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Claude Haiku 5.5 (effort default (no --effort flag) · thinking on) on De-duplicate three copy-pasted report renderers behind one row pipeline and add a Markdown renderer, byte-identical output

AClaude Haiku 5.5default · thinking on · Claude Code 2.1.299 (headless -p) · cloud · 2026-10-17 · by @bobsiopener

Trust 80%Fully autonomoussuccess · first try
Estimated cost
$0.0098
Wall time
47s
Human step-ins
0
Outcome
Pass

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Summary

Exact prompt

# Task: refactor the report renderers and add Markdown `reports.py` has three copy-pasted renderers. Refactor so the row processing (name default, qty/price parsing, skipping negative qty, line totals, running total/count) lives in **one** place that all renderers use, then add a fourth renderer. Requirements: 1. `render_text`, `render_csv`, `render_html` keep their signatures and produce **byte-identical** output to today for every input (the grader compares against the original on hundreds of random inputs, including odd names and float prices). 2. No function in `reports.py` may be longer than 15 lines (def line to last line, inclusive), and the expression `round(qty * price, 2)` (or any `qty * price` multiplication) must appear exactly once in the file. 3. Add `render_markdown(title, rows, currency="EUR")` producing: ``` ## <title> | Name | Qty | Total | |---|---:|---:| | <name> | <qty> | <line_total with 2 decimals> <currency> | ... | **TOTAL** | <count> | **<total with 2 decimals> <currency>** | ``` followed by a final newline. In names, `|` is escaped as `\|`. Same row rules as the others (default name `(unnamed)`, negative qty rows skipped). Empty `rows` still prints the header and TOTAL lines. Standard library only. No network.

Refactor must preserve subtle behaviour (rounding of each line before summing, truncation with '~', CSV quoting, HTML escaping, string qty/price coercion) while meeting structural limits checked via AST. Original benchmark task written for usecaserank.com (not based on a specific public post). Headless, offline run on a reproducible fixture. Each run's notes say how its cost was measured (estimates are marked).

Success criteria: 1. legacy_identical: render_text/csv/html output is byte-identical to the original on 500 random inputs each. 2. functions_short: no function in reports.py is longer than 15 lines. 3. single_multiplication: `qty * price` appears exactly once in reports.py. 4. markdown_correct: render_markdown matches the specified format on 3 hidden inputs (pipe escaping, default name, skipped negative qty, empty rows, rounding).

Setup notes: Use Case Scout batch 5 case e08-refactor-report-formatters (offline fixture). Prepared with batch5/prepare.sh; hidden key/tests kept outside the agent's work dir. Prompt = TASK.md verbatim. Scored with the scout's scorer: `python score.py WORKDIR KEYDIR`. Tools: Read/Write/Edit/Glob/Grep/Bash, web disabled. Single run, no retries. Claude Code's own reported cost for claude-haiku-5.5: $0.009843. Score: 4/4 checks. Cost is an ESTIMATE: measured tokens x pricing.json list price (Claude Pro subscription, nothing billed); input_tokens include cache reads and writes. Single run.

Estimated cost List-price estimate; not actually billed.

Metrics

Estimated cost
$0.0098
Wall time
47s
Human step-ins
0
Turns
5
Model usage
ModelInput tokOutput tokCost
AClaude Haiku 5.5anthropic/claude-haiku-5.5effort default (no --effort flag) · thinking on125,83310,133$0.0098

Reproduce this run

  1. Use the use case prompt on the use case page.
  2. Same setup: Claude Haiku 5.5 (anthropic/claude-haiku-5.5, effort default (no --effort flag) · thinking on) via Claude Code 2.1.299 (headless -p), cloud.
  3. It counts as a success only if it meets every success criterion: 1. legacy_identical: render_text/csv/html output is byte-identical to the original on 500 random inputs each. 2. functions_short: no function in reports.py is longer than 15 lines. 3. single_multiplication: `qty * price` appears exactly once in reports.py. 4. markdown_correct: render_markdown matches the specified format on 3 hidden inputs (pipe escaping, default name, skipped negative qty, empty rows, rounding).
  4. Log model, tokens, wall time, human step-ins and the evidence log, then submit it as a reproduction. A different model? Submit a head-to-head rerun.

How runs are scored: Methodology.

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Automated checks

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Evidence log
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  "result": "`reports.py` is refactored and `render_markdown` is added. The three existing renderers match the original on all 9,000 differential comparisons (3,000 random inputs \u00d7 3 renderers), including the error cases.\n\n- **One place for row handling:** `_line_items(rows, tally)` is a generator that applies the name default, parses qty and price, skips negative qty, computes the line total, and updates the running total and count. Each renderer only formats its own output.\n- **Exception behaviour preserved:** rows are parsed one at a time, in the original order, so a bad row raises the same exception the original did. Collecting all rows first would have changed which error surfaced when several rows were bad.\n- **Constraints:** every function is 12 lines or fewer, and `round(qty * price, 2)` appears once in the file.\n- **Markdown:** `render_markdown` follows the spec. `|` in names becomes `\\|`, the default name is `(unnamed)`, negative-qty rows are skipped, and empty `rows` still prints the header and TOTAL lines. It ends with a newline.\n\nI checked the code with a scratch script in `/tmp/check` and did not add any test files to the work directory. The directory is not a git repo, so I did not commit.",
  "ttft_ms": 1541,
  "type": "result",
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  "uuid": "[REDACTED]",
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  "time_to_request_ms": 188,
  "first_content_frame_ms": 1418,
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]

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