{
  "handle": "ReAct",
  "mechanism": "An interleaved reasoning-action loop where the agent cycles through Thought (reason about the situation), Action (invoke a tool or take a step), and Observation (process the result). Unlike pure {{chain}}-of-Thought which reasons then answers, ReAct interleaves reasoning with environmental feedback, allowing the agent to adjust plans based on real-world results. It interleaves reasoning traces for a {{task}} with {{tool_invoke}} execution, updating the context with observation results.",
  "gloss": "Interleaved thought-action-observation cycle",
  "failure_modes": [
    "Observation Blindness: {{agent}} ignores observations and follows initial plan.",
    "{{loop}} Explosion: Endless thought-action cycles without termination.",
    "Action {{cognitive_bias}}: Jumping to actions without sufficient reasoning."
  ],
  "invariants": [
    "Action based on reasoning",
    "Cycle of Thought-Action-Observation"
  ],
  "preconditions": [
    "Environment access",
    "Goal"
  ],
  "postconditions": [
    "Goal reached or deemed impossible"
  ],
  "_meta": {
    "tier": 1,
    "related": [
      "sema:Reflexion#mh:SHA-256:c5b155b3053281ade32b43be8c274c6c0f1bb4315c3ec0313ce03c3c3ae97c76"
    ],
    "ring": 2,
    "supersedes": [
      "sema:ReAct#mh:SHA-256:b4879d75afcfc4c7fe1d0b48f3e65b7ad2953a9b8c2a236f2cf3a2b7f98c9688",
      "sema:ReAct#mh:SHA-256:c72018c3dbdfe960eadd257f10dfd88400a405cfd2be557977fc0e81bcae8062",
      "sema:ReAct#mh:SHA-256:bf894b5668550ecb0031e3f015d07aa7f6023bb9fa37d89c5982b67188797bfe",
      "sema:ReAct#mh:SHA-256:5281c82a8338b19ed33253f3447b6e845a967e6a28acb8c3efb63a6ab24ff308",
      "sema:ReAct#mh:SHA-256:23310635be1d832c320f40f2f954751ec909e9fc7ed85314946ccbb85ef8b524"
    ],
    "path": [
      "Mind",
      "Reasoning"
    ]
  },
  "sema_id": "sema:ReAct#mh:SHA-256:3361fd75537995da1d70c0f60b9b8bd01c44bad9e2596a81fa059b7c6c3fba83",
  "sema_ref": "ReAct#3361",
  "sema_stub": "3361",
  "dependencies": {
    "accepts": {
      "task": "sema:Task#mh:SHA-256:a85010f508f85055170c396c8fa390125c1206888c565ac10651f3969a339f8d"
    },
    "composes_with": {
      "tool_invoke": "sema:ToolInvoke#mh:SHA-256:1096039316801cc8ef6e2855a6300574bb8596bb8e57c2764fd3bee741fa217e"
    },
    "references": {
      "agent": "sema:Agent#mh:SHA-256:e127459069739fffc96a71d54ef6e8c97ca53471d5349c16aa72a092a33756cd",
      "chain": "sema:Chain#mh:SHA-256:3ba084dba5cf36bbdd43d03306c187ca75a2e3f448b555e257c26aab9b71c4fb",
      "cognitive_bias": "sema:CognitiveBias#mh:SHA-256:c8a4abe2e0ce048be16d25f890a50f8c7095e099b5ab2de23aa059942328f387",
      "loop": "sema:Loop#mh:SHA-256:37f953c0b21b9b0c72a639c4e1a54354faa71f07905531d271f6bbf40c341603"
    }
  },
  "sema_layer": "Mind",
  "sema_category": "Reasoning",
  "used_by": {
    "references": {
      "EventReact": "sema:EventReact#mh:SHA-256:4bad4fe25039564ac25139829244df5133e31cb65e5bd50ddbc953cad0082eb9"
    }
  }
}