stan-ai-client 0.1.4

Thin Python client for running Claude Code and Codex via local executables.

stan_ai_client

stan_ai_client is a thin Python wrapper around local AI coding CLIs.

It supports Claude Code through the local claude executable and Codex through the local codex exec executable. It does not call Anthropic or OpenAI APIs directly; the relevant CLI must already be installed and authenticated on the machine.

The library is intentionally small and pragmatic:

• run_text() for plain-text output
• run_json() for Claude JSON envelopes or Codex JSONL events
• run_structured() for schema-validated structured output
• typed results
• structured exceptions
• local JSON Schema validation
• rate-limit parsing helpers
• opt-in rate-limit retry policy
• stdlib logging

Why Use It

Use stan_ai_client when you want:

• a small Python API on top of Claude Code or Codex
• text mode and JSON mode without hand-rolling subprocess logic
• strongly guided structured output with local validation
• command metadata, typed JSON payloads, and normalized exceptions
• safe-by-default prompt logging behavior
• local automation that already depends on Claude Code or Codex being installed

Typical use cases:

• article summarization
• tagging or YAML generation
• one-shot repository or directory analysis
• local scripts that need session metadata, usage, cost, or duration

It is not a replacement for the Anthropic SDK, the OpenAI SDK, or the Codex SDK. It intentionally stays at the local process-wrapper layer.

Install

From PyPI

pip install stan-ai-client

From a local checkout

python3 -m venv .venv
source .venv/bin/activate
pip install -e ".[dev]"

From GitHub

pip install "git+https://github.com/<your-user>/stan_ai_client.git"

Releases

• the package version lives in pyproject.toml
• every non-bot push or merge to main bumps patch automatically
• tags use vX.Y.Z
• main releases build and publish to PyPI automatically
• release commits are created by GitHub Actions as chore: release vX.Y.Z [skip ci]

Quickstart

1. Install Claude Code or Codex

Make sure the CLI you want is already available on your machine and authenticated:

claude --version
codex --version

2. Run the smoke test

python examples/smoke_test.py
python examples/codex_smoke_test.py

Those run text-mode and JSON-mode calls against the selected local CLI.

Minimal Usage

Claude text mode

from stan_ai_client import ClaudeCodeClient

client = ClaudeCodeClient()
result = client.run_text("Reply with the single word: ok")
print(result.text)

Claude JSON mode

from pathlib import Path

from stan_ai_client import ClaudeCodeClient, RunOptions

client = ClaudeCodeClient(
    default_model="claude-opus-4-6",
    default_effort="max",
    default_timeout_seconds=180,
)

result = client.run_json(
    "Summarize this article.",
    options=RunOptions(
        cwd=Path("."),
        allowed_tools=("Read", "Glob", "Grep", "Bash"),
    ),
)

print(result.payload.result)
print(result.payload.total_cost_usd)
print(result.payload.session_id)

Claude structured mode

from stan_ai_client import ClaudeCodeClient, StructuredSchema

client = ClaudeCodeClient()

schema = StructuredSchema.from_dict(
    {
        "type": "object",
        "properties": {
            "summary": {"type": "string"},
            "tags": {"type": "array", "items": {"type": "string"}},
        },
        "required": ["summary", "tags"],
        "additionalProperties": False,
    }
)

result = client.run_structured(
    "Summarize this article and return tags.",
    schema=schema,
)

print(result.structured_output["summary"])
print(result.payload.session_id)
print(result.payload.total_cost_usd)

run_structured() validates the schema before Claude runs, requires structured_output in the response, and validates the returned object locally against the same schema.

Codex text mode

from stan_ai_client import CodexClient

client = CodexClient()
result = client.run_text("Reply with the single word: ok")
print(result.text)

CodexClient targets codex exec. By default it passes --dangerously-bypass-approvals-and-sandbox, matching the current automation preference for this package. Use CodexRunOptions(permission_mode="default") to omit that flag and let Codex use its configured defaults.

Codex JSONL mode

from stan_ai_client import CodexClient

client = CodexClient()
result = client.run_json("Summarize this repository.")

print(result.payload.result)
print(result.payload.thread_id)
print(result.payload.usage)

Codex JSON mode uses codex exec --json, so the payload represents parsed JSONL events instead of a Claude-style one-object envelope.

Codex structured mode

from stan_ai_client import CodexClient, StructuredSchema

client = CodexClient()
schema = StructuredSchema.from_dict(
    {
        "type": "object",
        "properties": {"summary": {"type": "string"}},
        "required": ["summary"],
        "additionalProperties": False,
    }
)

result = client.run_structured("Summarize this repository.", schema=schema)
print(result.structured_output["summary"])

Codex structured mode writes the validated schema to a temporary JSON file, passes it with --output-schema, parses the final response as JSON, and validates the returned object locally.

Codex additionally validates schemas against the OpenAI structured-output subset before invoking the CLI. The root schema must be an object, every object property must be required, and objects must set additionalProperties: false. Unsupported schema keywords such as allOf, oneOf, not, dependentRequired, dependentSchemas, if, then, and else are rejected locally. Structured Codex runs may also resume existing sessions with session_id or continue_last_session.

Logging

import logging

from stan_ai_client import ClaudeCodeClient

logging.basicConfig(level=logging.INFO)
logger = logging.getLogger("my_app.claude")

client = ClaudeCodeClient(
    logger=logger,
    log_prompts=False,
)

client.run_text("Reply with the single word: ok")

By default, logging includes execution metadata, not full prompt text. Set log_prompts=True only if you explicitly want prompts written to logs.

Error handling

If you automate Claude Code in batch jobs, pass a RateLimitRetryPolicy to let the client wait through parseable Claude rate limits up to your budget.

from stan_ai_client import ClaudeCodeClient, RateLimitRetryPolicy

client = ClaudeCodeClient()

result = client.run_json(
    "Summarize this repository.",
    rate_limit_policy=RateLimitRetryPolicy(
        max_wait_seconds=5 * 60 * 60,
        label="repo summary",
    ),
)

For user-facing workflows, omit rate_limit_policy and catch ClaudeRateLimitError so you can return the reset time to the user.

from stan_ai_client import ClaudeCodeClient, ClaudeRateLimitError

client = ClaudeCodeClient()

try:
    result = client.run_json("Summarize this repository.")
except ClaudeRateLimitError as exc:
    print(exc.reset_at or exc.retry_after_seconds)

Public Surface

Top-level exports:

from stan_ai_client import (
    __version__,
    ClaudeCodeClient,
    CodexClient,
    RunOptions,
    CodexRunOptions,
    TextRunResult,
    JsonRunResult,
    StructuredRunResult,
    CodexJsonRunResult,
    CodexStructuredRunResult,
    ClaudeJsonPayload,
    CodexJsonPayload,
    CommandMetadata,
    StructuredSchema,
    AIClientError,
    AIClientTimeoutError,
    ClaudeCodeError,
    CodexCodeError,
    ClaudeExecutableNotFoundError,
    CodexExecutableNotFoundError,
    ClaudeLimitError,
    CodexLimitError,
    ClaudeTimeoutError,
    CodexTimeoutError,
    ClaudeProcessError,
    CodexProcessError,
    ClaudeProtocolError,
    CodexProtocolError,
    ClaudeRateLimitError,
    CodexRateLimitError,
    StructuredSchemaValidationError,
    ClaudeSchemaValidationError,
    CodexSchemaValidationError,
    ClaudeStructuredOutputMissingError,
    CodexStructuredOutputMissingError,
    ClaudeStructuredOutputValidationError,
    CodexStructuredOutputValidationError,
    RateLimitRetryPolicy,
    RateLimitInfo,
    parse_rate_limit_info,
)

Supported Features

• text mode via run_text()
• JSON mode via run_json()
• structured mode via run_structured()
• prompts sent over stdin by default
• optional argv prompt mode
• per-call working directory control
• model, effort/reasoning-effort, timeout, environment, and session controls
• support for Claude CLI flags via typed RunOptions
• support for Codex CLI flags via typed CodexRunOptions
• raw stdout and stderr preserved on results and errors
• opt-in stdlib logging with safe default prompt handling
• typed JSON payload parsing with unknown fields preserved in extras
• typed Codex JSONL payload parsing with raw events preserved
• local input and output validation for structured mode
• rate-limit detection, reset-time parsing, and opt-in retry policy

Examples

• examples/smoke_test.py
• examples/codex_smoke_test.py
• examples/summarize_article.py
• examples/tag_article.py
• examples/logging_demo.py
• examples/rate_limit_retry.py

Documentation

See DOCS.md for:

• full RunOptions reference
• logging behavior
• result types
• structured output usage
• exception model
• rate-limit handling
• session usage
• common patterns
• current limitations
• maintainer release flow

Notes

• prompts default to stdin instead of argv
• Claude JSON mode always requests --output-format json
• Claude structured mode always requests --output-format json and --json-schema
• Claude text mode always requests --output-format text
• Codex JSON mode uses codex exec --json
• Codex structured mode uses codex exec --output-schema <tempfile>
• Codex defaults to --dangerously-bypass-approvals-and-sandbox
• logging uses stdlib logging
• prompts are not written to logs unless log_prompts=True
• the library is sync-only in 0.1.x
• streaming is intentionally out of scope right now

Current Limitations

• no streaming support
• no async API
• no background scheduler or persistent job queue
• no standalone CLI wrapper command
• no first-class typed wrapper yet for every Claude Code flag
• no first-class typed wrapper yet for every Codex flag
• shared structured mode accepts dict-backed JSON Schema objects only
• Codex structured mode additionally enforces the OpenAI structured-output subset

For unsupported Claude Code flags, use RunOptions(extra_args=...). For unsupported Codex exec flags, use CodexRunOptions(extra_args=...); for unsupported Codex resume flags, use CodexRunOptions(resume_extra_args=...).

Development

pytest
mypy src tests