docs: update security.md for Redis rate-limit backend and token logging
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Abhimanyu Saharan
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@@ -17,14 +17,21 @@ Set any `SECURITY_HEADER_*` variable to blank to disable that header.
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## Rate limiting
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Per-IP rate limits are enforced in-memory on sensitive endpoints:
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Per-IP rate limits are enforced on sensitive endpoints:
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| Endpoint | Limit | Window | Status on exceed |
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| --- | --- | --- | --- |
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| Agent authentication (`X-Agent-Token`) | 20 requests | 60 seconds | `429` |
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| Webhook ingest (`POST .../webhooks/{id}`) | 60 requests | 60 seconds | `429` |
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These limits are per-process. In multi-process deployments, also apply rate limiting at the reverse proxy layer.
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Two backends are supported, selected via `RATE_LIMIT_BACKEND`:
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| Backend | Value | Notes |
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| --- | --- | --- |
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| In-memory (default) | `memory` | Per-process only; no external dependencies. Suitable for single-worker or dev setups. |
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| Redis | `redis` | Shared across workers/processes. Set `RATE_LIMIT_REDIS_URL` or it falls back to `RQ_REDIS_URL`. Redis connectivity is validated at startup. |
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The Redis backend fails open — if Redis becomes unreachable during a request, the request is allowed and a warning is logged. In multi-process deployments without Redis, also apply rate limiting at the reverse proxy layer.
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## Webhook HMAC verification
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@@ -65,7 +72,7 @@ This boundary helps LLM-based agents distinguish trusted instructions from untru
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## Agent token logging
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Agent tokens are **not logged** on authentication failure — not even partially. This prevents token leakage via server logs. When debugging agent auth issues, verify the token value at the source.
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On authentication failure, only a short prefix of the presented token is logged to aid debugging. Full tokens are never written to logs.
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## Cross-tenant isolation
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