GitHub - crawshaw/yeah: yeah: LLM-powered yes/no CLI tool

A command-line tool that answers yes/no questions using an LLM. It returns its answer as an exit code: 0 for true, 1 for false, 2 for error.

$ yeah does 2 + 2 equal 4?
$ echo $?
0

$ yeah does 2 + 2 equal 5?
$ echo $?
1

$ yeah is there a file called go.mod in this directory?
$ echo $?
0

No output. No prompts. Just an exit code.

Install

go install github.com/crawshaw/yeah@latest

Configuration

All configuration is via environment variables:

Variable	Description	Default
`YEAH_PROVIDER`	LLM provider: `anthropic` or `openai`	`anthropic`
`YEAH_MODEL`	Model name	`claude-sonnet-4-5-20250929` (anthropic) / `gpt-4.1` (openai)
`YEAH_GATEWAY`	LLM gateway URL	exe.dev gateway
`ANTHROPIC_API_KEY`	Anthropic API key	not needed with gateway
`OPENAI_API_KEY`	OpenAI API key	not needed with gateway

Examples

Use in shell scripts:

if yeah is the disk more than 90% full?; then
  echo "Disk space critical!"
fi

if yeah does main.go contain a function called main?; then
  echo "Found main function"
fi

if yeah is git installed on this system?; then
  git status
fi

Safety

Like all LLM-powered tools, it is as safe as your LLM.

Which is to say, it is not safe. The warranty disclaimer in the LICENSE is doing a lot of work here.

However to make it a little less awful, on macOS yeah runs under sandbox-exec with a deny-file-write policy, and uses landlock on Linux for similar results.