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Claude Agent SDK for Elixir – Build AI agents with Claude Code

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claude_code lib claude_code hook output pre_tool_use.ex
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lib/claude_code/hook/output/pre_tool_use.ex 

defmodule ClaudeCode.Hook.Output.PreToolUse do

  @moduledoc """

  Hook-specific output for `PreToolUse` events.



  Controls whether a tool is allowed, denied, or requires user confirmation.



  Shorthand: `{:allow, []}`, `{:deny, permission_decision_reason: "..."}`,

  `{:ask, []}`, or `{:ok, additional_context: "..."}` (no permission decision).



  ## Fields



    * `:permission_decision` - `"allow"`, `"deny"`, or `"ask"`

    * `:permission_decision_reason` - explanation for the decision

    * `:updated_input` - replacement tool input map

    * `:additional_context` - extra context injected into the conversation

  """

  alias ClaudeCode.Hook.Output



  @type permission_decision :: String.t()



  @type t :: %__MODULE__{

          permission_decision: permission_decision() | nil,

          permission_decision_reason: String.t() | nil,

          updated_input: map() | nil,

          additional_context: String.t() | nil

        }



  defstruct [

    :permission_decision,

    :permission_decision_reason,

    :updated_input,

    :additional_context

  ]



  def to_wire(%__MODULE__{} = o) do

    %{"hookEventName" => "PreToolUse"}

    |> Output.maybe_put("permissionDecision", o.permission_decision)

    |> Output.maybe_put("permissionDecisionReason", o.permission_decision_reason)

    |> Output.maybe_put("updatedInput", o.updated_input)

    |> Output.maybe_put("additionalContext", o.additional_context)

  end

end