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docs: document the 128 KiB size limit for Warp-managed secrets #441

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docs: document the 128 KiB size limit for Warp-managed secrets
oz-agent Jul 31, 2026
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Merge branch 'main' into docs/managed-secret-size-limit
hongyi-chen Jul 31, 2026
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8 changes: 8 additions & 0 deletions src/content/docs/platform/secrets.mdx
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Expand Up @@ -211,6 +211,14 @@ Today, secrets are provided as environment variables using the secret name as th
METABASE_API_KEY=********
```

#### Secret size limit

Because secrets are injected as environment variables, each one has to fit inside the operating system's per-variable limit of 128 KiB (131,072 bytes). Warp counts the full `NAME=value` string against that limit, so the usable value length is 128 KiB minus the secret's name, the `=` sign, and the terminating null byte.

@oz-for-oss oz-for-oss Bot Jul 31, 2026

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⚠️ [IMPORTANT] This points users to subtract the Warp secret's name, but typed secrets like AWS credentials are validated against generated env var names (AWS_ACCESS_KEY_ID, etc.), so the calculation can be wrong. Use the environment variable name instead.

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Because secrets are injected as environment variables, each one has to fit inside the operating system's per-variable limit of 128 KiB (131,072 bytes). Warp counts the full `NAME=value` string against that limit, so the usable value length is 128 KiB minus the secret's name, the `=` sign, and the terminating null byte.
Because secrets are injected as environment variables, each resulting `NAME=value` entry has to fit inside the operating system's per-variable limit of 128 KiB (131,072 bytes), including the terminating null byte. Warp counts the environment variable name, the `=` sign, the value, and that null byte against the limit, so the usable value length is slightly less than 128 KiB and depends on the environment variable name.


Warp validates the size when you create or update a secret, so an oversized value is rejected up front rather than failing partway through a run. Secrets that expand into several environment variables, such as AWS credentials, are validated per variable.

If you hit the limit, store the large payload somewhere the agent can fetch it at run time (an object store or a secrets manager the agent can call) and keep only the fetch credential in the Warp-managed secret.

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### Secret availability by trigger type
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