message-claude SKILL.md skillA
message-claude from heapy/kortex is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add heapy/kortex/message-claude@git:20261008.0e35997Pins git:20261008.0e35997 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- heapy/kortex
- Path
plugins/heapy/skills/message-claude/SKILL.md- Versions recorded
- 4
- Latest version
- git:20261008.0e35997, committed Oct 8, 2026
- First version recorded
- Aug 25, 2026
- Size
- 3,430 bytes
- Repository stars
- 7
- License
- Apache-2.0
Send a message from an external agent or script to a running Claude Code session on the same machine. Use when a manually started Codex session needs to tell any Claude session something, Codex needs to report back to the Claude session that launched it, a hook or long job should notify Claude, or the user asks to "send this to Claude", "tell another Claude session", "notify the Claude session", or "report back to Claude". Not for messaging from inside Claude Code when ListAgents and…
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
# Message Claude
Find the exact Claude Code session and send it one plain-text message.
For the opposite direction, use [Message Codex](../message-codex/SKILL.md).
If `ListAgents` and `SendMessage` are available, use them. Do not use the raw inbox to bypass a
permission rule that denied either tool. The workflow below is for external callers such as a
standalone Codex session, Codex launched by Claude, a hook, or a script.
The bundled helper supports macOS, Linux, and WSL 2. Native Windows uses a named pipe and is not
implemented here. Requires JDK 17+ and Kotlin 2.4.21+ (`kotlinr` on `PATH`).
The first run resolves the pinned JSON dependency and compiles the script.
## Send a message
Resolve [scripts/message_claude.main.kts](scripts/message_claude.main.kts) from this skill's directory.
1. List the registered sessions:
```sh
kotlinr <skill-dir>/scripts/message_claude.main.kts --list
```
2. Select the target by its exact `name`. If names repeat, narrow with `--cwd` or `--pid`. Never
guess between multiple matches.
3. Send a short message:
```sh
kotlinr <skill-dir>/scripts/message_claude.main.kts \
--name the-session-name \
…Read the whole file at its exact version.
How to install
mdr add heapy/kortex/message-claude@sha256:573dfd3e28da3c44The line at the top of this page pins the label git:20261008.0e35997, 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_l7l5w73yhipnbzjz)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 4 versions of this file, between Aug 25, 2026 and Oct 8, 2026, about one every 15 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261008.0e35997 latest | 2026-10-08 | 0e35997 | 3,430 B | A | view · diff |
| git:20260825.a3fae39 | 2026-08-25 | a3fae39 | 3,272 B | A | view · diff |
| git:20260825.09fdcb9 | 2026-08-25 | 09fdcb9 | 3,144 B | A | view · diff |
| git:20260825.baa6299 | 2026-08-25 | baa6299 | 14,805 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 (3430 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
heapy/kortex · 7 stars · license Apache-2.0 · pushed 2026-10-22 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_l7l5w73yhipnbzjz GET https://markdownregistry.com/api/v1/resolve?ref=heapy/kortex/message-claude GET https://markdownregistry.com/api/v1/blob/573dfd3e28da3c4435048deadf8d2efedae6a56550e9cda22e46a156f6642f2e
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.