checkpoint SKILL.md skillA
checkpoint from chainreactors/ioa is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add chainreactors/ioa/checkpoint@git:20260608.9514d23Pins git:20260608.9514d23 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- chainreactors/ioa
- Path
skills/checkpoint/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260608.9514d23, committed Jun 8, 2026
- Size
- 1,504 bytes
- Repository stars
- 26
- License
- MIT
Human-in-the-loop review protocol. Use when execution reaches an approval boundary that requires human judgment before proceeding.
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
# Checkpoint
Pause execution and submit an artifact for human review. Execution resumes only after the reviewer responds.
## Message format
Send with `content_type: "checkpoint"` on the message envelope.
Content body:
```json
{
"id": "<unique-id>",
"title": "Short description",
"content": "Markdown body with full context for the reviewer",
"options": ["Approve", "Reject"]
}
```
`id` is required and must be unique. Optional fields: `kind`, `target`, `status`.
Response — the reviewer sends this (with `refs.messages` pointing to your checkpoint):
```json
{
"option": "Approve",
"feedback": "Free-form comment from reviewer"
}
```
The response has **no `content_type`**. It is identified by the `refs.messages` relationship, not by content type.
## Mechanism
- `"Reject"` triggers mechanism-level rollback. All other options are semantic guidance.
- Submission blocks your session until feedback arrives.
## When to use
- Destructive or irreversible action ahead
- Plan needs approval before execution
- Human preference matters between alternatives
Do NOT checkpoint trivial decisions.
## After receiving feedback
…Read the whole file at its exact version.
How to install
mdr add chainreactors/ioa/checkpoint@sha256:c8fd548dbfb55313The line at the top of this page pins the label git:20260608.9514d23, 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_f2vjgkhvnl3ndjhx)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Jun 8, 2026.
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 (1504 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
chainreactors/ioa · 26 stars · license MIT · pushed 2026-09-20 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_f2vjgkhvnl3ndjhx GET https://markdownregistry.com/api/v1/resolve?ref=chainreactors/ioa/checkpoint GET https://markdownregistry.com/api/v1/blob/c8fd548dbfb553130e1e7f4b1dd35cffb71973038584c98dbf77baaf9a11ac13
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.
More from chainreactors/ioa
Every file in chainreactors/ioa