lib/context-bill.ts, ported from the v2 fork and STRIPPED to the tiers
this repo's skills can exercise: ALWAYS-ON (per-skill frontmatter bytes
with dead-key and foreign-host-file flags), EAGER (SKILL.md + any
forced 'for every invocation' references), on-disk totals, --diff,
--budget, and --exact with the calibration table. The fork's
CONDITIONAL/TRANSITIVE/LAZY/FAST-PATH parsers understand only its
dispatcher layout and were dropped; the tier fields stay in the report
shape (empty/zero/null) so re-adding a parser is additive.
TOKEN_DIVISORS and their provenance docblock kept; --help notes
recalibration via --exact's calibration block.
Three upstream fixes over the fork:
(a) findSkillDirs treats the walk ROOT as a container — the repo root's
router SKILL.md is billed AND its children are walked (the fork
short-circuited and billed one skill); walkMd skips node_modules
and dot-directories.
(b) installed-tree layout: subdirs that are their own repo checkout
(a gstack/ clone inside ~/.claude/skills, detected by .git) are
skipped, and directory symlinks (connect-chrome) are followed with
a container-recursion cycle guard.
(c) ROUTER_KEYS widened to the upstream frontmatter contract {name,
description, version, allowed-tools, triggers, preamble-tier}.
--exact writes an egress receipt (sink context-bill-exact, host
api.anthropic.com) BEFORE any count_tokens POST; if the receipt cannot
be written the run degrades to the offline estimate with a warning —
nothing is sent unrecorded. bin/gstack-context-bill is the bun shim.
Tests: fixture-tree ledgers, the three fixes, --diff/--budget exit
codes, --exact with injected fetch (envelope subtraction, receipt
ordering, fail-open degradation), CLI smoke test, and ground truth
against THIS repo via test/helpers/skill-census.ts.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
(cherry picked from commit 675c19876b87ec927b555f5f64c7f93130b3de90)
Garry Tan