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A skill your agent uses when working on the Harmonica Kotlin DB migration tool — planning, phase work, PRs, or anything touching this repo.
Install Harmonica Dev
$ npx skills add KenjiOhtsuka/harmonica --skill harmonica-dev -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install KenjiOhtsuka/harmonica harmonica-dev --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/KenjiOhtsuka/harmonica.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.opencode/skills/harmonica-dev .claude/skills/harmonica-dev && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "harmonica-dev" agent skill from https://github.com/KenjiOhtsuka/harmonica/tree/develop/.opencode/skills/harmonica-dev into .claude/skills/harmonica-dev/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "harmonica-dev", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/KenjiOhtsuka/harmonica/tree/develop/.opencode/skills/harmonica-devType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add KenjiOhtsuka/harmonica --skill harmonica-dev -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install KenjiOhtsuka/harmonica harmonica-dev --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/KenjiOhtsuka/harmonica.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.opencode/skills/harmonica-dev .agents/skills/harmonica-dev && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "harmonica-dev" agent skill from https://github.com/KenjiOhtsuka/harmonica/tree/develop/.opencode/skills/harmonica-dev into .agents/skills/harmonica-dev/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "harmonica-dev", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add KenjiOhtsuka/harmonica --skill harmonica-dev -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install KenjiOhtsuka/harmonica harmonica-dev --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/KenjiOhtsuka/harmonica.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.opencode/skills/harmonica-dev .cursor/skills/harmonica-dev && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "harmonica-dev" agent skill from https://github.com/KenjiOhtsuka/harmonica/tree/develop/.opencode/skills/harmonica-dev into .cursor/skills/harmonica-dev/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "harmonica-dev", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/KenjiOhtsuka/harmonica.git --path .opencode/skills/harmonica-dev--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add KenjiOhtsuka/harmonica --skill harmonica-dev -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install KenjiOhtsuka/harmonica harmonica-dev --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/KenjiOhtsuka/harmonica.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.opencode/skills/harmonica-dev .gemini/skills/harmonica-dev && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "harmonica-dev" agent skill from https://github.com/KenjiOhtsuka/harmonica/tree/develop/.opencode/skills/harmonica-dev into .gemini/skills/harmonica-dev/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "harmonica-dev", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install KenjiOhtsuka/harmonica harmonica-devInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add KenjiOhtsuka/harmonica --skill harmonica-dev -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/KenjiOhtsuka/harmonica.git skills-src && mkdir -p .github/skills && cp -r skills-src/.opencode/skills/harmonica-dev .github/skills/harmonica-dev && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "harmonica-dev" agent skill from https://github.com/KenjiOhtsuka/harmonica/tree/develop/.opencode/skills/harmonica-dev into .github/skills/harmonica-dev/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "harmonica-dev", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add KenjiOhtsuka/harmonica --skill harmonica-dev -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install KenjiOhtsuka/harmonica harmonica-dev --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/KenjiOhtsuka/harmonica.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.opencode/skills/harmonica-dev .opencode/skills/harmonica-dev && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "harmonica-dev" agent skill from https://github.com/KenjiOhtsuka/harmonica/tree/develop/.opencode/skills/harmonica-dev into .opencode/skills/harmonica-dev/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "harmonica-dev", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
harmonica-dev- GitHub stars
- 131
- Token cost
- ~742 tokens
- SKILL.md length
- 359 words
- Files
- 1
- Skills in repo
- 2
- Repo updated
- First seen
- Licence
- MIT
At a glance
A skill your agent uses when working on the Harmonica Kotlin DB migration tool — planning, phase work, PRs, or anything touching this repo.
- Works in 3 steps: Read spec/plan.md (master plan + open… → Read the phase-specific spec that… → Check spec/plan.md §6 "Open decisions" —…
- Working on the Harmonica Kotlin DB migration tool — planning
- SKILL.md covers Before proposing work, Hard constraints, Conventions and Workflow, plus 1 more section
- Calls git
What it does
Harmonica Dev is an agent skill from KenjiOhtsuka/harmonica. Use when working on the Harmonica Kotlin DB migration tool — planning, phase work, PRs, or anything touching this repo. Encodes the restart workflow: read spec/ before proposing work, small PRs per issue, toolchain constraints (JVM 8 target, Gradle 9.7.0 + Kotlin 2.3.20 on the Java 25 dev machine), and conventions (no comments, no unused deps, core stays Exposed-free).
Its SKILL.md is about 740 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Mobile, covering Android development and Database migrations. It works with Kotlin, Gradle and Java. The repository describes itself as: Kotlin Database Migration Tool. This tool makes it really easy to create table, index, add columns, and so on, with Kotlin DSL. The licence is MIT.
When your agent uses it
- Working on the Harmonica Kotlin DB migration tool — planning
- Anything touching this repo
Example prompts
- “/harmonica-dev”
Workflow steps
3 steps, taken from the first numbered list in SKILL.md.
- Read spec/plan.md (master plan + open decisions + risk register).
- Read the phase-specific spec that applies: spec/ci.md, spec/testing.md,
- Check spec/plan.md §6 "Open decisions" — if the work depends on an
What it can do on your machine
Read from SKILL.md and the folder at commit 32e06c9. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Shell commands in SKILL.md call:
git
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md. Its commands use git, which can reach the network depending on how they are called.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Harmonica Dev loads about 742 tokens when it runs. Until then it costs about 96 tokens; SKILL.md has 359 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from KenjiOhtsuka/harmonica at commit 32e06c9, republished under its MIT licence (© KenjiOhtsuka). 359 words, ~742 tokens.
Download SKILL.mdSave it as
.claude/skills/harmonica-dev/SKILL.md (or your agent's skills folder).- name
- harmonica-dev
- description
- Use when working on the Harmonica Kotlin DB migration tool — planning, phase work, PRs, or anything touching this repo. Encodes the restart workflow: read spec/ before proposing work, small PRs per issue, toolchain constraints (JVM 8 target, Gradle 9.7.0 + Kotlin 2.3.20 on the Java 25 dev machine), and conventions (no comments, no unused deps, core stays Exposed-free).
Harmonica Development
Work on this repository happens in phases tracked in spec/plan.md. The
spec/ directory is the source of truth; keep it in sync when decisions
change.
Before proposing work
- Read
spec/plan.md(master plan + open decisions + risk register). - Read the phase-specific spec that applies:
spec/ci.md,spec/testing.md,spec/exposed-integration.md,spec/issues-triage.md,spec/tech-notes.md. - Check
spec/plan.md§6 "Open decisions" — if the work depends on an unresolved decision, flag it and ask before proceeding.
Hard constraints
- JVM 8 bytecode target (
jvmTarget = 1.8) — never bump. ./gradlew buildworks on this machine (Gradle 9.7.0 + Kotlin 2.3.20 on OpenJDK 25). A red build is a real bug — fix it, don't defer.- One change per PR against
develop. - Never push directly to
develop— docs/spec and.opencode/**changes go through the same small-PR flow as code. - Never commit unless explicitly asked.
Conventions
- No comments in code unless asked.
- No new dependencies unless actually used (repo has a history of unused deps).
coremust never import Exposed.document/is a stale nested build — excluded from the root build since Phase 0; do not expect it to compile in./gradlew build.- When editing any file under
.opencode/**, load thecustomize-opencodeskill and consult the OpenCode configuration schema.
Show full SKILL.md (162 more words)Show less
Workflow
- Cut a phase/feature branch from the current
origin/develop(fetch first). Never cut from a sibling unmerged feature branch — it contaminates the PR diff. - Do the work, then open a small PR. When integrating
developinto the PR branch, prefergit mergeover rebase; nevergit pull --rebasea branch that already contains merge commits, and never amend or force-push commits that exist on the remote. - After finishing a phase, update the relevant
spec/doc (plan phase status, DoD, open decisions) as part of the same PR. - After a phase PR or milestone merges, run the
plan-reviewskill to reconcilespec/plan.md,spec/tech-notes.md, andspec/issues-triage.mdwith reality (git log, issues/PRs, versions, test counts) — the reconcile itself lands as a docs PR, never a direct push. - Use the review subagents (
spec-review,build-review,exposed-review) to validate spec-adjacent work before opening a PR.
Current phase status
See spec/plan.md — phase status is reconciled by the plan-review skill
after each merge, so don't hard-code the current phase here.
© KenjiOhtsuka, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in .opencode/skills/harmonica-dev of KenjiOhtsuka/harmonica.
Open the folder on GitHubat commit 32e06c9
Compare with similar skills
Harmonica Dev next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Harmonica Dev this skillKenjiOhtsuka/harmonica | 131 | — | ~742 | Automated safety check: Pass | MIT | |
| Android Audio E2Ehyochan/react-native-nitro-sound | 961 | — | ~814 | Automated safety check: Pass | MIT | |
| Kotlin Tooling Immutable Collections 0 5 X MigrationKotlin/kotlin-agent-skills | 1.1k | — | ~2.3k | Automated safety check: Pass | Apache-2.0 | |
| Kotlin Tooling Kotlin ToolchainKotlin/kotlin-agent-skills | 1.1k | — | ~2.4k | Automated safety check: Pass | Apache-2.0 | |
| Apc BuildJoker-x-dev/AndroidProject-Compose | 102 | — | ~553 | Automated safety check: Pass | None | |
| Neo4j Driver Java Skillneo4j-contrib/neo4j-skills | 114 | — | ~4.2k | Automated safety check: Notes | MIT |
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Related
Questions about Harmonica Dev
What does Harmonica Dev do?
A skill your agent uses when working on the Harmonica Kotlin DB migration tool — planning, phase work, PRs, or anything touching this repo. Harmonica Dev is an agent skill from KenjiOhtsuka/harmonica. Use when working on the Harmonica Kotlin DB migration tool — planning, phase work, PRs, or anything touching this repo.
When should I use Harmonica Dev?
Harmonica Dev fits situations like: working on the Harmonica Kotlin DB migration tool — planning; anything touching this repo.
How do I install Harmonica Dev in Claude Code?
Run `npx skills add KenjiOhtsuka/harmonica --skill harmonica-dev -a claude-code`. Or copy the skill folder (.opencode/skills/harmonica-dev in KenjiOhtsuka/harmonica) into .claude/skills/harmonica-dev in your project. Claude Code loads it when a task matches its description.
How do I install Harmonica Dev in Codex?
Run `npx skills add KenjiOhtsuka/harmonica --skill harmonica-dev -a codex`. Or copy the skill folder (.opencode/skills/harmonica-dev in KenjiOhtsuka/harmonica) into .agents/skills/harmonica-dev in your project. Codex loads it when a task matches its description.
Can I use Harmonica Dev in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add KenjiOhtsuka/harmonica --skill harmonica-dev -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/harmonica-dev, .gemini/skills/harmonica-dev, .github/skills/harmonica-dev and .opencode/skills/harmonica-dev in your project.
What does Harmonica Dev need to run?
Going by SKILL.md and its folder, Harmonica Dev needs the command-line tools its instructions call (git).
Does Harmonica Dev access the network?
SKILL.md contains no URLs. Its commands use git, which can reach the network depending on how they are called. This is read from the text; nothing was executed.
Is Harmonica Dev safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Harmonica Dev use?
Harmonica Dev is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Harmonica Dev use?
About 742 tokens (SKILL.md is roughly 3k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Harmonica Dev?
Skills that share tags, products or a category with Harmonica Dev: Android Audio E2E (hyochan/react-native-nitro-sound, 961 stars), Kotlin Tooling Immutable Collections 0 5 X Migration (Kotlin/kotlin-agent-skills, 1.1k stars), Kotlin Tooling Kotlin Toolchain (Kotlin/kotlin-agent-skills, 1.1k stars) and Apc Build (Joker-x-dev/AndroidProject-Compose, 102 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Harmonica Dev?
KenjiOhtsuka (a GitHub user) maintains it in KenjiOhtsuka/harmonica, which has 131 GitHub stars. The repository holds 2 skills in this directory. The repository was last updated on September 22, 2026.
Source: KenjiOhtsuka/harmonica on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.