aaddrick / building-with-typesafe-jev

Building with TypeSafe Jev 
 Typed decisions with calibrated confidence, for your coding agent. 
 Links to 150+ community projects, sorted by shape, with a code sketch for each. 
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> [!NOTE]
> This is an unofficial, community skill. It is not made, reviewed, or endorsed by TypeSafe AI. TypeSafe publishes its own skill at typesafe-ai/skills. See How this differs from the official skill.
Coding agents treat Jev like one more chat model. This skill teaches them to design for it: typed questions, calibrated confidence, and links to 150+ community projects, sorted by how they work, with a code sketch for each pattern. It installs in Claude Code, Codex, Antigravity CLI, Muse, and Muse Code.
Jev is a System One model. It does not write text. You send it content and a set of typed questions, and it answers each one with a value and a calibrated probability, usually in 100 to 200 ms:
- **Choice** picks one option from a list. Example: route a ticket to billing, shipping, or support.
- **Score** places the content on a scale you describe. Example: grade a pull request from "ignores the spec" to "meets the spec".
- **Noul** gives the probability that a yes/no statement is true. Example: "this shell command deletes files outside the project."
## Install
 Claude Code 
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The skill loads on its own when you work on Jev code. To load it by hand, type:
 [code] 
 Claude Desktop, Cowork, and claude.ai 
**Step 1.** Open **Customize > Plugins**, select **Add**, then **Add marketplace**.
**Step 2.** Choose **Add from a repository**.
**Step 3.** Enter `aaddrick/building-with-typesafe-jev`. Leave **Sync automatically** on so the plugin updates when this repository does. Then select **Sync**.
**Step 4.** Select **Add** next to **Building with typesafe jev**.
**Step 5.** Claude confirms the plugin is installed. It also appears in the desktop app and Cowork on the same account.
 Codex 
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Start a new thread. Codex loads the skill when the task matches. To load it by hand, type:
 [code] 
 Antigravity CLI 
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Check that it installed:
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Start a new session. Antigravity CLI loads the skill when the task matches. To load it by hand, type:
 [code] 
Coming from Gemini CLI? If `agy plugin import gemini` brought this extension over, run the install command above anyway so the current copy replaces the imported one.
 Muse (muse.ai) 
Muse loads skills from `~/workspace/skills/` on its own computer. Paste this command into a Muse chat and ask Muse to run it:
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The script copies the skill folder there and rewrites the `SKILL.md` header into the shape Muse reads. Start a new chat. Muse loads the skill when the task matches. To update, run the command again.
 Muse Code 
Clone the repository:
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Install the skill for every project:
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Check that it installed:
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Start a new session. Muse Code loads the skill when the task mat