devin

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devin

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Identity

• Names: ai.cognition.devin; short alias devin.
• Native format: devin-cli-sessions-sqlite, session message forests and side-state tables.
• Session ID: sessions.id. Human-readable IDs are not proven globally unique; require a stable installation/profile namespace. node_id is unique only inside the session.
• Compaction: Row metadata summarized_from marks a continuation summary. Preserve a non-null parent_node_id; use summarized_from as logical parent only when native parent is empty. Exact history reinsertion is unqualified, so retain the old forest and unknown replacement range. compact/prior_node_ids is not proof of copies.

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Position basis

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Destinations

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devin: native facts without a standard field

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Links

• Tree and links: Fixture schema 17 uses parent_node_id, response key chat_message.metadata.request_id, injected marker is_system_prefix, and primary sessions.main_chain_id. A result inherits response identity only through a unique tool_call_id join. Apply the mechanical-sibling off-path check before exceptions. Foreground extensions["subagent/chain_node_id"] identifies another same-session head; it is not a child session. The stored subagent_heads.chain_node_id remains a lead until its writer contract is qualified.
• Lineage and order: No inter-session parent, child, copy or root mapping is qualified. Serialize message nodes by node_id, then ordered prompt/commit side logs, then mutable state. Missing/null primary heads do not authorize inventing a path. Message-native time takes precedence; row created_at is second-precision container time.

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Usage

• Inference and tools: Only a uniquely owned request_id supports an inference and its native metrics. Repeated IDs keep accounting native. Configuration does not prove served model. ACP tool_call_state snapshots revise a call/result only through its explicit unique call key; otherwise retain vendor state. Diff text is snippet precision unless whole-file scope is proved. Numeric signals remain raw.

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Lane and unassigned facts

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Losses

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Evidence

{
  "name": "ai.cognition.devin",
  "aliases": [
    "devin"
  ],
  "namespace": {
    "rule": "required"
  },
  "positions": [
    {
      "family": "transcript",
      "basis": "array-index",
      "boundary": "transaction"
    },
    {
      "family": "current-state",
      "basis": "snapshot",
      "boundary": "transaction"
    }
  ],
  "formats": [
    {
      "id": "devin-cli-sessions-sqlite",
      "evidence": [
        0,
        2
      ]
    }
  ],
  "evidence": [
    {
      "label": "third-party",
      "revision": "74f63227f1c7416607d704668f38b9c7c9de6a16",
      "scope": "format-and-explicit-mappings"
    },
    {
      "label": "authored",
      "scope": "converter-tests-only"
    },
    {
      "label": "capture",
      "version": "3000.4.25 and 3000.6.14, migrated by 3000.10.21",
      "scope": "schema 17 stored sessions; durable subagent heads authored only"
    }
  ],
  "destinations": {
    "call": {
      "schema": {
        "type": "object"
      },
      "evidence": [
        0
      ]
    },
    "diff": {
      "schema": {
        "type": "object"
      },
      "evidence": [
        0
      ]
    },
    "replacementParent": {
      "schema": {
        "type": "object"
      },
      "evidence": [
        0
      ]
    },
    "state": {
      "schema": {},
      "evidence": [
        0
      ]
    },
    "usage": {
      "schema": {
        "type": "object"
      },
      "evidence": [
        0
      ]
    }
  }
}