485d8929884a
- 1mo ago Changed 4ec6ee8c120d
- 1mo ago First seen · 96 lines · 133 tokens per session scan A 6a56a1b5ab4d
happier-profile-and-optimize is a skill published in the GitHub repository happier-dev/happier (2,072 stars, last pushed yesterday), licensed MIT. It adds 133 tokens to every session and 2,788 once invoked, about $0.0005 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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