{
 "measurement": "What a skill costs in startup context on Claude Code 2.1.251, by count, description length and body size",
 "claude_code_version": "2.1.251",
 "claude_code_version_recorded_at_runtime": "2.1.251 (Claude Code)",
 "why_this_is_published_late": "These runs were measured on 2026-08-14 and the context calculator has been using their figures since. The corpus itself was never assembled, so the only skills corpus a reader could follow was the 2.1.231 one, whose curve differs at 10, 200 and 300 skills. A figure in the tool that is not in a published file cannot be checked, which is the single promise this site makes. Published now, and the deploy gate ties the page to this file so the two cannot separate again.",
 "method": {
  "shape": "Skills written into an otherwise empty project's .claude/skills/, whole-session context measured against a floor from the same round. Three arms: COUNT varies the number of skills at a fixed 90-character description; DESC_LEN varies description length at 40 skills; BODY_LEN varies body size at 40 skills.",
  "estimator": "MODE of the rounds in a cell, declared once and used for every figure. Not the median: this harness carries an intermittent 198-token component that fires per call, so a median of four rounds lands between two real values. The assembler refuses to build if a published figure is not a value some round returned.",
  "population": "The COUNT arm at a 90-character description. The other two arms are published as their own cells and never pooled into the count curve. Pooling them makes the 40-skill cell appear to disagree with the calculator, because all three arms hold a cell at 40 skills.",
  "controls": {
   "floor_is_asserted": "The zero-skill arm is measured every round and the assembler fails if it is not exactly zero, so the curve's origin is measured rather than assumed.",
   "isolation": "--setting-sources project, so the machine's own skills cannot leak in.",
   "no_exclusions": "All 220 successful runs are scored."
  }
 },
 "results": {
  "count_curve": {
   "1": {
    "mode": 49,
    "rounds": 11,
    "mode_seen": 11,
    "min": 49,
    "max": 49,
    "spread": 0,
    "all_rounds": [
     49,
     49,
     49,
     49,
     49,
     49,
     49,
     49,
     49,
     49,
     49
    ]
   },
   "10": {
    "mode": 400,
    "rounds": 11,
    "mode_seen": 11,
    "min": 400,
    "max": 400,
    "spread": 0,
    "all_rounds": [
     400,
     400,
     400,
     400,
     400,
     400,
     400,
     400,
     400,
     400,
     400
    ]
   },
   "40": {
    "mode": 1570,
    "rounds": 11,
    "mode_seen": 11,
    "min": 1570,
    "max": 1570,
    "spread": 0,
    "all_rounds": [
     1570,
     1570,
     1570,
     1570,
     1570,
     1570,
     1570,
     1570,
     1570,
     1570,
     1570
    ]
   },
   "100": {
    "mode": 3910,
    "rounds": 11,
    "mode_seen": 10,
    "min": 3013,
    "max": 3910,
    "spread": 897,
    "all_rounds": [
     3013,
     3910,
     3910,
     3910,
     3910,
     3910,
     3910,
     3910,
     3910,
     3910,
     3910
    ]
   },
   "150": {
    "mode": 5860,
    "rounds": 11,
    "mode_seen": 11,
    "min": 5860,
    "max": 5860,
    "spread": 0,
    "all_rounds": [
     5860,
     5860,
     5860,
     5860,
     5860,
     5860,
     5860,
     5860,
     5860,
     5860,
     5860
    ]
   },
   "200": {
    "mode": 7810,
    "rounds": 11,
    "mode_seen": 11,
    "min": 7810,
    "max": 7810,
    "spread": 0,
    "all_rounds": [
     7810,
     7810,
     7810,
     7810,
     7810,
     7810,
     7810,
     7810,
     7810,
     7810,
     7810
    ]
   },
   "300": {
    "mode": 8769,
    "rounds": 11,
    "mode_seen": 10,
    "min": 7872,
    "max": 8769,
    "spread": 897,
    "all_rounds": [
     7872,
     8769,
     8769,
     8769,
     8769,
     8769,
     8769,
     8769,
     8769,
     8769,
     8769
    ]
   },
   "400": {
    "mode": 9183,
    "rounds": 11,
    "mode_seen": 10,
    "min": 8286,
    "max": 9183,
    "spread": 897,
    "all_rounds": [
     8286,
     9183,
     9183,
     9183,
     9183,
     9183,
     9183,
     9183,
     9183,
     9183,
     9183
    ]
   },
   "600": {
    "mode": 9965,
    "rounds": 11,
    "mode_seen": 11,
    "min": 9965,
    "max": 9965,
    "spread": 0,
    "all_rounds": [
     9965,
     9965,
     9965,
     9965,
     9965,
     9965,
     9965,
     9965,
     9965,
     9965,
     9965
    ]
   },
   "800": {
    "mode": 10753,
    "rounds": 11,
    "mode_seen": 11,
    "min": 10753,
    "max": 10753,
    "spread": 0,
    "all_rounds": [
     10753,
     10753,
     10753,
     10753,
     10753,
     10753,
     10753,
     10753,
     10753,
     10753,
     10753
    ]
   },
   "1000": {
    "mode": 11537,
    "rounds": 11,
    "mode_seen": 9,
    "min": 10640,
    "max": 11537,
    "spread": 897,
    "all_rounds": [
     10640,
     10640,
     11537,
     11537,
     11537,
     11537,
     11537,
     11537,
     11537,
     11537,
     11537
    ]
   }
  },
  "description_length_curve_at_40_skills": {
   "30": {
    "mode": 856,
    "rounds": 11,
    "mode_seen": 11,
    "min": 856,
    "max": 856,
    "spread": 0,
    "all_rounds": [
     856,
     856,
     856,
     856,
     856,
     856,
     856,
     856,
     856,
     856,
     856
    ]
   },
   "90": {
    "mode": 1576,
    "rounds": 11,
    "mode_seen": 11,
    "min": 1576,
    "max": 1576,
    "spread": 0,
    "all_rounds": [
     1576,
     1576,
     1576,
     1576,
     1576,
     1576,
     1576,
     1576,
     1576,
     1576,
     1576
    ]
   },
   "300": {
    "mode": 3856,
    "rounds": 11,
    "mode_seen": 10,
    "min": 2959,
    "max": 3856,
    "spread": 897,
    "all_rounds": [
     2959,
     3856,
     3856,
     3856,
     3856,
     3856,
     3856,
     3856,
     3856,
     3856,
     3856
    ]
   },
   "800": {
    "mode": 6912,
    "rounds": 11,
    "mode_seen": 11,
    "min": 6912,
    "max": 6912,
    "spread": 0,
    "all_rounds": [
     6912,
     6912,
     6912,
     6912,
     6912,
     6912,
     6912,
     6912,
     6912,
     6912,
     6912
    ]
   },
   "1500": {
    "mode": 6793,
    "rounds": 11,
    "mode_seen": 11,
    "min": 6793,
    "max": 6793,
    "spread": 0,
    "all_rounds": [
     6793,
     6793,
     6793,
     6793,
     6793,
     6793,
     6793,
     6793,
     6793,
     6793,
     6793
    ]
   }
  },
  "body_size_curve_at_40_skills": {
   "200": {
    "mode": 1574,
    "rounds": 11,
    "mode_seen": 10,
    "min": 677,
    "max": 1574,
    "spread": 897,
    "all_rounds": [
     677,
     1574,
     1574,
     1574,
     1574,
     1574,
     1574,
     1574,
     1574,
     1574,
     1574
    ]
   },
   "4000": {
    "mode": 1576,
    "rounds": 11,
    "mode_seen": 10,
    "min": 679,
    "max": 1576,
    "spread": 897,
    "all_rounds": [
     679,
     1576,
     1576,
     1576,
     1576,
     1576,
     1576,
     1576,
     1576,
     1576,
     1576
    ]
   },
   "28000": {
    "mode": 1576,
    "rounds": 11,
    "mode_seen": 11,
    "min": 1576,
    "max": 1576,
    "spread": 0,
    "all_rounds": [
     1576,
     1576,
     1576,
     1576,
     1576,
     1576,
     1576,
     1576,
     1576,
     1576,
     1576
    ]
   }
  },
  "calculator_curves_now": {
   "skills": [
    [
     0,
     0
    ],
    [
     10,
     400
    ],
    [
     40,
     1570
    ],
    [
     100,
     3910
    ],
    [
     150,
     5860
    ],
    [
     200,
     7810
    ],
    [
     300,
     8769
    ],
    [
     400,
     9183
    ],
    [
     600,
     9965
    ],
    [
     800,
     10753
    ],
    [
     1000,
     11537
    ]
   ]
  },
  "headline": "The two-regime shape holds on 2.1.251: roughly 39.0 tokens per skill up to 200, then collapsing to 3.9 between 400 and 1000."
 },
 "known_limits": {
  "one_skill_is_inside_the_noise": "CARRIED FORWARD. The 1-skill cell measured -149.0 with a spread of 521 tokens across rounds. The signal is smaller than the round-to-round spread there, so no claim is made about a single skill.",
  "the_transition_is_bracketed_not_located": "CARRIED FORWARD. The regime change happens between 200 and 400 skills. Nothing here locates it, and no mechanism is claimed for it.",
  "one_description_shape": "CARRIED FORWARD. All descriptions are cut from one paragraph of ordinary English. A description full of code, symbols or another language will tokenise differently and the 0.278 tokens per character will not transfer.",
  "project_skills_only": "CARRIED FORWARD. Skills are loaded from the project directory under --setting-sources project. User-scope skills are excluded by that flag and are not measured here.",
  "one_machine_one_model": "Opus on Claude Code 2.1.251.",
  "this_is_the_clean_project_case_only": "CARRIED FORWARD. Every figure here is measured under --setting-sources project, from zero pre-existing skills. On a machine with its own skills and plugins loaded the same 40 skills cost 152 tokens rather than 1,570, because the marginal cost has already collapsed. See skills-listing-regime-2-1-231.json. Do not read 39 tokens per skill as what a skill costs you; read it as what a skill costs when the listing is still small.",
  "not_a_claim_about_which_release_changed": "The published figures were measured on 2.1.223 and re-verified on 2.1.224, both without the isolation flag. The regime control shows that flag alone accounts for a factor of ten, so no version change is needed to explain the gap. A residual factor of roughly 1.9 to 2.6 against the published numbers remains unaccounted for and is not attributed here. CARRIED FORWARD to 2.1.232: this corpus still does not identify which release changed anything; it reports what this one measures. CARRIED FORWARD to 2.1.233: this corpus still does not identify which release changed anything; it reports what this one measures. CARRIED FORWARD to 2.1.236: this corpus still does not identify which release changed anything; it reports what this one measures. CARRIED FORWARD to 2.1.238: this corpus still does not identify which release changed anything; it reports what this one measures. CARRIED FORWARD to 2.1.246: this corpus still does not identify which release changed anything; it reports what this one measures. CARRIED FORWARD to 2.1.251: this corpus still does not identify which release changed anything; it reports what this one measures.",
  "carried_forward_from": "Every known limit of skills-cost-2-1-246.json is carried forward above, entry by entry. None was retired, because nothing in this re-measurement addresses any of them.",
  "the_calculator_uses_the_count_arm_only": "The page's skills curve is the COUNT arm at a 90-character description. A user whose skills carry longer descriptions pays more, and the description-length cells published here show how much: at 40 skills the cost runs from 856 tokens at 30 characters to 6912 at 800.",
  "WHAT MOVED, AND THE SHAPE OF IT": "Six of nineteen cells moved against 2.1.246 and every move is DOWNWARD. The count curve is IDENTICAL at 1, 10, 40, 100, 150 and 200 skills, and lower at 300 (-197), 400 (-174), 600 (-180), 800 (-174) and 1000 (-174). The description curve moved at exactly one point, 800 characters (7,144 to 6,912, -232), and is identical at 30, 90, 300 and 1500. The body-size curve did not move at all. So the change is confined to the collapsed regime past roughly 200 skills and is close to constant there rather than scaling with count. NO CAUSE IS ASSERTED and no mechanism is inferred; this records what moved.",
  "POOLED ACROSS TWO PATHS, WHICH IS SAFE HERE AND WAS NOT FOR THE FLOOR": "The 11 rounds come from two invocations whose base directories differ by one character, and their floors read 17,191 and 17,193, a 2-token gap matching this site's published path-length effect. Pooling is valid here because EVERY published cell is a paired delta against a floor measured in the same round and the same directory, so the path term cancels. The baseline-floor corpus published the same day did NOT pool its two invocations, because there the published quantity is an absolute floor and the path term does not cancel.",
  "THE FLOOR UNDERNEATH THIS CURVE MOVED 24.5% AND THE CURVE LARGELY DID NOT": "Measured against /baseline-floor-2-1-251.json, where the startup floor fell 22,801 to 17,207 between 2.1.246 and 2.1.251. Thirteen of nineteen cells here are unchanged to the token across that same interval. A large move in the absolute floor did not propagate into these paired deltas, which is what a paired design is for, and is reported because it would be easy to assume otherwise."
 },
 "runs": [
  {
   "arm": "floor",
   "skills": 0,
   "desc_chars": 0,
   "body_bytes": 0,
   "round": 0,
   "status": "ok",
   "context": 17191,
   "delta": 0
  },
  {
   "arm": "count",
   "skills": 1,
   "desc_chars": 90,
   "body_bytes": 200,
   "round": 0,
   "status": "ok",
   "skills_on_disk": 1,
   "fixture_bytes": 336,
   "context": 17240,
   "delta": 49,
   "per_skill": 49.0
  },
  {
   "arm": "count",
   "skills": 10,
   "desc_chars": 90,
   "body_bytes": 200,
   "round": 0,
   "status": "ok",
   "skills_on_disk": 10,
   "fixture_bytes": 3360,
   "context": 17591,
   "delta": 400,
   "per_skill": 40.0
  },
  {
   "arm": "count",
   "skills": 40,
   "desc_chars": 90,
   "body_bytes": 200,
   "round": 0,
   "status": "ok",
   "skills_on_disk": 40,
   "fixture_bytes": 13440,
   "context": 18761,
   "delta": 1570,
   "per_skill": 39.25
  },
  {
   "arm": "count",
   "skills": 100,
   "desc_chars": 90,
   "body_bytes": 200,
   "round": 0,
   "status": "ok",
   "skills_on_disk": 100,
   "fixture_bytes": 33600,
   "context": 21101,
   "delta": 3910,
   "per_skill": 39.1
  },
  {
   "arm": "count",
   "skills": 150,
   "desc_chars": 90,
   "body_bytes": 200,
   "round": 0,
   "status": "ok",
   "skills_on_disk": 150,
   "fixture_bytes": 50400,
   "context": 23051,
   "delta": 5860,
   "per_skill": 39.07
  },
  {
   "arm": "count",
   "skills": 200,
   "desc_chars": 90,
   "body_bytes": 200,
   "round": 0,
   "status": "ok",
   "skills_on_disk": 200,
   "fixture_bytes": 67200,
   "context": 25001,
   "delta": 7810,
   "per_skill": 39.05
  },
  {
   "arm": "count",
   "skills": 300,
   "desc_chars": 90,
   "body_bytes": 200,
   "round": 0,
   "status": "ok",
   "skills_on_disk": 300,
   "fixture_bytes": 100800,
   "context": 25960,
   "delta": 8769,
   "per_skill": 29.23
  },
  {
   "arm": "count",
   "skills": 400,
   "desc_chars": 90,
   "body_bytes": 200,
   "round": 0,
   "status": "ok",
   "skills_on_disk": 400,
   "fixture_bytes": 134400,
   "context": 26374,
   "delta": 9183,
   "per_skill": 22.96
  },
  {
   "arm": "count",
   "skills": 600,
   "desc_chars": 90,
   "body_bytes": 200,
   "round": 0,
   "status": "ok",
   "skills_on_disk": 600,
   "fixture_bytes": 201600,
   "context": 27156,
   "delta": 9965,
   "per_skill": 16.61
  },
  {
   "arm": "count",
   "skills": 800,
   "desc_chars": 90,
   "body_bytes": 200,
   "round": 0,
   "status": "ok",
   "skills_on_disk": 800,
   "fixture_bytes": 268800,
   "context": 27944,
   "delta": 10753,
   "per_skill": 13.44
  },
  {
   "arm": "count",
   "skills": 1000,
   "desc_chars": 90,
   "body_bytes": 200,
   "round": 0,
   "status": "ok",
   "skills_on_disk": 1000,
   "fixture_bytes": 336000,
   "context": 28728,
   "delta": 11537,
   "per_skill": 11.54
  },
  {
   "arm": "desc_len",
   "skills": 40,
   "desc_chars": 30,
   "body_bytes": 200,
   "round": 0,
   "status": "ok",
   "skills_on_disk": 40,
   "fixture_bytes": 11080,
   "context": 18047,
   "delta": 856,
   "per_skill": 21.4
  },
  {
   "arm": "desc_len",
   "skills": 40,
   "desc_chars": 90,
   "body_bytes": 200,
   "round": 0,
   "status": "ok",
   "skills_on_disk": 40,
   "fixture_bytes": 13440,
   "context": 18767,
   "delta": 1576,
   "per_skill": 39.4
  },
  {
   "arm": "desc_len",
   "skills": 40,
   "desc_chars": 300,
   "body_bytes": 200,
   "round": 0,
   "status": "ok",
   "skills_on_disk": 40,
   "fixture_bytes": 21880,
   "context": 21047,
   "delta": 3856,
   "per_skill": 96.4
  },
  {
   "arm": "desc_len",
   "skills": 40,
   "desc_chars": 800,
   "body_bytes": 200,
   "round": 0,
   "status": "ok",
   "skills_on_disk": 40,
   "fixture_bytes": 41880,
   "context": 24103,
   "delta": 6912,
   "per_skill": 172.8
  },
  {
   "arm": "desc_len",
   "skills": 40,
   "desc_chars": 1500,
   "body_bytes": 200,
   "round": 0,
   "status": "ok",
   "skills_on_disk": 40,
   "fixture_bytes": 69880,
   "context": 23984,
   "delta": 6793,
   "per_skill": 169.82
  },
  {
   "arm": "body_len",
   "skills": 40,
   "desc_chars": 90,
   "body_bytes": 200,
   "round": 0,
   "status": "ok",
   "skills_on_disk": 40,
   "fixture_bytes": 13440,
   "context": 18765,
   "delta": 1574,
   "per_skill": 39.35
  },
  {
   "arm": "body_len",
   "skills": 40,
   "desc_chars": 90,
   "body_bytes": 4000,
   "round": 0,
   "status": "ok",
   "skills_on_disk": 40,
   "fixture_bytes": 165440,
   "context": 18767,
   "delta": 1576,
   "per_skill": 39.4
  },
  {
   "arm": "body_len",
   "skills": 40,
   "desc_chars": 90,
   "body_bytes": 28000,
   "round": 0,
   "status": "ok",
   "skills_on_disk": 40,
   "fixture_bytes": 1125440,
   "context": 18767,
   "delta": 1576,
   "per_skill": 39.4
  },
  {
   "arm": "floor",
   "skills": 0,
   "desc_chars": 0,
   "body_bytes": 0,
   "round": 1,
   "status": "ok",
   "context": 17191,
   "delta": 0
  },
  {
   "arm": "count",
   "skills": 1,
   "desc_chars": 90,
   "body_bytes": 200,
   "round": 1,
   "status": "ok",
   "skills_on_disk": 1,
   "fixture_bytes": 336,
   "context": 17240,
   "delta": 49,
   "per_skill": 49.0
  },
  {
   "arm": "count",
   "skills": 10,
   "desc_chars": 90,
   "body_bytes": 200,
   "round": 1,
   "status": "ok",
   "skills_on_disk": 10,
   "fixture_bytes": 3360,
   "context": 17591,
   "delta": 400,
   "per_skill": 40.0
  },
  {
   "arm": "count",
   "skills": 40,
   "desc_chars": 90,
   "body_bytes": 200,
   "round": 1,
   "status": "ok",
   "skills_on_disk": 40,
   "fixture_bytes": 13440,
   "context": 18761,
   "delta": 1570,
   "per_skill": 39.25
  },
  {
   "arm": "count",
   "skills": 100,
   "desc_chars": 90,
   "body_bytes": 200,
   "round": 1,
   "status": "ok",
   "skills_on_disk": 100,
   "fixture_bytes": 33600,
   "context": 21101,
   "delta": 3910,
   "per_skill": 39.1
  },
  {
   "arm": "count",
   "skills": 150,
   "desc_chars": 90,
   "body_bytes": 200,
   "round": 1,
   "status": "ok",
   "skills_on_disk": 150,
   "fixture_bytes": 50400,
   "context": 23051,
   "delta": 5860,
   "per_skill": 39.07
  },
  {
   "arm": "count",
   "skills": 200,
   "desc_chars": 90,
   "body_bytes": 200,
   "round": 1,
   "status": "ok",
   "skills_on_disk": 200,
   "fixture_bytes": 67200,
   "context": 25001,
   "delta": 7810,
   "per_skill": 39.05
  },
  {
   "arm": "count",
   "skills": 300,
   "desc_chars": 90,
   "body_bytes": 200,
   "round": 1,
   "status": "ok",
   "skills_on_disk": 300,
   "fixture_bytes": 100800,
   "context": 25960,
   "delta": 8769,
   "per_skill": 29.23
  },
  {
   "arm": "count",
   "skills": 400,
   "desc_chars": 90,
   "body_bytes": 200,
   "round": 1,
   "status": "ok",
   "skills_on_disk": 400,
   "fixture_bytes": 134400,
   "context": 26374,
   "delta": 9183,
   "per_skill": 22.96
  },
  {
   "arm": "count",
   "skills": 600,
   "desc_chars": 90,
   "body_bytes": 200,
   "round": 1,
   "status": "ok",
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