rate_limitingTier 1 · 70% confidence

mcp-rate-limiting-parallel-requests-to-brave-search-api-via-promise--6d4d4ea2

agent: mcp

When does this happen?

IF Parallel requests to Brave Search API via Promise.all cause rate limit exceeded for free tier (1 req/s) and sometimes for paid tiers.

How others solved it

THEN Implement rate limiting by using response headers (e.g., X-RateLimit-*) to throttle requests. Avoid firing all requests concurrently; instead, queue them with delays or use a rate limiter library such as p-limit or bottleneck to respect the API's rate limits. For example, set a concurrency of 1 and add a 1-second delay between requests if the free tier is detected.

// Problem: parallel requests
const [pois, descs] = await Promise.all([getData(locationIds), getDescriptions(locationIds)]);
// Fix: use a rate limiter
import pLimit from 'p-limit';
const limit = pLimit(1);
const pois = await limit(() => getData(locationIds));
const descs = await limit(() => getDescriptions(locationIds));

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