{
  "node": {
    "id": "block:native-invocation-feedback",
    "type": "Block",
    "label": "Invocation feedback kernel",
    "properties": {
      "id": "native-invocation-feedback",
      "name": "Invocation feedback kernel",
      "kind": "studio",
      "summary": "Each call reads the previous held result, runs one child and commits its new result before the next call at the same timestamp.",
      "behavior": "Each call reads the previous held result, runs one child and commits its new result before the next call at the same timestamp. Outputs are held between accepted samples; numerical evaluation does not commit hidden state.",
      "ports": [
        {
          "name": "in0",
          "direction": "input",
          "unit": "—",
          "description": "Calls; u32 scalar."
        },
        {
          "name": "out0",
          "direction": "output",
          "unit": "—",
          "description": "Biased value; real scalar."
        },
        {
          "name": "out1",
          "direction": "output",
          "unit": "—",
          "description": "Invocations this sample; u32 scalar."
        }
      ],
      "parameters": [
        {
          "key": "sampleTimeS",
          "label": "Sample period",
          "unit": "s",
          "default": 1,
          "min": 0,
          "description": "Positive interval between accepted control samples. Outputs hold between these instants."
        },
        {
          "key": "params[0]",
          "label": "Maximum calls per sample",
          "unit": "—",
          "default": 16,
          "description": "1–256; the initial output is the first feedback snapshot."
        },
        {
          "key": "nested",
          "label": "Child operation",
          "unit": "—",
          "default": "Bias",
          "description": "One configurable native computation operation. Its declared input/output types must match the wrapper."
        },
        {
          "key": "tables[0]",
          "label": "Initial held outputs",
          "unit": "—",
          "default": [
            0
          ],
          "description": "Initial values for all child output lanes, in output order. For independent elements, supply one value per element."
        }
      ],
      "equations": [
        "For each call: output ← child(state, previous output)",
        "The initial held output is the first feedback input"
      ],
      "example": {
        "title": "Invocation feedback kernel worked example",
        "text": "Default editable example at the first accepted sample (t = 0 s). Child operation: bias. The output checks below are execution oracles for this example.",
        "url": "https://design.lemonergy.com/cosim.html?example=block-native-invocation-feedback",
        "label": "Open Studio example",
        "inputs": [
          {
            "port": "in0",
            "label": "Calls",
            "value": 3,
            "unit": "—"
          }
        ],
        "checks": [
          {
            "port": "out0",
            "label": "Biased value",
            "atS": 0,
            "value": 3,
            "unit": "—",
            "tolerance": 1e-08
          },
          {
            "port": "out1",
            "label": "Invocations this sample",
            "atS": 0,
            "value": 3,
            "unit": "—",
            "tolerance": 1e-08
          }
        ]
      },
      "limits": [
        "Control executes on an explicit sampled clock. Continuous states, history/delay kernels, residual equations, and event-source children are not supported.",
        "The wrapper contains one original computation operation; arbitrary multi-block submodels are not supported.",
        "A sampled child advances once per invocation using its own declared period. Repeated calls share the same outer timestamp and do not advance physical time.",
        "One explicit child and one matching input/output port; no global function namespace or arbitrary feedback subgraph. At most 256 calls per sample."
      ],
      "references": [
        "control-dataflow"
      ],
      "availability": {
        "status": "released",
        "label": "Available in Lemonergy Studio",
        "detail": "The bundled example is available in the production release verified on 28 October 2026. The parameters and examples here are synthetic teaching fixtures, not a characterized cell or a validated operating limit."
      },
      "evidence": [
        "docs/glossary/native-block-verification.json"
      ],
      "sourceRepository": "Lemonergy Studio public contract",
      "sourceRevision": "verification-2026-10-27",
      "caseIds": [
        "native-native-invocation-feedback"
      ],
      "exampleTraces": [
        {
          "id": "native-invocation-feedback",
          "url": "https://lemonergy.com/learn/glossary/api/traces/native-invocation-feedback.json?v=050b1e74be80",
          "title": "Invocation feedback kernel recorded example",
          "exampleId": "block-native-invocation-feedback",
          "source": "Executed synthetic Lemonergy Studio example",
          "recordedOn": "2026-10-28",
          "points": 3,
          "channels": 2,
          "omittedChannels": 0,
          "interpolation": "step",
          "solver": {
            "method": "dormand-prince-45",
            "reason": "no-continuous-states"
          }
        }
      ],
      "type": "native-invocation-feedback",
      "implementationId": "native-invocation-feedback",
      "url": "https://lemonergy.com/learn/glossary/blocks/native-invocation-feedback/",
      "documentationUrl": "https://lemonergy.com/learn/glossary/blocks/native-invocation-feedback/",
      "sourceFile": "block-library.json",
      "reviewed": "2026-10-27",
      "releaseEvidence": {
        "environment": "production",
        "status": "verified",
        "revision": "e76cadfc203e15eb41f3478d8b1044a5b851953d",
        "verifiedOn": "2026-10-28",
        "exampleUrls": [
          "https://design.lemonergy.com/cosim.html?example=block-native-invocation-feedback"
        ]
      }
    }
  },
  "incoming": [
    {
      "id": "edge:usesBlock/native-native-invocation-feedback/0",
      "type": "usesBlock",
      "source": "workflow:native-native-invocation-feedback",
      "target": "block:native-invocation-feedback",
      "properties": {
        "sourceFile": "wiki-blocks.json",
        "position": 0,
        "name": "Invocation feedback kernel",
        "type": "native-invocation-feedback",
        "role": "Each call reads the previous held result, runs one child and commits its new result before the next call at the same timestamp. Outputs are held between accepted samples; numerical evaluation does not commit hidden state.",
        "settings": [
          "Use the block reference for settings and connections.",
          "Bundled example verified on the production release of 28 October 2026."
        ]
      }
    }
  ],
  "outgoing": [
    {
      "id": "edge:cites/block:native-invocation-feedback/reference:control-dataflow",
      "type": "cites",
      "source": "block:native-invocation-feedback",
      "target": "reference:control-dataflow",
      "properties": {
        "sourceFile": "block-library.json",
        "scope": "Scientific or mathematical background; implementation scope is stated by the block contract"
      }
    }
  ],
  "neighbors": [
    {
      "id": "workflow:native-native-invocation-feedback",
      "type": "Workflow",
      "label": "Invocation feedback kernel worked example",
      "properties": {
        "id": "native-native-invocation-feedback",
        "title": "Invocation feedback kernel worked example",
        "kind": "studio",
        "summary": "Each call reads the previous held result, runs one child and commits its new result before the next call at the same timestamp.",
        "steps": [
          "Review the interface, units and model limits.",
          "Open the Studio example and run its bundled model.",
          "Compare outputs with the numerical checks; change one input and run again."
        ],
        "example": "Default editable example at the first accepted sample (t = 0 s). Child operation: bias. The output checks below are execution oracles for this example.",
        "observe": "Inspect the output channels and checks on the block reference page.",
        "limits": "Control executes on an explicit sampled clock. Continuous states, history/delay kernels, residual equations, and event-source children are not supported. The wrapper contains one original computation operation; arbitrary multi-block submodels are not supported. A sampled child advances once per invocation using its own declared period. Repeated calls share the same outer timestamp and do not advance physical time. One explicit child and one matching input/output port; no global function namespace or arbitrary feedback subgraph. At most 256 calls per sample.",
        "url": "https://design.lemonergy.com/cosim.html?example=block-native-invocation-feedback",
        "label": "Open Studio example",
        "evidence": [
          "docs/glossary/native-block-verification.json"
        ]
      }
    },
    {
      "id": "reference:control-dataflow",
      "type": "Reference",
      "label": "Synchronous Data Flow",
      "properties": {
        "title": "Synchronous Data Flow",
        "authors": [
          "Edward A. Lee",
          "David G. Messerschmitt"
        ],
        "year": 1987,
        "url": "https://ptolemy.berkeley.edu/publications/papers/87/index.htm",
        "publisher": "Proceedings of the IEEE, 75(9), 1235–1245",
        "type": "Research article",
        "scope": "Background on actor firing and explicit dataflow. The sampled conditional semantics documented here are Lemonergy design choices, not a claim of a complete SDF implementation.",
        "accessed": "2026-10-27"
      }
    }
  ]
}