# Use Plan Mode with model steering for complex tasks

Architecting a complex solution requires precision. By combining Plan Mode's
structured environment with model steering's real-time feedback, you can guide
Gemini CLI through the research and design phases to ensure the final
implementation plan is exactly what you need.

> **Note:** This is a preview feature under active development. Preview features
> may only be available in the **Preview** channel or may need to be enabled
> under `/settings`.

## Prerequisites

- Gemini CLI installed and authenticated.
- [Plan Mode](../plan-mode.md) enabled in your settings.
- [Model steering](../model-steering.md) enabled in your settings.

## Why combine Plan Mode and model steering?

[Plan Mode](../plan-mode.md) typically follows a linear path: research, propose,
and draft. Adding model steering lets you:

1.  **Direct the research:** Correct the agent if it's looking in the wrong
    directory or missing a key dependency.
2.  **Iterate mid-draft:** Suggest a different architectural pattern while the
    agent is still writing the plan.
3.  **Speed up the loop:** Avoid waiting for a full research turn to finish
    before providing critical context.

## Step 1: Start a complex task

Enter Plan Mode and start a task that requires research.

**Prompt:** `/plan I want to implement a new notification service using Redis.`

Gemini CLI enters Plan Mode and starts researching your existing codebase to
identify where the new service should live.

## Step 2: Steer the research phase

As you see the agent calling tools like `list_directory` or `grep_search`, you
might realize it's missing the relevant context.

**Action:** While the spinner is active, type your hint:
`"Don't forget to check packages/common/queues for the existing Redis config."`

**Result:** Gemini CLI acknowledges your hint and immediately incorporates it
into its research. You'll see it start exploring the directory you suggested in
its very next turn.

## Step 3: Refine the design mid-turn

After research, the agent starts drafting the implementation plan. If you notice
it's proposing a design that doesn't align with your goals, steer it.

**Action:** Type:
`"Actually, let's use a Publisher/Subscriber pattern instead of a simple queue for this service."`

**Result:** The agent stops drafting the current version of the plan,
re-evaluates the design based on your feedback, and starts a new draft that uses
the Pub/Sub pattern.

## Step 4: Approve and implement

Once the agent has used your hints to craft the perfect plan, review the final
`.md` file.

**Action:** Type: `"Looks perfect. Let's start the implementation."`

Gemini CLI exits Plan Mode and transitions to the implementation phase. Because
the plan was refined in real-time with your feedback, the agent can now execute
each step with higher confidence and fewer errors.

## Tips for effective steering

- **Be specific:** Instead of "do it differently," try "use the existing
  `Logger` class in `src/utils`."
- **Steer early:** Providing feedback during the research phase is more
  efficient than waiting for the final plan to be drafted.
- **Use for context:** Steering is a great way to provide knowledge that might
  not be obvious from reading the code (e.g., "We are planning to deprecate this
  module next month").

## Next steps

- Explore [Agent Skills](../skills.md) to add specialized expertise to your
  planning turns.
- See the [Model steering reference](../model-steering.md) for technical
  details.