Document partner agents GitHub App process (#61030)

Co-authored-by: Joe Clark <31087804+jc-clark@users.noreply.github.com>
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

Author: 3 people

content/copilot/concepts/agents/about-third-party-agents.md

@@ -71,7 +71,16 @@ Within your monthly usage allowance for {% data variables.product.prodname_actio
 
 For more information, see [AUTOTITLE](/billing/managing-billing-for-your-products/managing-billing-for-github-copilot/about-billing-for-github-copilot).
 
+## Partner agents
+
+When enabling partner agents in your user or organization {% data variables.copilot.copilot_cloud_agent %} settings, a {% data variables.product.prodname_github_app %} will be installed for the corresponding agent.
+
+* **Allow Claude coding agent** will install `anthropic code agent`
+* **Allow Codex coding agent** will install `openai code agent`
+
+Actions taken by these {% data variables.product.prodname_github_apps %} will be visible in your audit log, but the {% data variables.product.prodname_github_apps %} themselves will not be visible in your account's list of {% data variables.product.prodname_github_app %} installations.
+
 ## Next steps
 
 * To start managing agents, see [AUTOTITLE](/copilot/how-tos/use-copilot-agents/manage-agents).
-* To learn how AI models are hosted and served, see [AUTOTITLE](/copilot/reference/ai-models/model-hosting).
+* To learn how AI models are hosted and served, see [AUTOTITLE](/copilot/reference/ai-models/model-hosting).