diffs
Use the diffs tool to produce real, shareable diffs (viewer URL, file artifact, or both) instead of manual edit summaries.
What this skill does
When you need to show edits as a real diff, prefer the `diffs` tool instead of writing a manual summary. The `diffs` tool accepts either `before` + `after` text, or a unified `patch` string. Use `mode=view` when you want an interactive gateway-hosted viewer. After the tool returns, use `details.viewerUrl` with the canvas tool via `canvas present` or `canvas navigate`. If the deployment uses a loopback trusted proxy (for example Tailscale Serve with `gateway.trustedProxies` including `127.0.0.1`), raw loopback viewer requests can fail closed without forwarded client-IP headers. In that topology, prefer `mode=file` / `mode=both`, or use a configured `viewerBaseUrl` / explicit proxy/public `baseUrl` when you need a shareable viewer URL. Use `mode=file` when you need a rendered file artifact. Set `fileFormat=png` (default) or `fileFormat=pdf`. The tool result includes `details.filePath`. For large or high-fidelity files, use `fileQuality` (`standard`|`hq`|`print`) and optionally override `fileScale`/`fileMaxWidth`. When you need to deliver the rendered file to a user or channel, do not rely on the raw tool-result renderer. Instead, call the `message` tool and pass `details.filePath` through `path` or `filePath`. Use `mode=both` when you want both the gateway viewer URL and the rendered artifact. If the user has configured diffs plugin defaults, prefer omitting `mode`, `theme`, `layout`, and related presentation options unless you need to override them for this specific diff. Include `path` for before/after text when you know the file name.
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