# PostHog Code Inbox signal sources - Docs

Inbox uses signal sources to find work worth investigating. A signal can be a production error, a support conversation, a session replay pattern, or an issue from an external tracker.

## Configure sources

1.  Open **Inbox** in PostHog Code.
2.  Click the **Settings** icon or open the **Signal Sources** tab.
3.  Toggle the sources you want to enable.
4.  Follow the authentication prompts for external services.

**MCP is handled for you**

You don't need to configure MCP servers for Inbox sources manually. Once your repository is connected in PostHog Code, research tasks can run automatically.

## PostHog sources

These sources are available when the matching PostHog product has data in your project.

-   [Error TrackingNew exceptions, reopened issues, and error volume spikes.](/docs/error-tracking.md)

-   [SupportActionable items from conversations.](/docs/support.md)

-   [Session ReplayUX friction, unusual behavior, rage clicks.](/docs/session-replay.md)

## External sources

External sources pull issue context into the same Inbox queue as your product signals.

| Source | What Inbox reads | What Inbox does |
| --- | --- | --- |
| GitHub Issues | New issues in connected repositories | Starts a research task to find related code and decide whether a fix is possible |
| Linear | Issue title, description, labels, and linked context | Searches the codebase and keeps the report tied to the original issue |
| Zendesk | Customer support ticket context | Turns actionable bug reports into researched implementation work |

## What happens next

When a signal arrives, Inbox creates a report and starts research if the source is enabled. The research agent connects the signal to the codebase, checks user impact, and marks the report as **Actionable** when a code fix is possible.

From there, you can:

-   Review the report in Inbox
-   Ask for more research
-   Let an implementation agent open a PR
-   Audit the agent log to see exactly what it read and why

Learn more about [research tasks](/docs/posthog-code/inbox/research.md) and [implementation tasks](/docs/posthog-code/inbox/implementation.md).

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