{
  "handle": "ExponentialBackoff",
  "mechanism": "A {{backoff}} delay policy whose unjittered delay grows geometrically across consecutive unsuccessful attempts: base_delay * multiplier^attempt_index. A configurable jitter factor may perturb the candidate delay to decorrelate concurrent attempts, after which the scheduled delay is clamped to max_delay. The caller defines retry eligibility, retry budget, and when the attempt sequence resets.",
  "gloss": "Geometrically increasing capped retry delay",
  "invariants": [
    "Scheduled delay is greater than zero and does not exceed max_delay.",
    "Before jitter, delay is non-decreasing with attempt_index until max_delay is reached."
  ],
  "parameters": [
    {
      "name": "base_delay",
      "type": "Duration",
      "range": "> 0",
      "description": "Delay before the first subsequent attempt"
    },
    {
      "name": "multiplier",
      "type": "Float",
      "range": "(1, unbounded)",
      "description": "Geometric growth factor applied per unsuccessful attempt"
    },
    {
      "name": "max_delay",
      "type": "Duration",
      "range": "[base_delay, unbounded)",
      "description": "Upper bound applied after optional jitter"
    },
    {
      "name": "jitter_factor",
      "type": "Float",
      "range": "[0.0, 1.0]",
      "description": "Proportional randomization of the candidate delay"
    }
  ],
  "failure_modes": [
    "Synchronized retries when jitter is zero or correlated across callers.",
    "Excessive recovery delay when the multiplier or cap is too large.",
    "Retry amplification when callers use the delay policy without a retry budget."
  ],
  "_meta": {
    "tier": 1,
    "ring": 0,
    "path": [
      "Infrastructure",
      "Primitives"
    ],
    "supersedes": [
      "sema:ExponentialBackoff#mh:SHA-256:a543a38722a0dfe96cf4bc7ccdaa615195ac058b5029651dc26d5cce1cd43128"
    ]
  },
  "sema_id": "sema:ExponentialBackoff#mh:SHA-256:f5e5ff69408a272184da86cf5698f6675e9dfe2aa47917616a695e117602b828",
  "sema_ref": "ExponentialBackoff#f5e5",
  "sema_stub": "f5e5",
  "extends": "sema:Backoff#mh:SHA-256:9e59718422f5408d7892feccb6d538a21103f9573b122b891ee3c8cf66303e72",
  "dependencies": {
    "references": {
      "backoff": "sema:Backoff#mh:SHA-256:9e59718422f5408d7892feccb6d538a21103f9573b122b891ee3c8cf66303e72"
    }
  },
  "sema_layer": "Infrastructure",
  "sema_category": "Primitives",
  "used_by": {
    "composes_with": {
      "Retry": "sema:Retry#mh:SHA-256:4f9fdfc5b1dafd31221e9426d62c02af80c6356ef5b446eddd3f50da961d1aa2"
    }
  }
}