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Proposals are how you, or an agent, create a task (or series of tasks) to assign to built-in coding agents such as Claude Code or OpenAI Codex for implementation. create a new proposal There are a number of templates available, which can be selected from the template picker in the top right of the screen.
If you just want to implement something quick, select “Quick Change” from the template picker.
Upon pressing “Create Proposal” you will be taken to the proposal’s view screen where you will see a number of available actions including “Prepare Coding Agent” to start implementation.

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Specification Driven Development

Specification (or “Spec”) Driven Development is a methodology wherein you define the “what” up-front and let coding agent(s) define both the technical specification and the backlog of tasks to build it.
The Coconut Registry has a number of built-in agents specifically designed to help with the process, including the Technical Specification Creator Agent and Proposal Creator Agent.