{
  "schema_version": 1,
  "id": "block-invisible-unicode",
  "track": "coding",
  "name": "Block Invisible Unicode",
  "version": "0.1.1",
  "sha256": "518f716868c54ba0207b09ce633758471cca37ad63a2d88c67f7be56836fa662",
  "sha256_v1": "b1084315706dc26e3097dd1c1a893c780415f1168ab5a995c19a895f93688c5a",
  "keyword": "block",
  "word": "blocks",
  "says": "blocks on an agent's file writes and at turn end",
  "description": "Blocks hidden Unicode in added lines: bidi, tag and plane-14 chars, word joiner, chained invisibles, zero-width/joiners/fillers by ASCII, mid-line BOM, LRM/RLM outside RTL text, selectors after ASCII, private-use runs of 16+. Allows emoji, RTL/Indic/Thai/CJK text, line-start BOM. Not caught: homoglyphs, a joiner between non-ASCII, binary files and text after U+2028 at commit. Runs: commit, agent write, turn's end. Waiver: 'pragma: allowlist invisible-unicode' same line; agent: HEAD only.",
  "misses": null,
  "where": [
    "write",
    "turn-end"
  ],
  "groups": [
    "prompt-injection"
  ],
  "eval_cases": 72,
  "eval_executed": 72,
  "latest": {
    "version": "0.1.1",
    "date": "2026-10-07",
    "change": "Promoted from draft to production: every test case ran and passed, and no bug report was open. Behaviour unchanged."
  },
  "agent_labels": {
    "claude-code": {
      "keyword": "block",
      "says": "blocks on an agent's file writes and at turn end"
    },
    "cursor": {
      "keyword": "block",
      "says": "blocks on an agent's file writes and at turn end"
    },
    "codex": {
      "keyword": "block",
      "says": "blocks on an agent's file writes and at turn end. If the hook errors, the action goes through (not witnessed; the vendor's row is only partly live-run)"
    },
    "copilot": {
      "keyword": "block",
      "says": "blocks at turn end only. It does not check a file write when it happens. If the hook errors, the action goes through (not witnessed; the vendor's row is only partly live-run)"
    },
    "devin": {
      "keyword": "block",
      "says": "blocks at turn end only. It does not check a file write when it happens. If the hook errors, the action goes through (vendor docs only, not witnessed)"
    },
    "grok": {
      "keyword": "ungraded",
      "says": "Not graded yet for Grok"
    },
    "goose": {
      "keyword": "ungraded",
      "says": "Not graded yet for goose"
    },
    "antigravity": {
      "keyword": "ungraded",
      "says": "Not graded yet for Antigravity"
    },
    "openhands": {
      "keyword": "ungraded",
      "says": "Not graded yet for OpenHands"
    },
    "kimi-code": {
      "keyword": "ungraded",
      "says": "Not graded yet for Kimi Code"
    },
    "factory-droid": {
      "keyword": "ungraded",
      "says": "Not graded yet for Factory Droid"
    }
  },
  "source_url": "https://github.com/open-coder-ai/chock-catalog/tree/1e60d211c1bb767152c6ab0167932da06ab3a10f/base/block-invisible-unicode",
  "enforces": "enforced-at-commit",
  "examples": [
    {
      "word": "Refused",
      "prompt": "A staged source file uses a right-to-left override to disguise code (Trojan Source).",
      "command": null
    },
    {
      "word": "Allowed",
      "prompt": "A staged file contains ordinary ASCII source code.",
      "command": null
    }
  ]
}