using-string ยท diff
git:20260609.51c4915 to git:20260610.a35df04
5 added, 1 removed. Audit A to A.
---
name: using-string
description: >
Use the installed String MCP tool for String apps, SFMD, web pages, shell
sessions, and commands like /open, /act, /install, or /set.
---
# Using String
You have the installed String MCP tool named `string`; some hosts display it with a server prefix.
Call it with `{ topic, cmd }`, for example `{ "topic": "main", "cmd": "/info" }`.
- Use topics like `main`, `app:<name>`, `app:<name>:<config>`, `bash:<name>`, or hubs `app`, `tool`, `bash`, `system`.
+ Use topics like `main`, `app:<name>`, `app:<name>:<config>`, `bash:<name>`, or hubs `app`, `tool`, `bash`, `event`, `system`.
`cmd` must start with `/`; use `/help`, `/info`, and `/act --help` to discover what to do.
Use `/open` to read files, URLs, or apps; installed apps can run `/act.<name>` directly from `app:<name>` if you already know the action.
Use `/edit` to inspect raw files, `/write` to create or overwrite, `/append` to add content, and `/replace` for exact text, block, or line-range edits.
Use `/install` to add apps; `/set $VAR = "..."` for app credentials.
+
+ Use topic `event` with `/events`, `/events.read <id>`, and `/events.ack <id>` to handle local webhook messages.
+
+ Claude Code may also receive those webhook messages through the String channel, but ack still happens with `/events.ack <id>`.
Read the payload inside `<๐=string:TOPIC>...</๐>` and follow `Recovery:` or `next:` hints.