# 437 Queue Rate Limiting 6b7ef832

> Rate Limit Queue Execution

- Skill: `tools-only/437-queue-rate-limiting-6b7ef832` (Agent Skill, multi-file: 3 files)
- Install (CLI): `npx skillmds@latest add tools-only/437-queue-rate-limiting-6b7ef832`
- Raw SKILL.md: https://api.skillmd.com/api/skills/tools-only/437-queue-rate-limiting-6b7ef832/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Productivity
- Author: tools-only (https://skillmd.com/u/tools-only)
- Updated: 2026-09-22
- Page: https://skillmd.com/skills/tools-only/437-queue-rate-limiting-6b7ef832

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## Rate Limit Queue Execution

Use rate limits when working with rate-limited APIs (like LLM APIs). Limits are global across all processes.

**Incorrect (no rate limiting):**

```python
queue = Queue("llm_tasks")

@DBOS.step()
def call_llm(prompt):
    # May hit rate limits if too many calls
    return openai.chat.completions.create(...)
```

**Correct (with rate limit):**

```python
# Max 50 tasks started per 30 seconds
queue = Queue("llm_tasks", limiter={"limit": 50, "period": 30})

@DBOS.step()
def call_llm(prompt):
    return openai.chat.completions.create(...)

@DBOS.workflow()
def process_prompts(prompts):
    handles = []
    for prompt in prompts:
        # Queue enforces rate limit
        handle = queue.enqueue(call_llm, prompt)
        handles.append(handle)
    return [h.get_result() for h in handles]
```

Rate limit parameters:
- `limit`: Maximum number of functions to start in the period
- `period`: Time period in seconds

Rate limits can be combined with concurrency limits:

```python
queue = Queue("api_tasks",
    worker_concurrency=5,
    limiter={"limit": 100, "period": 60})
```

Reference: [Rate Limiting](https://docs.dbos.dev/python/tutorials/queue-tutorial#rate-limiting)