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Write the contract and invariants before the code v1.0.0

Use this resource to write code whose invariants and edge cases are stated before implementation

New

  • 403 downloads
  • 248 likes
  • 112 saves

Free

Install with the CLI

In a terminal, from the folder you want:

npx --yes palatekit@latest install invariant-first-correct-code

With no option, the skill goes to ~/.agents/skills/; add --agent claude-code (or codex, cursor…) to target an agent.

First time: connect the CLI with

npx --yes palatekit@latest login

The agent states the function's contract, the loop invariant, the termination argument and the edge cases, then writes the code and checks that it respects them. Classic traps, such as finding the leftmost match or the majority vote, are handled explicitly.

Mostly picked by

Updated November 2, 2026

Card for the “Write the contract and invariants before the code” skill

Details

Generates with
Your agent's model
Licence
Apache-2.0

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What you get

  • SKILL.md: pre-write protocol and edge-case table
  • SKILL.md: traps (Boyer-Moore majority vote, binary search) and examples

Good fit for

  • Your binary search sometimes returns the wrong match
  • You are writing an algorithm whose tests do not cover the boundaries

Not for

    Tags

    • invariants
    • correctness
    • algorithms
    • edge cases
    • contract

    About

    You say

    “Write a search for the first occurrence in this sorted list, stating the contract and invariants first.”

    Card for the “Write the contract and invariants before the code” skill

    Skill published by morsechimwai under the Apache-2.0 license, delivered in its original version.

    Show more

    How to use it

    1. Install the skill in your agent's skills folder
    2. Ask your agent to write code whose invariants and edge cases are stated before implementation
    3. Review and adjust the result

    Content preview

    Files

    • LICENSE1.1 KB
    • NOTICE-PALATEKIT.md0.5 KB
    • SKILL.md18.5 KB

    Origin and licence

    Listed unmodified

    Author
    morsechimwai
    Source
    github.com/sickn33/agentic-awesome-skills/tree/e9809578fd426a284af017c5db99f8eb6628e6ca/skills/invariant-guard
    Licence
    Apache-2.0

    Notice

    « invariant-guard » (morsechimwai, Apache-2.0) livré dans sa version d'origine : fiche en français et en anglais par PalateKit.

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