> For the complete documentation index and Markdown links, see [llms.txt](/docs/llms.txt).

# Agent Settings

Agent Settings live in the **AI** section of the Settings Editor, which configures model providers, External Agents, and MCP servers.
Open it with <code class="hljs">agent: open settings</code> (also available from the top-right menu in the [Agent Panel](./agent-panel.md)), which takes you straight to the AI page.
You can also reach the same page with <code class="hljs">zed: open settings</code> and selecting **AI** in the sidebar.

Within the AI page, LLM Providers, External Agents, and MCP Servers each open as their own sub-page under the **General** section.

| Surface         | Opens with                      | Use it for                                                                  |
| --------------- | ------------------------------- | --------------------------------------------------------------------------- |
| Settings Editor | <code class="hljs">agent: open settings</code>   | AI settings: LLM providers, External Agents, MCP servers, and related pages |
| Settings file   | <code class="hljs">zed: open settings file</code> | Direct JSON edits and settings not exposed in UI                            |

For general settings mechanics, see [Configuring Zed](../configuring-zed.md).

## LLM Providers {#llm-providers}

The `LLM Providers` section configures model providers for Zed AI features, including Zed Agent, Inline Assistant, Git commit generation, thread summaries, and similar model-backed features.

Use this section to:

- sign in to supported subscription-backed providers
- enter provider API keys
- add OpenAI-compatible providers
- remove providers

For the model-access paths and provider-specific setup, see [LLM Providers](./llm-providers.md).

## Feature-Specific Settings {#feature-specific-settings}

Some Zed AI features have their own model or prompt settings in `settings.json`, including:

- `agent.inline_assistant_model`
- `agent.commit_message_model`
- `agent.thread_summary_model`
- `agent.subagent_model`
- `agent.commit_message_instructions`
- `agent.inline_alternatives`

Use `agent.commit_message_instructions` for instructions that apply only to generated Git commit messages:

```json 
{
  "agent": {
    "commit_message_instructions": "Use the Conventional Commits format: <type>(<scope>): <description>."
  }
}
```

For feature-specific model examples, see [Feature-specific Models](#feature-specific-models).

## Automatic Compaction {#automatic-compaction}

Zed Agent can automatically compact long threads before they reach the selected model's context window. Compaction summarizes earlier messages and keeps the conversation usable without starting a new thread.

Automatic compaction is enabled by default and runs when the thread reaches `90%` of the model's context window. You can change the threshold or disable automatic compaction in `settings.json`:

```json 
{
  "agent": {
    "auto_compact": {
      "enabled": true,
      "threshold": "90%"
    }
  }
}
```

The `threshold` value can be one of:

| Value                           | Meaning                                                                        |
| ------------------------------- | ------------------------------------------------------------------------------ |
| Percentage string, like `90%`   | Compact when the thread uses that percentage of the model's context window.    |
| Positive integer, like `100000` | Compact after that many tokens have been used.                                 |
| Negative integer, like `-20000` | Compact once fewer than that many tokens remain in the model's context window. |

`0` is not a valid threshold. If the threshold is invalid, Zed falls back to `90%`.

You can compact a Zed Agent thread manually at any time by typing `/compact` in the Agent Panel message editor. For more on thread token usage and compaction behavior, see [Token Usage and Compaction](./agent-panel.md#token-usage).

## External Agents {#external-agents}

The External Agents section configures ACP-integrated agents.

Use `Add Agent` to:

- `Install from Registry`
- `Add Custom Agent`

For setup details and support boundaries, see [External Agents](./external-agents.md).

## MCP Servers {#mcp-servers}

The `MCP Servers` page configures Model Context Protocol servers connected to Zed.

Use `Add Server` (in the page header) to:

- `Add Local Server`
- `Add Remote Server`
- `Install from Extensions`

Each configured server row exposes:

- a `Configure` (gear) button to edit the server
- an `Uninstall` (trash) button to remove it
- a toggle to enable or disable it

For MCP setup, auth, server status, and agent-path boundaries, see [MCP](./mcp.md).

## Related Configuration {#related-configuration}

Some AI settings are not configured on the AI settings pages:

| Task                                                         | Go to                                          |
| ------------------------------------------------------------ | ---------------------------------------------- |
| Choose which tools are available in a Zed Agent thread       | [Agent Profiles](./agent-profiles.md)          |
| Control whether tool calls are allowed, denied, or confirmed | [Tool Permissions](./tool-permissions.md)      |
| Configure reusable task instructions                         | [Skills](./skills.md)                          |
| Configure always-on personal or project instructions         | [Instructions](./instructions.md)              |
| Configure edit prediction providers                          | [Edit Prediction](./edit-prediction.md)        |
| Turn AI off                                                  | [AI Quick Start](./quick-start.md#turn-ai-off) |
| Edit raw settings JSON                                       | [Configuring Zed](../configuring-zed.md)       |

## Feature-Specific Models {#feature-specific-models}

Zed supports feature-specific model settings for Inline Assistant, Git commit generation, thread summaries, and subagents. Configure these in settings when you need a different model for a specific workflow.

See [LLM Providers](./llm-providers.md) for model access, and [All Settings](../reference/all-settings.md) for the complete settings reference.

## Model Temperature {#model-temperature}

Most Zed AI features use the selected model's default generation behavior.
Use `agent.model_parameters` when you need to set a temperature for a provider,
a model, or a specific provider/model pair.

```json 
{
  "agent": {
    "model_parameters": [
      {
        "provider": "anthropic",
        "model": "claude-sonnet-4-5",
        "temperature": 0.2
      }
    ]
  }
}
```

Zed checks matching entries from last to first. An entry can omit `provider` or
`model` to apply more broadly. For provider-specific model configuration such as
custom model entries, context windows, or gateway routing, see
[LLM Providers](./llm-providers.md) and the provider setup pages.

## Rules, Skills, and Instructions {#rules-skills-instructions}

Reusable Rules have been replaced by [Skills](./skills.md). Always-on Rules have moved to [Instructions](./instructions.md), including personal `AGENTS.md` and project instruction files.

Older builds or transitional UI may still refer to `Rules`. Use [Skills](./skills.md) for reusable task instructions and [Instructions](./instructions.md) for always-on context.