Ecc Conventions
affaan-m/ECC
Development conventions and patterns for ECC. An agent skill from affaan-m/ECC.
Reference for the EBCDIC "overpunch" / zoned-decimal sign convention where the units position of a numeric field is replaced with a letter that encodes both a digit and a sign.
Apache-2.0Auto-check passed
Install Ebcdic Overpunch Decoding
$ npx skills add benchflow-ai/skillsbench --skill ebcdic-overpunch-decoding -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install benchflow-ai/skillsbench ebcdic-overpunch-decoding --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/benchflow-ai/skillsbench.git skills-src && mkdir -p .claude/skills && cp -r skills-src/tasks-extra/cobol-gl-batch-reconcile/environment/skills/ebcdic-overpunch-decoding .claude/skills/ebcdic-overpunch-decoding && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "ebcdic-overpunch-decoding" agent skill from https://github.com/benchflow-ai/skillsbench/tree/main/tasks-extra/cobol-gl-batch-reconcile/environment/skills/ebcdic-overpunch-decoding into .claude/skills/ebcdic-overpunch-decoding/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ebcdic-overpunch-decoding", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/benchflow-ai/skillsbench/tree/main/tasks-extra/cobol-gl-batch-reconcile/environment/skills/ebcdic-overpunch-decodingType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add benchflow-ai/skillsbench --skill ebcdic-overpunch-decoding -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install benchflow-ai/skillsbench ebcdic-overpunch-decoding --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/benchflow-ai/skillsbench.git skills-src && mkdir -p .agents/skills && cp -r skills-src/tasks-extra/cobol-gl-batch-reconcile/environment/skills/ebcdic-overpunch-decoding .agents/skills/ebcdic-overpunch-decoding && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "ebcdic-overpunch-decoding" agent skill from https://github.com/benchflow-ai/skillsbench/tree/main/tasks-extra/cobol-gl-batch-reconcile/environment/skills/ebcdic-overpunch-decoding into .agents/skills/ebcdic-overpunch-decoding/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ebcdic-overpunch-decoding", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add benchflow-ai/skillsbench --skill ebcdic-overpunch-decoding -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install benchflow-ai/skillsbench ebcdic-overpunch-decoding --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/benchflow-ai/skillsbench.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/tasks-extra/cobol-gl-batch-reconcile/environment/skills/ebcdic-overpunch-decoding .cursor/skills/ebcdic-overpunch-decoding && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "ebcdic-overpunch-decoding" agent skill from https://github.com/benchflow-ai/skillsbench/tree/main/tasks-extra/cobol-gl-batch-reconcile/environment/skills/ebcdic-overpunch-decoding into .cursor/skills/ebcdic-overpunch-decoding/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ebcdic-overpunch-decoding", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/benchflow-ai/skillsbench.git --path tasks-extra/cobol-gl-batch-reconcile/environment/skills/ebcdic-overpunch-decoding--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add benchflow-ai/skillsbench --skill ebcdic-overpunch-decoding -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install benchflow-ai/skillsbench ebcdic-overpunch-decoding --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/benchflow-ai/skillsbench.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/tasks-extra/cobol-gl-batch-reconcile/environment/skills/ebcdic-overpunch-decoding .gemini/skills/ebcdic-overpunch-decoding && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "ebcdic-overpunch-decoding" agent skill from https://github.com/benchflow-ai/skillsbench/tree/main/tasks-extra/cobol-gl-batch-reconcile/environment/skills/ebcdic-overpunch-decoding into .gemini/skills/ebcdic-overpunch-decoding/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ebcdic-overpunch-decoding", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install benchflow-ai/skillsbench ebcdic-overpunch-decodingInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add benchflow-ai/skillsbench --skill ebcdic-overpunch-decoding -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/benchflow-ai/skillsbench.git skills-src && mkdir -p .github/skills && cp -r skills-src/tasks-extra/cobol-gl-batch-reconcile/environment/skills/ebcdic-overpunch-decoding .github/skills/ebcdic-overpunch-decoding && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "ebcdic-overpunch-decoding" agent skill from https://github.com/benchflow-ai/skillsbench/tree/main/tasks-extra/cobol-gl-batch-reconcile/environment/skills/ebcdic-overpunch-decoding into .github/skills/ebcdic-overpunch-decoding/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ebcdic-overpunch-decoding", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add benchflow-ai/skillsbench --skill ebcdic-overpunch-decoding -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install benchflow-ai/skillsbench ebcdic-overpunch-decoding --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/benchflow-ai/skillsbench.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/tasks-extra/cobol-gl-batch-reconcile/environment/skills/ebcdic-overpunch-decoding .opencode/skills/ebcdic-overpunch-decoding && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "ebcdic-overpunch-decoding" agent skill from https://github.com/benchflow-ai/skillsbench/tree/main/tasks-extra/cobol-gl-batch-reconcile/environment/skills/ebcdic-overpunch-decoding into .opencode/skills/ebcdic-overpunch-decoding/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ebcdic-overpunch-decoding", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
ebcdic-overpunch-decoding- GitHub stars
- 1.8k
- Token cost
- ~1k tokens
- SKILL.md length
- 400 words
- Files
- 1
- Skills in repo
- 178
- Repo updated
- First seen
- Licence
- Apache-2.0
At a glance
Reference for the EBCDIC "overpunch" / zoned-decimal sign convention where the units position of a numeric field is replaced with a letter that encodes both a digit and a sign.
- SKILL.md covers Sign and digit table, A common defect, Decoding pattern (placeholder… and Verification tip, plus 1 more section
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Ebcdic Overpunch Decoding is an agent skill from benchflow-ai/skillsbench. Reference for the EBCDIC "overpunch" / zoned-decimal sign convention where the units position of a numeric field is replaced with a letter that encodes both a digit and a sign. Useful when reading mainframe-style fixed-length tapes whose amount fields appear as digits followed by a letter (e.g. "0000000000123D" or "0000000000045M").
Its SKILL.md is about 1k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
The repository describes itself as: SkillsBench evaluates how well skills work and how effective agents are at using them. The licence is Apache-2.0.
Example prompts
- “overpunch”
- “0000000000123D”
- “0000000000045M”
- “/ebcdic-overpunch-decoding”
What it can do on your machine
Read from SKILL.md and the folder at commit 9a1f4dd. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are cobol).
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Ebcdic Overpunch Decoding loads about 1k tokens when it runs. Until then it costs about 90 tokens; SKILL.md has 400 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from benchflow-ai/skillsbench at commit 9a1f4dd, republished under its Apache-2.0 licence (© benchflow-ai). 400 words, ~1,009 tokens.
Download SKILL.mdSave it as
.claude/skills/ebcdic-overpunch-decoding/SKILL.md (or your agent's skills folder).- name
- ebcdic-overpunch-decoding
- description
- Reference for the EBCDIC "overpunch" / zoned-decimal sign convention where the units position of a numeric field is replaced with a letter that encodes both a digit and a sign. Useful when reading mainframe-style fixed-length tapes whose amount fields appear as digits followed by a letter (e.g. "0000000000123D" or "0000000000045M").
EBCDIC overpunch (zoned decimal sign)
On classic mainframe tapes, signed numeric amounts are stored as N-1 digits followed by a single byte where the high-order bits carry the sign and the low-order bits carry the final decimal digit. When the file is converted to ASCII / printable form, the last byte is rendered as a letter (or a brace).
Sign and digit table
| Char | Sign | Last digit | Char | Sign | Last digit | |
|---|---|---|---|---|---|---|
{ | + | 0 | } | − | 0 | |
A | + | 1 | J | − | 1 | |
B | + | 2 | K | − | 2 | |
C | + | 3 | L | − | 3 | |
D | + | 4 | M | − | 4 | |
E | + | 5 | N | − | 5 | |
F | + | 6 | O | − | 6 | |
G | + | 7 | P | − | 7 | |
H | + | 8 | Q | − | 8 | |
I | + | 9 | R | − | 9 |
Positive zero is {; negative zero is }. Both decode to magnitude 0 — keep
the sign attached so downstream arithmetic doesn't drop a debit's polarity.
A common defect
The positive half of the table ({, A–I) is the visible-looking case and
is often handled first. The negative half (}, J–R) looks like ordinary
letters and is easy to forget. If only the positive letters are decoded,
debits and credits both come through as positive — the totals look plausible
but signs are wrong on every negative row.
Show full SKILL.md (210 more words)Show less
Decoding pattern (placeholder names)
Split the field into the leading digits and the overpunch byte, look up the sign + units digit from the table above, recombine, then build the signed working-storage value. The shape below uses generic identifiers — substitute your own field names:
*> placeholders: digits-buf holds the recombined unsigned digits,
*> op-char is the overpunch byte, sgn / lo-digit are scratch.
split raw-amount into (leading-digits, op-char)
EVALUATE op-char
WHEN "{" sgn := "+" lo-digit := 0 *> positive zero
WHEN "A" THRU "I" sgn := "+" lo-digit := 1..9
WHEN "}" sgn := "-" lo-digit := 0 *> negative zero
WHEN "J" THRU "R" sgn := "-" lo-digit := 1..9
END-EVALUATE
digits-buf := leading-digits with lo-digit appended
signed-value := (sgn = "-") ? -digits-buf : +digits-bufThe decisive point is that the EVALUATE must cover both halves of the
table — the negative letters } and J–R as well as the positive
{/A–I. The exact PIC clauses and MOVE targets depend on your own
record layout; what matters is that no overpunch character falls through
undecoded.
Some shops use COBOL's SIGN IS TRAILING SEPARATE / SIGN IS TRAILING
clauses with native EBCDIC zoned data, but on ASCII-converted tapes the
characters above are literally what you read — explicit lookup is the
clearest decode.
Verification tip
Pick one positive and one negative row from the tape, decode by hand using the table, and reconcile against an expected total. If only the positive side works you will see plausible magnitudes but inverted aggregate signs.
References
- IBM Enterprise COBOL Language Reference — "Zoned decimal" / "USAGE
DISPLAY" with
SIGN IS …clauses. - IBM Knowledge Center: "Signed zoned decimal numbers" (overpunch table for
positive
{ A B C D E F G H Iand negative} J K L M N O P Q R).
© benchflow-ai, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in tasks-extra/cobol-gl-batch-reconcile/environment/skills/ebcdic-overpunch-decoding of benchflow-ai/skillsbench.
Open the folder on GitHubat commit 9a1f4dd
Compare with similar skills
Ebcdic Overpunch Decoding next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Ebcdic Overpunch Decoding this skillbenchflow-ai/skillsbench | 1.8k | — | ~1k | Automated safety check: Pass | Apache-2.0 | |
| Ecc Conventionsaffaan-m/ECC | 275k | — | ~2.8k | Automated safety check: Pass | MIT | |
| Document Signingasgeirtj/system_prompts_leaks | 69k | — | ~1.5k | Automated safety check: Pass | CC0-1.0 | |
| Evm Token Decimalsaffaan-m/ECC | 275k | 2 repos | ~997 | Automated safety check: Pass | MIT | |
| Naming Conventionsthedaviddias/Front-End-Checklist | 74k | — | ~481 | Automated safety check: Pass | MIT | |
| Conventional CommitJanDeDobbeleer/oh-my-posh | 24k | — | ~1.2k | Automated safety check: Notes | MIT |
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Document Signing
asgeirtj/system_prompts_leaks
Review documents for signature or prepare a signing packet; verify fields and recipients while keeping sending and signing under explicit user authorization.
Evm Token Decimals
affaan-m/ECC
Prevent silent decimal mismatch bugs across EVM chains. An agent skill from affaan-m/ECC.
Naming Conventions
thedaviddias/Front-End-Checklist
A skill your agent uses when reviewing stylesheets, component styles, and responsive behavior related to Use consistent CSS naming conventions.
Conventional Commit
JanDeDobbeleer/oh-my-posh
Workflow for generating conventional commit messages following the Conventional Commits specification.
- Official
Backend Conventions
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Sentry backend conventions for logging, tracing/spans, span/tag attribute naming, metrics tags, and the options system.
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Questions about Ebcdic Overpunch Decoding
What does Ebcdic Overpunch Decoding do?
Reference for the EBCDIC "overpunch" / zoned-decimal sign convention where the units position of a numeric field is replaced with a letter that encodes both a digit and a sign. Ebcdic Overpunch Decoding is an agent skill from benchflow-ai/skillsbench. Reference for the EBCDIC "overpunch" / zoned-decimal sign convention where the units position of a numeric field is replaced with a letter that encodes both a digit and a sign.
How do I install Ebcdic Overpunch Decoding in Claude Code?
Run `npx skills add benchflow-ai/skillsbench --skill ebcdic-overpunch-decoding -a claude-code`. Or copy the skill folder (tasks-extra/cobol-gl-batch-reconcile/environment/skills/ebcdic-overpunch-decoding in benchflow-ai/skillsbench) into .claude/skills/ebcdic-overpunch-decoding in your project. Claude Code loads it when a task matches its description.
How do I install Ebcdic Overpunch Decoding in Codex?
Run `npx skills add benchflow-ai/skillsbench --skill ebcdic-overpunch-decoding -a codex`. Or copy the skill folder (tasks-extra/cobol-gl-batch-reconcile/environment/skills/ebcdic-overpunch-decoding in benchflow-ai/skillsbench) into .agents/skills/ebcdic-overpunch-decoding in your project. Codex loads it when a task matches its description.
Can I use Ebcdic Overpunch Decoding in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add benchflow-ai/skillsbench --skill ebcdic-overpunch-decoding -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/ebcdic-overpunch-decoding, .gemini/skills/ebcdic-overpunch-decoding, .github/skills/ebcdic-overpunch-decoding and .opencode/skills/ebcdic-overpunch-decoding in your project.
What does Ebcdic Overpunch Decoding need to run?
SKILL.md names no scripts, command-line tools or credentials: Ebcdic Overpunch Decoding is instructions for the agent only.
Does Ebcdic Overpunch Decoding access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Ebcdic Overpunch Decoding safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Ebcdic Overpunch Decoding use?
Ebcdic Overpunch Decoding is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Ebcdic Overpunch Decoding use?
About 1k tokens (SKILL.md is roughly 4k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Ebcdic Overpunch Decoding?
Skills that share tags, products or a category with Ebcdic Overpunch Decoding: Ecc Conventions (affaan-m/ECC, 275k stars), Document Signing (asgeirtj/system_prompts_leaks, 69k stars), Evm Token Decimals (affaan-m/ECC, 275k stars) and Naming Conventions (thedaviddias/Front-End-Checklist, 74k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Ebcdic Overpunch Decoding?
benchflow-ai (a GitHub organization) maintains it in benchflow-ai/skillsbench, which has 1,832 GitHub stars. The repository holds 178 skills in this directory. The repository was last updated on July 23, 2026.
Source: benchflow-ai/skillsbench on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.