Individual skill

validation-first-driven

Use when protocols, workflows, concurrency, or lifecycle state need states, transitions, and temporal properties. Not for domain models: use type-driven. Not for contracts: use contract-driven.

.devin/skills/validation-first-driven/SKILL.md

Read pinned source

Source commit b0e8ce89a19fac880251dc3ea1babfeb4503a4fe

What was checked

Matches the observed repository HEAD: Yes
Scanner rules are current: Yes
Repository scan complete: No
Skill scan complete: Yes
Observed behavior: Instructions only
Last checked: Nov 4, 2026

These are observations at the recorded commit, not a guarantee of safety. Review the source before running it.

Install this skill

Choose an agent in your Stack or copy a command below. Commands fetch the pinned commit and copy only this skill directory. Existing destinations are refused. Copying a command does not install anything.

An install command is unavailable: current rules, complete repository and skill scans, an eligible behavior level and a permitted license are required.

Repository context

Repository stars (not skill ratings): 55
Repository last updated: Sep 28, 2026
License: Apache-2.0

Observed agent integration: No specific integration evidence. Standard SKILL.md installation does not imply verified compatibility.

odd Repository topic
odin Repository topic
outline Repository topic
outlines Repository topic
coding-paradigm Repository topic
outline-driven-development Repository topic
claude-plugins Repository topic
codex-cli Repository topic
gemini-cli-extensions Repository topic
outline-driven Repository topic
legal Derived category

Files and excerpt

File metadata and permitted, redacted excerpts come from the recorded scan. Source links are pinned to that commit.

Browse files

SKILL.mdcore · 5,999 bytes
agents/openai.yamlasset · 190 bytes
references/approaches.mddoc · 977 bytes
references/event-sourcing.mddoc · 344 bytes
references/examples.mddoc · 3,268 bytes
references/formal-tools.mddoc · 1,448 bytes

Read excerpt


# Validation-first development

## Contract

| Field | Bound contract |
|---|---|
| Trigger | The work builds protocols, workflows, concurrent systems, or lifecycle-heavy state, or needs temporal properties or a state machine. |
| Authority | Reversible local: writes only within the stated target; rollback is version control. No remote mutation. No file or VCS mutation outside the stated target. |
| Side effect | Writes the model and spec plus implementation assertions and tests; creates a TLA+ or Alloy spec for high-risk designs. |
| Done | The state space is explicit, transitions are total, invariants are checked, and each temporal property maps to an assertion, test, or model-checker run. |

## Inputs

- Requirements or design document. Required.