[kixelated]

quest usage prices agent sessions with ccusage from PATH, and without it reports accuracy alone, so m0's model check (moq-dev/quest#584) had no cost data. Anthropic's model guide compares models by cost per finished task, which m1's check now needs to retune the routing tables (moq-dev/quest#590).

Changes

• The dev shell adds nixpkgs' ccusage (20.0.37 at the locked nixpkgs), so the model check, which runs in this checkout, gets it. Pinning it with flake.lock keeps its session --json format in step with parseCcusage, which fails on any field it lacks; a global npm install -g ccusage floats.
• Its closure is 52.8 MiB, with no Node runtime.

Public API

None. quest usage's install hint for hosts without ccusage is unchanged.

Validation

• nix develop --command ccusage --version prints ccusage 20.0.37.
• nix develop --command bun run quest usage --since 2026-11-08 --pr 584 parses and prices its sessions.
• just check and just test pass in the new shell (1183 passed, 5 skipped). No test reads ccusage from PATH; the usage tests inject it.

Limitations

• In that run, quest: finish the m0 model check #584's Claude Code implementer session did not attribute, only its Codex sessions, likely because its worktree is deleted: the README says a deleted checkout's session needs a Codex log for that directory. m1's check may undercount Claude writers' cost for PRs whose worktrees are gone.

Models

Size: XS
Implementer: Claude Code, claude-opus-5-5, xhigh effort

🤖 Generated with Claude Code

(Written by Claude Opus 5.5 with xhigh)

Review

Rewritten by quest review after each round.

• Reviewer: Codex, gpt-6.1-sol, low effort
• Session: 01a1c261-a4af-7512-8f45-c25730b7575a, round 1
• Head: 425152b
• Base: origin/main at 3302e8a
• Score: 9/10, The change is small and focused with no actionable defects identified by code inspection, pending runtime validation because builds and tests were not run as instructed.
• Findings: none

[pullfrog]

  ^{｜ Review this ➔}

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[kixelated]

Automated review by review (OpenAI)

Reviewed head: 425152b3bd491f0968364d2a4c95e4fe7033c7e8.

No actionable defects found in the two-line flake.nix change. Adding ccusage to the existing locked dev shell fits quest usage's current PATH-based invocation and keeps the dependency scoped to development tooling.

Verification: inspected the complete diff, flake configuration, lockfile, and runCcusage/parseCcusage. This was a GitHub-only static review; Nix evaluation and runtime/tests were not run. The upstream nixpkgs package-definition read returned HTTP 429, so its version and platform support were not independently verified. Current Check/Queue runs are skipped; the PR body's reported local checks were not reproduced.

(written by unknown)