# Em 0018

- Object ID: `em:task:sha256:81f65a82e78ea0ecb1186131d64e279408657a2cb7053dfb6ba3a2071e9b9e91`
- Kind: `task`
- Repository path: [`tasks/contracts/EM-0018.json`](https://github.com/yoheinakajima/epistemedia/blob/f92846570180dfa4511263f8ba98ecd18f7772c9/tasks/contracts/EM-0018.json)
- Content digest: `fe8008dbd1d80cdd48ba3e04d41e405fbfa94e8d131b880709f1192aea0b873c`

**Also filed under:** [Agent Operations](https://epistemedia.org/topics/agent-operations/), [Research Program](https://epistemedia.org/topics/research-program/)

## Source content

{
  "$schema": "https://epistemedia.com/schemas/task-contract-v1.json",
  "id": "EM-0018",
  "title": "Implement a reversible claim-dossier model",
  "status": "ready",
  "change_class": "ordinary-implementation",
  "objective": "Implement a deliberately application-level, reversible dossier format sufficient to represent one How We Know vertical slice with source works, editions, exact spans, propositions, assertions, evidence relations, dependence, and claim families without prematurely declaring a stable protocol ontology.",
  "depends_on": [
    "EM-0016"
  ],
  "authority": {
    "allowed_paths": [
      "catalog/dossiers/**",
      "src/**",
      "tests/**",
      "docs/**",
      "research/**",
      "ops/**",
      "runs/**"
    ],
    "forbidden_paths": [
      "constitution/**",
      "policies/**",
      "schemas/**",
      "governance/events/**",
      ".github/**",
      "tasks/contracts/**"
    ]
  },
  "required_evaluation": [
    "strict dossier validation and content-addressing tests",
    "source-span bounds and digest verification",
    "referential-closure and missing-dependency rejection tests",
    "dependence-cycle and unknown-lineage handling tests",
    "private-only mutation noninterference tests",
    "cross-interface identity parity tests"
  ],
  "acceptance": [
    "source work identity is distinct from the exact edition or snapshot examined",
    "every represented source span names its edition, locator, exact quoted or structured extent, and digest",
    "propositions are distinct from actor assertions and policy-relative evaluations",
    "support, rebuttal, qualification, undercutting, replication, and dependence remain representable",
    "unknown lineage is explicit and earns no automatic independence credit",
    "no dossier object contains an intrinsic global truth or confidence field",
    "invalid spans, dangling relations, duplicate stable IDs, and malformed dependence references fail closed",
    "HTML, Markdown, JSON, API, MCP, and CLI adapters can consume one disclosure-safe dossier identity",
    "make check passes without changing accepted source state"
  ],
  "limitations": [
    "The dossier format is an alpha application contract, not an accepted replacement for the normative event envelope or a universal ontology.",
    "Promotion into schemas or protocol guarantees requires a later protocol-normative task with independent evaluation and compatibility analysis.",
    "This task provides validated structure and fixtures; it does not admit public empirical or philosophical conclusions."
  ]
}