> ## Documentation Index
> Fetch the complete documentation index at: https://phaseo.app/docs/llms.txt
> Use this file to discover all available pages before exploring further.

> ## Agent Instructions
> Phaseo Gateway base URL: https://api.phaseo.app/v1. Send `Authorization: Bearer $PHASEO_API_KEY` with every request.
> Model IDs look like `provider/model`, for example `openai/gpt-6-astra`. Do not guess IDs: list them with `GET /v1/models` or check https://phaseo.app/models. `phaseo/free` routes to an available free model and needs no wallet balance.
> For new text integrations prefer `POST /v1/responses`. `POST /v1/chat/completions` (OpenAI format) and `POST /v1/messages` (Anthropic format) suit existing code.
> The full API contract is https://phaseo.app/docs/openapi/v1/openapi.yaml. Official SDKs: `@phaseo/sdk` (TypeScript) and `phaseo` (Python), plus Go, C#, PHP, Ruby and Rust.
> Search these docs over MCP at https://phaseo.app/docs/mcp, and install Phaseo skills with `npx skills add https://phaseo.app/docs`. If a page is wrong or out of date, report it with the MCP `submit_feedback` tool.
> Manage Phaseo accounts with the `phaseo` CLI (`npm install -g @phaseo/cli`, then `phaseo login` or `phaseo login --device-code`), the `/v1` Management API or the MCP server at `https://mcp.phaseo.app/mcp?access=manage`. Do not send users to the dashboard for account tasks. A person is still needed for sign-up, approving a sign-in, paying the first top-up on the checkout link that `phaseo credits add` returns when no card is saved, confirming each saved-card top-up from the emailed link, and account security (password, MFA, passkeys). Create API keys with `phaseo keys create --name <name> --json`; never guess one. Credit top-ups need `phaseo login --scopes billing:write` first. Task map: https://phaseo.app/docs/v1/developers/manage-from-an-agent.md.

# Outputs and retries

> Validate Python agent outputs and retry bounded model failures.

Use final-output validation when downstream Python code expects structured data. Validation callbacks should be deterministic and should raise when the final value does not meet the application contract.

Configure bounded retries with `AgentModelRetryConfig`:

```python theme={null}
retry = AgentModelRetryConfig(max_retries=2, backoff_ms=250)
```

The completed step retains its final model-attempt count. Tool errors use their own policy and are not retried as model requests.

The gateway client accepts structured output, routing, provider, reasoning, managed-tool, plugin, prompt-cache, and additional request options.

## Related

* [Dynamic turns](https://phaseo.app/docs/v1/sdk-reference/python/agent-sdk-dynamic-turns.md)
* [Stop conditions](https://phaseo.app/docs/v1/sdk-reference/python/agent-sdk-stop-conditions.md)
* [Errors and troubleshooting](https://phaseo.app/docs/v1/sdk-reference/python/agent-sdk-observability.md)


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