Knack for AI agents
Knack is a no-code database platform teams use to build custom web apps and store structured records without writing code. Connect it once through Arc0, and your agent, or Claude, ChatGPT and Cursor, can use it through one MCP endpoint, limited to what each user approved.
What agents do in Knack.
Create a new object record
Add a new record to a Knack object, such as a customer or order, from another system.
Look up records in a view
Read records from a filtered view to answer a question without changing any data.
Confirm before deleting a record
Require approval before deleting an object record, since Knack does not keep a recycle bin.
10 Knack actions, graded by risk.
Every Knack action is tagged read, write or destructive, so one policy covers the whole app and new actions inherit the right default.
read
3Look things up. Allowed by default.
- knack.get_object_recordGet Object Record
- knack.list_view_recordsList View Records
- knack.list_object_recordsList Object Records
write
5Create and change things. Allow, or ask the user first.
- knack.create_view_recordCreate View Record
- knack.create_object_recordCreate object record
- knack.update_object_recordUpdate object record
- knack.upload_fileUpload File
- knack.upload_imageUpload Image
destructive
2Delete, cancel or archive. Ask first, or deny outright.
- knack.delete_view_recordDelete View Record
- knack.delete_object_recordDelete Object Record
Knack in three steps.
- 01Your users connect KnackThey add their Knack api key on Arc0 Connect, under your brand. It goes straight into the vault.
- 02You set the rulesReads run, writes like “create View Record” can wait for the user, and “delete View Record” can be denied outright.
- 03Any agent can actYour agent calls Knack through the Arc0 SDK or MCP, and so can Claude, ChatGPT and Cursor. Every call lands on the audit log.
await arc0.policies.set('knack', { read: 'allow', write: 'ask', // create_view_record destructive: 'deny', // delete_view_record }) # Claude Code: the same connection, one URL $ claude mcp add --transport http arc0 \ https://mcp.arc0.ai/u/u_8f2
How Knack connects.
Users add their Knack api key on Arc0 Connect. It is encrypted in the vault, never shown to the model, and each user can rotate or revoke it at any time.
The same Knack connection serves your agent over MCP and your own backend over REST and the proxy, so a user connects once. How Arc0 handles credentials →
- AUTH
- API key
- CREDENTIALS
- Per-tenant encrypted vault
- MODEL SEES
- Results only, never credentials
- AUDIT LOG
- Every call, on every plan
Use Knack from any agent.
ClaudeChatGPTCursor
Codex
VS CodeOpenAI Agents SDKClaude Agent SDK
Vercel AI SDK
Mastra
LangGraphMore databases and spreadsheets apps.
Knack and Arc0, answered.
Can I use Knack with Claude, ChatGPT or Cursor?
Yes. Connect Knack to Arc0 once, then add your Arc0 MCP URL to Claude, ChatGPT, Cursor, Claude Code or any other remote-MCP client. Each assistant only gets the Knack actions you allow.
How do users connect Knack?
Users add their Knack api key on Arc0 Connect. It is encrypted in the vault, never shown to the model, and each user can rotate or revoke it at any time.
Which Knack actions can my agent take?
10 in total: 3 read, 5 write and 2 destructive, such as “create View Record”. Your policies decide which of them each agent may call.
Can I stop my agent from deleting things in Knack?
Yes. Actions like “delete View Record” are graded destructive. Set destructive actions to deny, or to ask so the user approves each one, and blocked calls still show up on the audit log.
Can my own backend call Knack too?
Yes. The same Knack connection is available over REST and through the Arc0 proxy, so your product and your agent share one connection per user.
Plug Knack into your agent.
Your users connect Knack once, under your brand. Your agent gets 10 actions behind your policies, with every call on the record.
Free to build · MCP + REST · Audit log on every plan