speckit-companion: Command for Claude Code

.claude/commands/bench-capture.md

bench-capture is a command for Claude Code from alfredoperez/speckit-companion. It costs 15 tokens per session (866 once invoked), scanned A, original, MIT.

A benchmark capture command that evaluates two sandboxed implementations of the same feature and records the results. It checks the build, acceptance behavior, regressions, conventions, and code quality, then updates the report.

In plain words
What is it for?
Use it after a benchmark to score readability, conventions, scope, tests, and behavior, save the evaluation history, and regenerate the report.
Why use it?
It turns a manual comparison into a repeatable record and clears the folders for the next run. Independent reviewers help assess the code and compare the two solutions.

Command for Claude Code

Written for Claude Code: allowed-tools in frontmatter. Also seen: mentions CLAUDE.md; names the AskUserQuestion tool.

This is alfredoperez/speckit-companion's own configuration. It tells Claude Code how to work on speckit-companion itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything speckit-companion configures →

Needs its repository: it reads a path above its own folder, which exists only inside the repository. The line is Bash(node ../speckit-bench/run-all.mjs:*), Bash(git -C:*), Agent, Workflow, AskUserQuestion.

Reuse

Borrowing it

Nothing to install: this file belongs to alfredoperez/speckit-companion. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/alfredoperez/speckit-companion/main/.claude/commands/bench-capture.md
Clone the repo
git clone --depth 1 https://github.com/alfredoperez/speckit-companion

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for bench-capture

README.md
[![agentmods](https://agentmods.dev/badge/commands/alfredoperez/speckit-companion/bench-capture/github.svg)](https://agentmods.dev/commands/alfredoperez/speckit-companion/bench-capture)
Your own site
<a href="https://agentmods.dev/commands/alfredoperez/speckit-companion/bench-capture"><img src="https://agentmods.dev/badge/commands/alfredoperez/speckit-companion/bench-capture/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for bench-capture

Your own site · 80×15
<a href="https://agentmods.dev/commands/alfredoperez/speckit-companion/bench-capture"><img src="https://agentmods.dev/badge/commands/alfredoperez/speckit-companion/bench-capture.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 15 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 866 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00015 $0.00866
Opus 5 $0.00008 $0.00433
Sonnet 5 $0.00003 $0.00173
Haiku 4.5 $0.00002 $0.00087

Measured 4d ago against content hash 2b4b23c7d876, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

bench-capture scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 4d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.claude/commands/bench-capture.md · 57 lines

How it starts

The opening of the file, as written. The whole thing — 57 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Your task

After a size has been run through its three cells, capture the evals, append to history, regenerate the report, and reset the cells for the next round.

1. Resolve the size

From $ARGUMENTSeasy | medium | hard | oversized. If missing, ask with AskUserQuestion.

2. Read the cell mapping

node ../speckit-bench/run-all.mjs --dry-run

It prints which letter carries which arm, plus the spec-kit, extension and Companion versions this round was measured with. You need the mapping to attribute the reviews; the judges below must not be told which arm they are looking at.

3. Independent rubric judges (before measuring — they read the diff)

Spawn one judge agent per cell (a parallel() Workflow of 3). Each judge — which did NOT write the code — does exactly:

  • Read the diff: git -C ~/dev/projects/conduit-<size>-<letter> diff bench-baseline.
  • Read the requirements at ../speckit-bench/prompts/conduit/<size>.md and the conventions in the cell's CLAUDE.md.
  • Score 1–5: readability, conventions, scope. Judge the layering rules the app actually documents; do not penalize a rule the size had no occasion to exercise.
  • Write quality = {readability, conventions, scope, justification} into ../speckit-bench/runs-meta/conduit-<size>-<letter>.json (MERGE — keep runId/size/mode).

Give each judge the letter only. A judge told it is looking at "the Companion arm" is no longer independent.

4. Comparative reviewer (one agent, cross-solution)

The per-cell judges score each solution in isolation, and tests cannot fully pin correctness. Spawn one reviewer that sees all three at once. Run it before step 5 — measuring resets the cells and erases the diffs. It does exactly:

  • Read all three diffs (git -C ~/dev/projects/conduit-<size>-<letter> diff bench-baseline), labeled A, B and C.
  • Read the requirements and the conventions.
  • Produce a comparative review:
    • Ranking best to worst, one line each.
    • Head-to-head differences — structure, layering, naming, edge cases, test coverage.
    • Suspected bugs the deterministic harness cannot catch, per solution (or "none found").
    • One-line verdict per solution.
  • Write it to ../speckit-bench/reviews/<size>.md — committed there, accumulating: read the existing file first, then prepend a ## <YYYY-MM-DD> — <size> section so prior runs are preserved.

Read the full file on GitHub · 57 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 4d ago Changed · +3 lines · -20 tokens per session 2b4b23c7d876
  2. 12d ago First seen · 54 lines · 35 tokens per session scan A 8724908ce39b

Subscribe to this mod's changes

bench-capture is a command published in the GitHub repository alfredoperez/speckit-companion (90 stars, last pushed today), licensed MIT. It adds 15 tokens to every session and 866 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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