pr-cost: annotate GitHub PRs with session AI cost - #31
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Create a stdlib-only pr-cost skill that emits a typed payload, records local ledger entries, and only posts GitHub PR comments when live writes are explicitly enabled.
Thin harness wrappers call the shared collector after gh pr create. Codex is an opt-in gh wrapper because it has no native PR hook.
Prove Cursor, Claude, and Codex wrappers write a ledger on gh pr create without invoking GitHub while live writes stay off.
Paste the Claude handover into a fresh session to comment Claude cost on an open PR. Codex token_count JSONL can be read the same way.
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AI cost payload for the session that created this PR: {
"confidence": "estimated",
"generated_at": "2026-08-20T20:17:07+00:00",
"harness": "codex",
"model": "gpt-5.6-sol",
"notes": "Dogfood live annotate --harness codex. Tokens from the latest local Codex JSONL token_count (session 01a0207b, cwd was a ui worktree, not this repo). USD estimated at gpt-5.6-sol catalog rates $5/$30 per MTok without a cache discount. This PR was opened from Cursor via the ideogram-fredtran fork.",
"pr_url": "https://github.com/cheshirecode/dotfiles/pull/31",
"schema_version": "pr-cost/v1",
"session_id": "01a0207b-1898-7240-bc55-9968ab569b57",
"tokens_in": 924232,
"tokens_out": 5942,
"usd": 4.7994,
"window_end": "2026-08-20T18:44:52.141Z",
"window_start": "2026-08-20T18:42:13.335Z"
} |
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Summary
ghwrapper (not on PATH by default). Comments stay off unlessPR_COST_HOOK_LIVE=1.skills/pr-cost/handovers/claude-comment-pr-cost.md) so a fresh Claude session can comment its own cost on this PR.Test plan
python3 -m unittest discover -s skills/pr-cost/tests -q(7 tests)skills/pr-cost/handovers/claude-comment-pr-cost.mdinto Claude Code and confirm a second comment for Claude cost.