Canvasight Open

What it does

When your agent uses it

• The user asks to start Canvasight
• Open the Canvasight workspace
• Attach the current Codex task
• Verify whether a native canvas actually became ready

Example prompts

• “/canvasight-open”

Workflow steps

7 steps, taken from the first numbered list in SKILL.md.

1. 1Read the active task's CODEX_THREAD_ID and current working directory from the shell. Require both a non-empty thread id and an absolute…
2. 2If the tools are not callable, use tool_search for canvasight open_canvasight await_canvasight_widget_ready render_canvasight_canvas_widget.
3. 3Call open_canvasight exactly once for this user-level open action, pass the explicit projectPath, and retain the complete provisional…
4. 4Read sessionId and openAttemptId from the retained result's structuredContent. Tool completion is not evidence that the canvas rendered.
5. 5Immediately call await_canvasight_widget_ready with those two ids and the same threadId. Treat these two MCP calls as one indivisible…
6. 6Report the canvas as opened or ready only when the result has status: "ready", verified: true, displayMode: "fullscreen", and all of…
7. 7For timeout, failed, missing identity/evidence, or a non-fullscreen instance, report openAttemptId, widgetInstanceId, stage, and error…

What it can do on your machine

Read from SKILL.md and the folder at commit f47e0bf. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  No scripts in the folder and no shell commands in SKILL.md.

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  No URLs in SKILL.md.

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names no API keys, tokens, secrets or passwords.

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Canvasight Open loads about 1.1k tokens when it runs, and up to ~2.4k if it reads all its reference files. Until then it costs about 78 tokens; SKILL.md has 490 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~78

When it runs · the whole SKILL.md, loaded when a task matches

~1.1k

With references · SKILL.md plus every file in references/, read only if the agent opens them

~2.4k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from Niall-Young/Canvasight at commit f47e0bf, republished under its MIT licence (© Niall-Young). 490 words, ~1,062 tokens.

name

canvasight-open

description

Open, reopen, attach, and verify Canvasight's Codex native widget, or explicitly open a browser fallback. Use when the user asks to start Canvasight, open the Canvasight workspace, 打开画布, 打开 Canvasight, 恢复最近项目, attach the current Codex task, or verify whether a native canvas actually became ready.

opened = open_canvasight({ threadId, projectPath })
sessionId = opened.structuredContent.sessionId
openAttemptId = opened.structuredContent.openAttemptId
ready = await_canvasight_widget_ready({ sessionId, openAttemptId, threadId })

© Niall-Young, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 1 other file (references) in plugins/canvasight/skills/canvasight-open of Niall-Young/Canvasight.

• SKILL.md
• references/open-workflow.md

Open the folder on GitHubat commit f47e0bf