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When Nous returns a 429, the retry amplification chain burns up to 9 API requests per conversation turn (3 SDK retries × 3 Hermes retries), each counting against RPH and deepening the rate limit. With multiple concurrent sessions (cron + gateway + auxiliary), this creates a spiral where retries keep the limit tapped indefinitely. New module: agent/nous_rate_guard.py - Shared file-based rate limit state (~/.hermes/rate_limits/nous.json) - Parses reset time from x-ratelimit-reset-requests-1h, x-ratelimit- reset-requests, retry-after headers, or error context - Falls back to 5-minute default cooldown if no header data - Atomic writes (tempfile + rename) for cross-process safety - Auto-cleanup of expired state files run_agent.py changes: - Top-of-retry-loop guard: when another session already recorded Nous as rate-limited, skip the API call entirely. Try fallback provider first, then return a clear message with the reset time. - On 429 from Nous: record rate limit state and skip further retries (sets retry_count = max_retries to trigger fallback path) - On success from Nous: clear the rate limit state so other sessions know they can resume auxiliary_client.py changes: - _try_nous() checks rate guard before attempting Nous in the auxiliary fallback chain. When rate-limited, returns (None, None) so the chain skips to the next provider instead of piling more requests onto Nous. This eliminates three sources of amplification: 1. Hermes-level retries (saves 6 of 9 calls per turn) 2. Cross-session retries (cron + gateway all skip Nous) 3. Auxiliary fallback to Nous (compression/session_search skip too) Includes 24 tests covering the rate guard module, header parsing, state lifecycle, and auxiliary client integration.