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Sweep 25 Sep 2026 · 19:33Z Build v2.1.283 504 read Stable v2.1.274 Latest v2.1.283 Next v2.1.283 Feeds RSS JSON llms.txt llms-full.txt Unofficial
HomeDocsClaude Documentation 25 Sep 2026
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Get started changedclaude-tag/users/getting-started

Nearest release: v2.1.283, published 5 hours before upstream edited the page. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.

Upstream edited this page at 25 Sep 2026 23:59 UTC, give or take a minute or two: the time comes from Anthropic’s own sitemap rather than from a commit. This site recorded the change at 26 Sep 2026 00:07 UTC.

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8080After you've handed Claude a task, the first question is what it has to work with. The short version: it reads the thread you tagged it in, it can search your workspace's public channels, and anything beyond Slack depends on what your admin connected.
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82| What you give Claude | Can Claude read it? |
83| :---------------------------------------------------------- | :---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
84| Messages in this thread | Yes. Mentioning it mid-thread also gives it the thread's earlier messages |
85| A file you attach (image, screenshot, PDF, or another type) | Yes, up to a size limit that depends on the file type. See [Files you attach](#files-you-attach) |
86| Other public channels in your workspace | By searching only, the same way a person searches Slack; Claude can find a message by keyword but can't read a channel's full history unless it's been added there |
87| Private channels and DMs | Only from inside them. Adding Claude to a private channel lets it work there, but the channel stays unreadable from any other channel or DM. |
88| A link you paste, like a Google Doc or a webpage | Only if your admin allowed that site for this channel. If not, Claude tells you it can't reach it. For files in your personal Drive or Google account, DM Claude instead; [a DM uses your own connectors](/docs/claude-tag/concepts/agent-identity#direct-message-channels) |
89| A Slack canvas | No |
90| A message you edited after sending | Yes. Each edit sends Claude a note showing the text before and after the edit. An edit never starts a new task on its own, so to be sure a correction is picked up, say it in a new reply. Deleting a reply doesn't notify Claude, and deleting the thread's first message before anyone replies closes the session; see [Reply in the thread to steer](/docs/claude-tag/concepts/how-it-works#reply-in-the-thread-to-steer) |
82| What you give Claude | Can Claude read it? |
83| :---------------------------------------------------------- | :-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
84| Messages in this thread | Yes. Mentioning it mid-thread also gives it the thread's earlier messages |
85| A file you attach (image, screenshot, PDF, or another type) | Yes, up to a size limit that depends on the file type. See [Files you attach](#files-you-attach) |
86| Other public channels in your workspace | By searching only, the same way a person searches Slack; Claude can find a message by keyword but can't read a channel's full history unless it's been added there |
87| Private channels and DMs | Only from inside them. Adding Claude to a private channel lets it work there, but the channel stays unreadable from any other channel or DM. |
88| A link you paste, like a Google Doc or a webpage | Only if your admin allowed that site for this channel. If not, Claude tells you it can't reach it. For files in your personal Drive or Google account, DM Claude instead; [a DM uses your own connectors](/docs/claude-tag/concepts/agent-identity#direct-message-channels) |
89| A Slack canvas | No |
90| A message you edited after sending | Yes. Each edit sends Claude a note showing the text before and after the edit. An edit never starts a new task on its own, so to be sure a correction is picked up, say it in a new reply; see [Reply in the thread to steer](/docs/claude-tag/concepts/how-it-works#reply-in-the-thread-to-steer) |
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9292The fastest way to find out for your channel is to ask: `@Claude can you read the doc I just linked?` gets you a yes or a "that site isn't allowed here."
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