j*SrSSKJr SrSrSrSSjrg) u9 Workaround module — call it only along an OAuth code path. This module exists solely to satisfy Anthropic's Claude Code OAuth subscription gate, which requires the system prompt to be sent in array format with a specific identity string as the first text block. pydantic-ai's `AnthropicModel` joins all `system_prompt=` parts into a single string before sending, so an agent built with `system_prompt=` alone cannot reach the gate through the library. It sends a list of text blocks instead whenever a request carries instruction parts or the `anthropic_cache_instructions` setting. Instruction parts come from `instructions=`, from toolset or capability instructions, and from prompted output mode. Upstream issue draft: `issues/pydantic-ai-multi-block-system-prompt.md` (not yet filed against pydantic/pydantic-ai). When the upstream fix ships and pydantic-ai supports array system prompts natively: 1. Delete this module. 2. Replace every `make_oauth_anthropic_model` call with a stock `AnthropicModel`, and give every agent built on it `CLAUDE_CODE_IDENTITY` as its first system block, ahead of its own prompt. 3. Delete `issues/pydantic-ai-multi-block-system-prompt.md`. Scope guarantees (the ring-fence): - Every caller of `make_oauth_anthropic_model`, in `quber/agents/` and in `quber/playground/agent.py`, calls it only along the OAuth code path, when an OAuth token resolves. The API-key path (`ANTHROPIC_API_KEY`) constructs a stock `AnthropicModel` and never calls into this module. - The wrapped `AsyncAnthropic` client is constructed *inside* this module and returned only via `make_oauth_anthropic_model`. Nothing else in quber holds a reference to that client. The wrapped `messages.create` cannot leak into other usages. - The wrapper rewrites only the `system` field, only when it is a plain string. List-shaped `system` and `None` are pass-through. A list goes out without the identity block, so an agent whose requests carry instruction parts or `anthropic_cache_instructions` gets no identity block from this wrapper. - The wrapper applies to **all** model IDs invoked through this client. That is intentional: the gate is a property of the subscription endpoint, not of any specific model. Haiku passes the gate too — sending the identity block does not change Haiku's behavior. ) annotationsz9You are Claude Code, Anthropic's official CLI for Claude.z>claude-cli/2.1.119 (external, claude-vscode, agent-sdk/0.1.75)z%oauth-2025-04-20,claude-code-20250219c^SSKJn SSKJn SSKJn U"U[ [S.S9nURRRmU4SjnXeRRl U"X"US9S 9$) ufConstruct an `AnthropicModel` whose underlying SDK client has its `beta.messages.create` wrapped to rewrite the `system` field into the 2-block array format the OAuth gate requires. Returned model is safe to hand to pydantic-ai's `Agent` — it behaves like any other `AnthropicModel` from the library's perspective. The rewrite is invisible to the caller. r)AsyncAnthropic)AnthropicModel)AnthropicProvider)zanthropic-betaz User-Agent) auth_tokendefault_headersc># URS5n[U[5(aS[S.SUS./US'T"U0UD6IShvN $N7f)Nsystemtext)typer )get isinstancestrCLAUDE_CODE_IDENTITY)argskwargsr orig_creates 6/home/mande/repo/quber/src/quber/agents/_oauth_gate.pycreate_with_identity_block>make_oauth_anthropic_model..create_with_identity_block^sX H% fc " ")=>0 F8 !$1&1111sAA A A )anthropic_client)provider) anthropicrpydantic_ai.models.anthropicrpydantic_ai.providers.anthropicrCLAUDE_CODE_BETACLAUDE_CODE_USER_AGENTbetamessagescreate) model_namerrrrclientrrs @rmake_oauth_anthropic_modelr$Gsh);A .0 F++&&--K 2#=KK */@RX/Y ZZN)r"rrr)__doc__ __future__rrrrr$r%rr)s0/b#S Z ;'[r%