> ## Documentation Index
> Fetch the complete documentation index at: https://e2b-automation-sdk-reference-sync.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Limits

> Size, count, and pagination limits that apply to stored secrets.

* A secret value can be up to **64 KiB**, measured in UTF-8 bytes. Exceeding the limit fails with a `400` error. Values used in headers must also be valid HTTP header values.
* A project can hold up to **100** secrets. Exceeding the limit fails with a `409` error.
* The network rules for one host can reference up to **32** distinct secret names after lowercasing. Repeated references to the same name count once. Exceeding the limit fails network-rule validation with a `400` error.
* A request can resolve up to **256 KiB** of secret values in total, counting each distinct name once. References that exceed this budget cannot be resolved, so their headers are omitted.
* Secret metadata supports up to **32** entries, with keys up to **128 bytes**, values up to **1,024 bytes**, and **8 KiB** in total across all keys and values. Exceeding these limits returns `400`.
* `Secret.list` returns up to **100** entries per page by default. Use `Secret.list({ limit: 50 })` in JavaScript or `Secret.list(limit=50)` in Python for smaller pages. Metadata filtering is not supported.