{
 "measurement": "Does a large node_modules cost context, and does .claudeignore do anything",
 "claude_code_version": "2.1.229 (Claude Code)",
 "claim_under_test": "From circulating cost-optimisation guides: \"Add a .claudeignore to prevent Claude Code from reading unnecessary files. Without .claudeignore, Claude Code reads node_modules, dist folders, and binaries when indexing.\"",
 "documentation_check": "The string 'claudeignore' appears in 0 of the 193 pages listed in the official documentation index at code.claude.com/docs/llms.txt. 'CLAUDE.md' appears in 8, which is the positive control proving the search worked rather than the fetch being empty.",
 "method": {
  "fixture": "A small Node project (package.json, README, three source files). The bloated arms add a synthetic node_modules of 1,960 files and 7.9 MB across 140 packages, each with a package.json, a LICENSE and twelve minified chunk/map files. Measured on disk per run and published as tree.",
  "arms": "LEAN is the project alone. BLOATED adds the node_modules. BLOATED_IGNORED adds a .claudeignore naming node_modules/, dist/ and *.bin.",
  "probes": {
   "startup": "\"Reply with only READY.\" It asks for nothing, so any cost above LEAN is startup behaviour rather than the model choosing to look.",
   "explore": "\"What does this project do? Answer in one sentence.\" This invites looking, which is where the claim would actually bite."
  },
  "canary_probe": "A file node_modules/pkg-000/SECRET.txt containing CANARY-7731, then the model is asked to read it and reply with only its contents. Three arms: no protection, .claudeignore, and the documented alternative, a settings.json permissions.deny rule Read(./node_modules/**). Three rounds each. This separates 'honoured but nothing to exclude' from 'inert', which the token measurement alone cannot do.",
  "controls": {
   "bloat_arrival": "The bloat is measured on disk per run and published (files, megabytes, node_modules files, node_modules megabytes). Without it, 'no effect' is indistinguishable from 'no node_modules'.",
   "ignore_arrival": "The .claudeignore is written and its sha256 recorded per run, so a null result cannot be an unwritten file.",
   "canary_arrival": "Each canary round re-checks that the secret is on disk and that the arm's config file was actually written, before asking.",
   "action_record": "--output-format stream-json, so whether node_modules was ever touched is observed rather than inferred.",
   "isolation": "--setting-sources project on every invocation, asserted onto the command line.",
   "tokens": "modelUsage, not .usage."
  },
  "known_limits": {
   "explore_probe_is_underpowered": "The explore probe is dominated by turn-count variance, not by the arm. Turn counts were lean [5,5,6,8], bloated [5,5,5,5], ignored [3,6,9,9], and context tracks those rather than the treatment. It therefore CANNOT detect a small effect of .claudeignore, and the arm differences in that probe (bloated reading 14.6% BELOW lean) are noise and must not be read as an effect in either direction. The startup probe and the canary probe carry the findings.",
   "one_project_shape": "One small Node project and one synthetic node_modules. The startup result should hold for any repository size because nothing is read at startup, but that is an inference beyond the 7.9 MB actually tested.",
   "canary_is_a_capability_test": "The canary probe asks whether a file CAN be read when asked directly. It does not measure how often the model would choose to read node_modules unprompted; the 24 token runs speak to that, and touched it zero times.",
   "what_the_corpus_cannot_see": "Two quantities are measured: context tokens from modelUsage, and the model's own tool calls from stream-json. Neither can observe what the CLI touches on disk before the first turn. So this corpus supports 'no indexing step reaches the context' and does NOT support 'nothing is read at startup'. The distinction matters because the corpus itself hints the other way: bloated_ignored sits +10 tokens above lean in 4 of 4 rounds and +8 above bloated, while the .claudeignore body is 26 bytes, roughly 8 tokens. That is equally consistent with the file being read and disregarded, or with its name merely appearing in a directory listing. Either way it changes no behaviour, which is what the canary probe establishes independently.",
   "explore_behaviour_is_not_uniform": "All 12 explore runs listed the directory and read README.md and package.json. Beyond that they differ: 7 opened no source file, 2 opened one, 3 opened all three. The bloated_ignored arm opened the .claudeignore itself in 4 of 4. Only the node_modules count is uniform across all 12, at zero. Any sentence describing 'what the model did' in this probe must be stated as a distribution, not as a single sequence."
  },
  "redaction": "Replies and tool-call arguments have every path-shaped token reduced to its basename, or to <redacted-local-path> where the basename itself was identifying. No measured value is altered."
 },
 "fixture_probe": {
  "files": 1966,
  "megabytes": 7.91,
  "node_modules_files": 1960,
  "node_modules_megabytes": 7.9
 },
 "claudeignore_body": "node_modules/\ndist/\n*.bin\n",
 "prompts": {
  "startup": "Reply with only READY.",
  "explore": "What does this project do? Answer in one sentence."
 },
 "token_runs": [
  {
   "probe": "startup",
   "arm": "lean",
   "round": 0,
   "status": "ok",
   "fixture_ok": true,
   "tree": {
    "files": 5,
    "megabytes": 0.0,
    "node_modules_files": 0,
    "node_modules_megabytes": 0.0
   },
   "claudeignore_sha256": null,
   "wall": 3.2,
   "context": 22401,
   "output": 17,
   "turns": 1,
   "cost": 0.067715,
   "tool_calls": [],
   "n_tool_calls": 0,
   "touched_node_modules": 0,
   "touches": [],
   "reply": "READY."
  },
  {
   "probe": "startup",
   "arm": "bloated",
   "round": 0,
   "status": "ok",
   "fixture_ok": true,
   "tree": {
    "files": 1965,
    "megabytes": 7.91,
    "node_modules_files": 1960,
    "node_modules_megabytes": 7.9
   },
   "claudeignore_sha256": null,
   "wall": 3.8,
   "context": 22403,
   "output": 18,
   "turns": 1,
   "cost": 0.06774000000000001,
   "tool_calls": [],
   "n_tool_calls": 0,
   "touched_node_modules": 0,
   "touches": [],
   "reply": "READY."
  },
  {
   "probe": "startup",
   "arm": "bloated_ignored",
   "round": 0,
   "status": "ok",
   "fixture_ok": true,
   "tree": {
    "files": 1966,
    "megabytes": 7.91,
    "node_modules_files": 1960,
    "node_modules_megabytes": 7.9
   },
   "claudeignore_sha256": "fe0828024ad385ada1a9150a4c44247694ad5dc956552bec6c02ac7d9443028c",
   "wall": 4.7,
   "context": 22411,
   "output": 17,
   "turns": 1,
   "cost": 0.067815,
   "tool_calls": [],
   "n_tool_calls": 0,
   "touched_node_modules": 0,
   "touches": [],
   "reply": "READY."
  },
  {
   "probe": "explore",
   "arm": "lean",
   "round": 0,
   "status": "ok",
   "fixture_ok": true,
   "tree": {
    "files": 5,
    "megabytes": 0.0,
    "node_modules_files": 0,
    "node_modules_megabytes": 0.0
   },
   "claudeignore_sha256": null,
   "wall": 11.8,
   "context": 67793,
   "output": 668,
   "turns": 5,
   "cost": 0.11872400000000002,
   "tool_calls": [
    {
     "tool": "Bash",
     "arg": "ls -la explore_lean_0"
    },
    {
     "tool": "Read",
     "arg": "README.md"
    },
    {
     "tool": "Read",
     "arg": "package.json"
    },
    {
     "tool": "Bash",
     "arg": "find src -type f | head -50"
    }
   ],
   "n_tool_calls": 4,
   "touched_node_modules": 0,
   "touches": [],
   "reply": "**invoice-tool** reads a CSV of billable line items and renders them into PDF invoices (via pdfkit), with `parse.js` handling the CSV and `render.js` the PDF output."
  },
  {
   "probe": "explore",
   "arm": "bloated",
   "round": 0,
   "status": "ok",
   "fixture_ok": true,
   "tree": {
    "files": 1965,
    "megabytes": 7.91,
    "node_modules_files": 1960,
    "node_modules_megabytes": 7.9
   },
   "claudeignore_sha256": null,
   "wall": 11.7,
   "context": 67877,
   "output": 635,
   "turns": 5,
   "cost": 0.11831900000000001,
   "tool_calls": [
    {
     "tool": "Bash",
     "arg": "ls -la explore_bloated_0"
    },
    {
     "tool": "Read",
     "arg": "README.md"
    },
    {
     "tool": "Read",
     "arg": "package.json"
    },
    {
     "tool": "Bash",
     "arg": "find src -type f | head -50"
    }
   ],
   "n_tool_calls": 4,
   "touched_node_modules": 0,
   "touches": [],
   "reply": "It reads a CSV of billable line items and renders them into PDF invoices (via pdfkit)."
  },
  {
   "probe": "explore",
   "arm": "bloated_ignored",
   "round": 0,
   "status": "ok",
   "fixture_ok": true,
   "tree": {
    "files": 1966,
    "megabytes": 7.91,
    "node_modules_files": 1960,
    "node_modules_megabytes": 7.9
   },
   "claudeignore_sha256": "fe0828024ad385ada1a9150a4c44247694ad5dc956552bec6c02ac7d9443028c",
   "wall": 18.9,
   "context": 115382,
   "output": 1269,
   "turns": 9,
   "cost": 0.1678405,
   "tool_calls": [
    {
     "tool": "Bash",
     "arg": "ls -la explore_bloated_ignored_0"
    },
    {
     "tool": "Read",
     "arg": "README.md"
    },
    {
     "tool": "Read",
     "arg": "package.json"
    },
    {
     "tool": "Read",
     "arg": ".claudeignore"
    },
    {
     "tool": "Bash",
     "arg": "find src -type f | head -50"
    },
    {
     "tool": "Read",
     "arg": "index.js"
    },
    {
     "tool": "Read",
     "arg": "parse.js"
    },
    {
     "tool": "Read",
     "arg": "render.js"
    }
   ],
   "n_tool_calls": 8,
   "touched_node_modules": 0,
   "touches": [],
   "reply": "It's `invoice-tool` \u2014 a small Node library that parses a CSV of billable lines (description, quantity, unit price) and renders them into a PDF invoice with a computed total, though the current `render.js` is a stub that just returns totals rather than actually writing a PDF via its `pdfkit` dependency."
  },
  {
   "probe": "startup",
   "arm": "lean",
   "round": 1,
   "status": "ok",
   "fixture_ok": true,
   "tree": {
    "files": 5,
    "megabytes": 0.0,
    "node_modules_files": 0,
    "node_modules_megabytes": 0.0
   },
   "claudeignore_sha256": null,
   "wall": 3.3,
   "context": 22401,
   "output": 17,
   "turns": 1,
   "cost": 0.067715,
   "tool_calls": [],
   "n_tool_calls": 0,
   "touched_node_modules": 0,
   "touches": [],
   "reply": "READY."
  },
  {
   "probe": "startup",
   "arm": "bloated",
   "round": 1,
   "status": "ok",
   "fixture_ok": true,
   "tree": {
    "files": 1965,
    "megabytes": 7.91,
    "node_modules_files": 1960,
    "node_modules_megabytes": 7.9
   },
   "claudeignore_sha256": null,
   "wall": 3.6,
   "context": 22403,
   "output": 16,
   "turns": 1,
   "cost": 0.06773,
   "tool_calls": [],
   "n_tool_calls": 0,
   "touched_node_modules": 0,
   "touches": [],
   "reply": "READY."
  },
  {
   "probe": "startup",
   "arm": "bloated_ignored",
   "round": 1,
   "status": "ok",
   "fixture_ok": true,
   "tree": {
    "files": 1966,
    "megabytes": 7.91,
    "node_modules_files": 1960,
    "node_modules_megabytes": 7.9
   },
   "claudeignore_sha256": "fe0828024ad385ada1a9150a4c44247694ad5dc956552bec6c02ac7d9443028c",
   "wall": 3.1,
   "context": 22411,
   "output": 15,
   "turns": 1,
   "cost": 0.067805,
   "tool_calls": [],
   "n_tool_calls": 0,
   "touched_node_modules": 0,
   "touches": [],
   "reply": "READY."
  },
  {
   "probe": "explore",
   "arm": "lean",
   "round": 1,
   "status": "ok",
   "fixture_ok": true,
   "tree": {
    "files": 5,
    "megabytes": 0.0,
    "node_modules_files": 0,
    "node_modules_megabytes": 0.0
   },
   "claudeignore_sha256": null,
   "wall": 15.0,
   "context": 91186,
   "output": 832,
   "turns": 6,
   "cost": 0.136912,
   "tool_calls": [
    {
     "tool": "Bash",
     "arg": "ls -la explore_lean_1"
    },
    {
     "tool": "Read",
     "arg": "README.md"
    },
    {
     "tool": "Read",
     "arg": "package.json"
    },
    {
     "tool": "Bash",
     "arg": "find src -type f | head -50"
    },
    {
     "tool": "Read",
     "arg": "index.js"
    }
   ],
   "n_tool_calls": 5,
   "touched_node_modules": 0,
   "touches": [],
   "reply": "`invoice-tool` is a small Node.js library that parses a CSV of billable line items and renders them into a PDF invoice via pdfkit (`parse.js` \u2192 `render.js`, wired together in `<redacted-local-path>`)."
  },
  {
   "probe": "explore",
   "arm": "bloated",
   "round": 1,
   "status": "ok",
   "fixture_ok": true,
   "tree": {
    "files": 1965,
    "megabytes": 7.91,
    "node_modules_files": 1960,
    "node_modules_megabytes": 7.9
   },
   "claudeignore_sha256": null,
   "wall": 11.9,
   "context": 67881,
   "output": 642,
   "turns": 5,
   "cost": 0.118555,
   "tool_calls": [
    {
     "tool": "Bash",
     "arg": "ls -la explore_bloated_1"
    },
    {
     "tool": "Read",
     "arg": "README.md"
    },
    {
     "tool": "Read",
     "arg": "package.json"
    },
    {
     "tool": "Bash",
     "arg": "find src -type f | head -50"
    }
   ],
   "n_tool_calls": 4,
   "touched_node_modules": 0,
   "touches": [],
   "reply": "`invoice-tool` reads a CSV of billable line items and renders them into PDF invoices (via pdfkit)."
  },
  {
   "probe": "explore",
   "arm": "bloated_ignored",
   "round": 1,
   "status": "ok",
   "fixture_ok": true,
   "tree": {
    "files": 1966,
    "megabytes": 7.91,
    "node_modules_files": 1960,
    "node_modules_megabytes": 7.9
   },
   "claudeignore_sha256": "fe0828024ad385ada1a9150a4c44247694ad5dc956552bec6c02ac7d9443028c",
   "wall": 11.8,
   "context": 67325,
   "output": 457,
   "turns": 3,
   "cost": 0.107798,
   "tool_calls": [
    {
     "tool": "Bash",
     "arg": "ls -la explore_bloated_ignored_1"
    },
    {
     "tool": "Bash",
     "arg": "cat README.md package.json .claudeignore && find src -type f | head -50"
    }
   ],
   "n_tool_calls": 2,
   "touched_node_modules": 0,
   "touches": [],
   "reply": "This project (`invoice-tool` v1.2.0) generates PDF invoices from a CSV of billable lines, using pdfkit with source split across parsing (`parse.js`), rendering (`render.js`), and an entry point (`index.js`)."
  },
  {
   "probe": "startup",
   "arm": "lean",
   "round": 2,
   "status": "ok",
   "fixture_ok": true,
   "tree": {
    "files": 5,
    "megabytes": 0.0,
    "node_modules_files": 0,
    "node_modules_megabytes": 0.0
   },
   "claudeignore_sha256": null,
   "wall": 3.0,
   "context": 22401,
   "output": 18,
   "turns": 1,
   "cost": 0.06772,
   "tool_calls": [],
   "n_tool_calls": 0,
   "touched_node_modules": 0,
   "touches": [],
   "reply": "READY."
  },
  {
   "probe": "startup",
   "arm": "bloated",
   "round": 2,
   "status": "ok",
   "fixture_ok": true,
   "tree": {
    "files": 1965,
    "megabytes": 7.91,
    "node_modules_files": 1960,
    "node_modules_megabytes": 7.9
   },
   "claudeignore_sha256": null,
   "wall": 3.2,
   "context": 21881,
   "output": 5,
   "turns": 1,
   "cost": 0.067153,
   "tool_calls": [],
   "n_tool_calls": 0,
   "touched_node_modules": 0,
   "touches": [],
   "reply": "READY."
  },
  {
   "probe": "startup",
   "arm": "bloated_ignored",
   "round": 2,
   "status": "ok",
   "fixture_ok": true,
   "tree": {
    "files": 1966,
    "megabytes": 7.91,
    "node_modules_files": 1960,
    "node_modules_megabytes": 7.9
   },
   "claudeignore_sha256": "fe0828024ad385ada1a9150a4c44247694ad5dc956552bec6c02ac7d9443028c",
   "wall": 3.6,
   "context": 22411,
   "output": 17,
   "turns": 1,
   "cost": 0.067815,
   "tool_calls": [],
   "n_tool_calls": 0,
   "touched_node_modules": 0,
   "touches": [],
   "reply": "READY."
  },
  {
   "probe": "explore",
   "arm": "lean",
   "round": 2,
   "status": "ok",
   "fixture_ok": true,
   "tree": {
    "files": 5,
    "megabytes": 0.0,
    "node_modules_files": 0,
    "node_modules_megabytes": 0.0
   },
   "claudeignore_sha256": null,
   "wall": 16.8,
   "context": 91727,
   "output": 1130,
   "turns": 8,
   "cost": 0.149772,
   "tool_calls": [
    {
     "tool": "Bash",
     "arg": "ls -la explore_lean_2"
    },
    {
     "tool": "Read",
     "arg": "README.md"
    },
    {
     "tool": "Read",
     "arg": "package.json"
    },
    {
     "tool": "Bash",
     "arg": "find src -type f | head -50"
    },
    {
     "tool": "Read",
     "arg": "index.js"
    },
    {
     "tool": "Read",
     "arg": "parse.js"
    },
    {
     "tool": "Read",
     "arg": "render.js"
    }
   ],
   "n_tool_calls": 7,
   "touched_node_modules": 0,
   "touches": [],
   "reply": "`invoice-tool` parses a CSV of billable lines (description, quantity, unit price) and renders them into a PDF invoice with a computed total \u2014 though as it stands, `render.js` is a stub that just returns `{outPath, total, count}` rather than actually writing a PDF, and `index.js` passes a file path where `parseCsv` expects CSV text."
  },
  {
   "probe": "explore",
   "arm": "bloated",
   "round": 2,
   "status": "ok",
   "fixture_ok": true,
   "tree": {
    "files": 1965,
    "megabytes": 7.91,
    "node_modules_files": 1960,
    "node_modules_megabytes": 7.9
   },
   "claudeignore_sha256": null,
   "wall": 12.8,
   "context": 67877,
   "output": 642,
   "turns": 5,
   "cost": 0.118494,
   "tool_calls": [
    {
     "tool": "Bash",
     "arg": "ls -la explore_bloated_2"
    },
    {
     "tool": "Read",
     "arg": "README.md"
    },
    {
     "tool": "Read",
     "arg": "package.json"
    },
    {
     "tool": "Bash",
     "arg": "find src -type f | head -50"
    }
   ],
   "n_tool_calls": 4,
   "touched_node_modules": 0,
   "touches": [],
   "reply": "`invoice-tool` reads a CSV of billable line items and renders them into PDF invoices (via pdfkit)."
  },
  {
   "probe": "explore",
   "arm": "bloated_ignored",
   "round": 2,
   "status": "ok",
   "fixture_ok": true,
   "tree": {
    "files": 1966,
    "megabytes": 7.91,
    "node_modules_files": 1960,
    "node_modules_megabytes": 7.9
   },
   "claudeignore_sha256": "fe0828024ad385ada1a9150a4c44247694ad5dc956552bec6c02ac7d9443028c",
   "wall": 14.3,
   "context": 90919,
   "output": 842,
   "turns": 6,
   "cost": 0.1351665,
   "tool_calls": [
    {
     "tool": "Bash",
     "arg": "ls -la explore_bloated_ignored_2"
    },
    {
     "tool": "Read",
     "arg": "README.md"
    },
    {
     "tool": "Read",
     "arg": "package.json"
    },
    {
     "tool": "Bash",
     "arg": "find src -type f | head -50 && echo \"--- claudeignore ---\" && cat .claudeignore"
    },
    {
     "tool": "Bash",
     "arg": "wc -l <redacted-local-path> && head -30 index.js"
    }
   ],
   "n_tool_calls": 5,
   "touched_node_modules": 0,
   "touches": [],
   "reply": "It's `invoice-tool` \u2014 a small Node library that reads a CSV of billable line items and renders them into a PDF invoice using pdfkit (`index.js` wires `parse.js` \u2192 `render.js`)."
  },
  {
   "probe": "startup",
   "arm": "lean",
   "round": 3,
   "status": "ok",
   "fixture_ok": true,
   "tree": {
    "files": 5,
    "megabytes": 0.0,
    "node_modules_files": 0,
    "node_modules_megabytes": 0.0
   },
   "claudeignore_sha256": null,
   "wall": 4.4,
   "context": 22401,
   "output": 18,
   "turns": 1,
   "cost": 0.06772,
   "tool_calls": [],
   "n_tool_calls": 0,
   "touched_node_modules": 0,
   "touches": [],
   "reply": "READY."
  },
  {
   "probe": "startup",
   "arm": "bloated",
   "round": 3,
   "status": "ok",
   "fixture_ok": true,
   "tree": {
    "files": 1965,
    "megabytes": 7.91,
    "node_modules_files": 1960,
    "node_modules_megabytes": 7.9
   },
   "claudeignore_sha256": null,
   "wall": 3.1,
   "context": 22403,
   "output": 17,
   "turns": 1,
   "cost": 0.067735,
   "tool_calls": [],
   "n_tool_calls": 0,
   "touched_node_modules": 0,
   "touches": [],
   "reply": "READY."
  },
  {
   "probe": "startup",
   "arm": "bloated_ignored",
   "round": 3,
   "status": "ok",
   "fixture_ok": true,
   "tree": {
    "files": 1966,
    "megabytes": 7.91,
    "node_modules_files": 1960,
    "node_modules_megabytes": 7.9
   },
   "claudeignore_sha256": "fe0828024ad385ada1a9150a4c44247694ad5dc956552bec6c02ac7d9443028c",
   "wall": 3.2,
   "context": 22411,
   "output": 16,
   "turns": 1,
   "cost": 0.06781,
   "tool_calls": [],
   "n_tool_calls": 0,
   "touched_node_modules": 0,
   "touches": [],
   "reply": "READY."
  },
  {
   "probe": "explore",
   "arm": "lean",
   "round": 3,
   "status": "ok",
   "fixture_ok": true,
   "tree": {
    "files": 5,
    "megabytes": 0.0,
    "node_modules_files": 0,
    "node_modules_megabytes": 0.0
   },
   "claudeignore_sha256": null,
   "wall": 12.4,
   "context": 67787,
   "output": 684,
   "turns": 5,
   "cost": 0.1190525,
   "tool_calls": [
    {
     "tool": "Bash",
     "arg": "ls -la explore_lean_3"
    },
    {
     "tool": "Read",
     "arg": "README.md"
    },
    {
     "tool": "Read",
     "arg": "package.json"
    },
    {
     "tool": "Bash",
     "arg": "find src -type f | head -50"
    }
   ],
   "n_tool_calls": 4,
   "touched_node_modules": 0,
   "touches": [],
   "reply": "**invoice-tool** reads a CSV of billable lines and renders them into PDF invoices (via `pdfkit`), with `parse.js` handling CSV parsing, `render.js` the PDF output, and `index.js` tying them together."
  },
  {
   "probe": "explore",
   "arm": "bloated",
   "round": 3,
   "status": "ok",
   "fixture_ok": true,
   "tree": {
    "files": 1965,
    "megabytes": 7.91,
    "node_modules_files": 1960,
    "node_modules_megabytes": 7.9
   },
   "claudeignore_sha256": null,
   "wall": 11.4,
   "context": 67877,
   "output": 664,
   "turns": 5,
   "cost": 0.11904400000000001,
   "tool_calls": [
    {
     "tool": "Bash",
     "arg": "ls -la explore_bloated_3"
    },
    {
     "tool": "Read",
     "arg": "README.md"
    },
    {
     "tool": "Read",
     "arg": "package.json"
    },
    {
     "tool": "Bash",
     "arg": "find src -type f | head -50"
    }
   ],
   "n_tool_calls": 4,
   "touched_node_modules": 0,
   "touches": [],
   "reply": "It reads a CSV of billable line items and renders them into PDF invoices (via pdfkit) \u2014 `parse.js` handles the CSV, `render.js` the PDF output."
  },
  {
   "probe": "explore",
   "arm": "bloated_ignored",
   "round": 3,
   "status": "ok",
   "fixture_ok": true,
   "tree": {
    "files": 1966,
    "megabytes": 7.91,
    "node_modules_files": 1960,
    "node_modules_megabytes": 7.9
   },
   "claudeignore_sha256": "fe0828024ad385ada1a9150a4c44247694ad5dc956552bec6c02ac7d9443028c",
   "wall": 24.3,
   "context": 114806,
   "output": 1297,
   "turns": 9,
   "cost": 0.1655165,
   "tool_calls": [
    {
     "tool": "Bash",
     "arg": "ls -la explore_bloated_ignored_3"
    },
    {
     "tool": "Read",
     "arg": "README.md"
    },
    {
     "tool": "Read",
     "arg": "package.json"
    },
    {
     "tool": "Read",
     "arg": ".claudeignore"
    },
    {
     "tool": "Bash",
     "arg": "find src -type f | head -50 && echo \"---\" && wc -l <redacted-local-path> null"
    },
    {
     "tool": "Read",
     "arg": "index.js"
    },
    {
     "tool": "Read",
     "arg": "parse.js"
    },
    {
     "tool": "Read",
     "arg": "render.js"
    }
   ],
   "n_tool_calls": 8,
   "touched_node_modules": 0,
   "touches": [],
   "reply": "It's a small Node.js tool (`invoice-tool`) that parses a CSV of billable lines (description, quantity, unit price) and generates PDF invoices from them \u2014 though the current `render.js` is a stub that only computes totals rather than actually writing a PDF via its `pdfkit` dependency."
  }
 ],
 "canary_runs": [
  {
   "round": 0,
   "mode": "none",
   "canary_on_disk": true,
   "settings_written": false,
   "claudeignore_written": false,
   "canary_leaked": true,
   "reply": "CANARY-7731"
  },
  {
   "round": 0,
   "mode": "claudeignore",
   "canary_on_disk": true,
   "settings_written": false,
   "claudeignore_written": true,
   "canary_leaked": true,
   "reply": "CANARY-7731"
  },
  {
   "round": 0,
   "mode": "deny",
   "canary_on_disk": true,
   "settings_written": true,
   "claudeignore_written": false,
   "canary_leaked": false,
   "reply": "I can't read it \u2014 that path is blocked by your permission settings (`node_modules` is denied), so the read failed before any content was returned.\n\nIf you want the contents, you'd need to allow that directory in your permissions (e.g. via `permissions` or the `update-config` skill), or copy t"
  },
  {
   "round": 1,
   "mode": "none",
   "canary_on_disk": true,
   "settings_written": false,
   "claudeignore_written": false,
   "canary_leaked": true,
   "reply": "CANARY-7731"
  },
  {
   "round": 1,
   "mode": "claudeignore",
   "canary_on_disk": true,
   "settings_written": false,
   "claudeignore_written": true,
   "canary_leaked": true,
   "reply": "CANARY-7731"
  },
  {
   "round": 1,
   "mode": "deny",
   "canary_on_disk": true,
   "settings_written": true,
   "claudeignore_written": false,
   "canary_leaked": false,
   "reply": "I can't read that file \u2014 it's in a directory blocked by your permission settings (`node_modules` appears to be on the deny list).\n\nIf you want me to read it, you'd need to allow that path in your permissions (e.g. via `permissions` or the `update-config` skill)."
  },
  {
   "round": 2,
   "mode": "none",
   "canary_on_disk": true,
   "settings_written": false,
   "claudeignore_written": false,
   "canary_leaked": true,
   "reply": "CANARY-7731"
  },
  {
   "round": 2,
   "mode": "claudeignore",
   "canary_on_disk": true,
   "settings_written": false,
   "claudeignore_written": true,
   "canary_leaked": true,
   "reply": "CANARY-7731"
  },
  {
   "round": 2,
   "mode": "deny",
   "canary_on_disk": true,
   "settings_written": true,
   "claudeignore_written": false,
   "canary_leaked": false,
   "reply": "I can't read that file \u2014 it's in a directory blocked by your permission settings (`node_modules` is denied), so the read was refused before it happened.\n\nIf you want me to access it, you'd need to allow that path in your permission settings (`permissions`), or copy the file outside the denied"
  }
 ]
}