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59 lines
1.5 KiB
Plaintext
59 lines
1.5 KiB
Plaintext
---
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title: approval
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sidebarTitle: approval
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---
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# `fastmcp.apps.approval`
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Approval — a Provider that adds human-in-the-loop approval to any server.
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The LLM presents a summary of what it's about to do, and the user
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approves or rejects via buttons. The result is sent back into the
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conversation as a message, prompting the LLM's next turn.
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Requires ``fastmcp[apps]`` (prefab-ui).
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Usage::
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from fastmcp import FastMCP
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from fastmcp.apps.approval import Approval
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mcp = FastMCP("My Server")
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mcp.add_provider(Approval())
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## Classes
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### `Approval` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/fastmcp_slim/fastmcp/apps/approval.py#L49" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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A Provider that adds human-in-the-loop approval to a server.
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The LLM calls the ``request_approval`` tool with a summary and
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optional details. The user sees an approval card with Approve and
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Reject buttons. Clicking either sends a message back into the
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conversation (via ``SendMessage``), triggering the LLM's next turn.
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The message appears as if the user sent it, so the LLM sees
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something like ``'"Deploy v3.2 to production" is APPROVED'``.
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Example::
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from fastmcp import FastMCP
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from fastmcp.apps.approval import Approval
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mcp = FastMCP("My Server")
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mcp.add_provider(Approval())
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Customized::
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Approval(
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title="Deploy Gate",
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approve_text="Ship it",
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approve_variant="default",
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reject_text="Abort",
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reject_variant="destructive",
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)
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