agent-canvas-environment skillA
agent-canvas-environment is agent-read markdown (skill) from openhands/extensions: Work effectively inside a local Agent Canvas environment, including local agent-server auth, frontend/backend port discovery, safe workspace hygiene, and delegating work to a new local conversation through POST /api/conversations..
Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.
What the file says
# Agent Canvas Environment
Use this skill when running inside or alongside a local Agent Canvas stack, especially when the user asks to inspect the local backend, create or monitor local conversations, or delegate work to another local conversation.
## Core rules
- Treat the local Agent Canvas backend as an agent-server API, usually `http://localhost:8001`.
- Treat the local UI as a separate frontend, usually `http://localhost:8000`.
- Do not print session API keys. Pass them directly in `X-Session-API-Key`.
- Trust any runtime-services block or explicit user-provided host over default ports.
- Before mutating a repository, check `git status -sb`. If a worktree has unrelated changes, use a separate worktree or clone.
- When delegating, write a self-contained prompt. The new conversation does not inherit the current chat context.
## Find the session key
Use the first available value, without echoing it:
```bash
KEY="${SESSION_API_KEY:-${OH_SESSION_API_KEYS_0:-${LOCAL_BACKEND_API_KEY:-}}}"
if [ -z "$KEY" ] && [ -f "$HOME/.openhands/agent-canvas/api-key.txt" ]; then
KEY="$(tr -d '\n' < "$HOME/.openhands/agent-canvas/api-key.txt")"
fi
…Read the whole file at its exact version.
How to install
mdr add openhands/extensions/agent-canvas-environment@git:20260627.b0092a3mdr add openhands/extensions/agent-canvas-environment@sha256:40562401fb3e07a9Pin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.
[](https://markdownregistry.com/a/art_5r75rqr3asqwpubu)
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Versions
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260627.b0092a3 latest | 2026-06-27 | b0092a3 | 9,959 B | A | view · diff |
| git:20260619.bb34a76 | 2026-06-19 | bb34a76 | 5,008 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 (9959 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
openhands/extensions · 150 stars · license MIT · pushed 2026-09-24 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_5r75rqr3asqwpubu GET https://markdownregistry.com/api/v1/resolve?ref=openhands/extensions/agent-canvas-environment GET https://markdownregistry.com/api/v1/blob/40562401fb3e07a921f4a1451cc44a4ed6441239c18a4f334791fa6a953f103c
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