contract-preflight SKILL.md skillA
contract-preflight from aibtcdev/skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add aibtcdev/skills/contract-preflight@git:20260430.7b47804Pins git:20260430.7b47804 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- aibtcdev/skills
- Path
contract-preflight/SKILL.md- Versions recorded
- 3
- Latest version
- git:20260430.7b47804, committed Apr 30, 2026
- First version recorded
- Apr 16, 2026
- Size
- 6,322 bytes
- Repository stars
- 11
- License
- none declared
Dry-run Stacks contract calls against mainnet state before broadcasting — catches errors, prevents wasted gas.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Contract Pre-Flight Dry-run any Stacks contract call against live mainnet state without broadcasting. Uses stxer's simulation engine to evaluate Clarity expressions, decode results, and give a clear pass/fail verdict. If the simulation returns `(err ...)` or a runtime error, the skill blocks broadcast and explains why. ## What it does Before you broadcast a contract call, this skill creates a simulation session, runs your Clarity expression against the current chain state, and tells you whether it would succeed or fail. No gas spent. No on-chain state changed. Just a verdict: safe to broadcast, or not. ## Why agents need it On-chain transaction failures cost gas and abort visibly. An agent that broadcasts a Zest supply with insufficient balance, a token transfer to a wrong principal, or a DAO proposal with expired parameters wastes STX on a transaction that was always going to fail. This skill eliminates that category of error entirely. Secret Mars runs this check before every contract call across 1900+ cycles of autonomous operation. Zero aborted transactions since adopting the pattern. ## Commands ### `doctor` …
Read the whole file at its exact version.
How to install
mdr add aibtcdev/skills/contract-preflight@sha256:bd4fa82405b304dbThe line at the top of this page pins the label git:20260430.7b47804, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_ama67dpbrvzumz5h)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Apr 16, 2026 and Apr 30, 2026, about one every 7 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260430.7b47804 latest | 2026-04-30 | 7b47804 | 6,322 B | A | view · diff |
| git:20260421.5472699 | 2026-04-21 | 5472699 | 6,360 B | A | view · diff |
| git:20260416.4a284c7 | 2026-04-16 | 4a284c7 | 6,395 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (6322 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
aibtcdev/skills · 11 stars · license none declared · pushed 2026-10-29 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_ama67dpbrvzumz5h GET https://markdownregistry.com/api/v1/resolve?ref=aibtcdev/skills/contract-preflight GET https://markdownregistry.com/api/v1/blob/bd4fa82405b304dbc4f2876579ea65bce59ba7ea004f855a87099be121ef89b8
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.