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Agent skill

Triangulated Fx Rates

by benchflow-ai in benchflow-ai/skillsbench

Reference for multi-hop / triangulated currency conversion on batch rate tapes.

Apache-2.0Auto-check passed

Install Triangulated Fx Rates

skills CLI
$ npx skills add benchflow-ai/skillsbench --skill triangulated-fx-rates -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install benchflow-ai/skillsbench triangulated-fx-rates --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ 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/triangulated-fx-rates .claude/skills/triangulated-fx-rates && rm -rf skills-src

Use ~/.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/

Facts

Skill name
triangulated-fx-rates
GitHub stars
1.8k
Token cost
~1.3k tokens
SKILL.md length
581 words
Files
1
Skills in repo
189
Repo updated
First seen
Licence
Apache-2.0

At a glance

Reference for multi-hop / triangulated currency conversion on batch rate tapes.

  • Works in 2 steps: No multiply at all — the via is read… → Single-hop only — the first via is…
  • SKILL.md covers The via chain can be longer…, Failure modes, Rounding and Control flow (placeholder names), plus 2 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Triangulated Fx Rates is an agent skill from benchflow-ai/skillsbench. Reference for multi-hop / triangulated currency conversion on batch rate tapes. When a rate row carries an explicit "via" currency, the row's rate is only one leg of the conversion, and the via currency may ITSELF be quoted through another via — so the effective rate is the product of every leg, resolved by walking the chain until a direct quote is reached. Useful when an FX feed lists some pairs directly to the reporting currency and others as triangulated (or doubly-triangulated) quotes through vehicle…

Its SKILL.md is about 1.3k 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

  • “currency, the row”
  • “/triangulated-fx-rates”

Requirements

  • Python 3

Workflow steps

2 steps, taken from the first numbered list in SKILL.md.

  1. No multiply at all — the via is read into a field but the row rate is
  2. Single-hop only — the first via is multiplied in, but the code assumes

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

Triangulated Fx Rates loads about 1.3k tokens when it runs. Until then it costs about 136 tokens; SKILL.md has 581 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~136
When it runs · the whole SKILL.md, loaded when a task matches
~1.3k

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). 581 words, ~1,323 tokens.

Download SKILL.mdSave it as .claude/skills/triangulated-fx-rates/SKILL.md (or your agent's skills folder).
name
triangulated-fx-rates
description
Reference for multi-hop / triangulated currency conversion on batch rate tapes. When a rate row carries an explicit "via" currency, the row's rate is only one leg of the conversion, and the via currency may ITSELF be quoted through another via — so the effective rate is the product of every leg, resolved by walking the chain until a direct quote is reached. Useful when an FX feed lists some pairs directly to the reporting currency and others as triangulated (or doubly-triangulated) quotes through vehicle currencies.

Triangulated FX rates

Most rate feeds list a direct rate to the reporting currency (typically USD). Less liquid currencies are often quoted through a more liquid vehicle currency (commonly EUR or USD itself). On a batch rate tape this is encoded as a second "via" column on the same row:

CCY  RATE     VIA
USD  1.0000
EUR  1.0850
GBP  1.2750
CHF  0.9200   EUR     <-- CHF -> EUR is the first hop
ZAR  0.0650   EUR     <-- ZAR -> EUR is the first hop
BRL  0.3000   ZAR     <-- BRL -> ZAR -> EUR -> USD : TWO via hops
JPY  0.0064

A blank VIA column means the row is already a direct quote against the reporting currency. A non-blank VIA column means the row gives the rate from CCY to VIA — and you still need to convert from VIA to the reporting currency.

The via chain can be longer than one hop

This is the part that is easy to get wrong. The via currency named on a row is not guaranteed to be a direct quote — it may have its own non-blank via column, which in turn may have another, and so on. A single via lookup is therefore only correct when the via happens to be direct. To get a correct effective rate you must follow the chain: keep multiplying in the next leg's primary rate, moving to that leg's via, until you reach a row whose via is blank (a true direct quote against the reporting currency).

effective_rate(CCY) = primary(CCY) × primary(via(CCY)) × primary(via(via(CCY))) × …
                      ────────────────────────────────────────────────────────────
                      until the via column is blank (a direct quote)

Worked examples against the table above:

  • One hop (CHF): CHF→EUR is 0.9200, EUR is direct (1.0850). 0.9200 × 1.0850 = 0.99820 → 0.9982 (4dp).
  • Two hops (BRL): BRL→ZAR is 0.3000, ZAR→EUR is 0.0650, EUR is direct (1.0850). 0.3000 × 0.0650 × 1.0850 = 0.0211575 → 0.0212 (4dp). Stopping after the first via (treating ZAR's 0.0650 as if it were ZAR→USD) gives 0.3000 × 0.0650 = 0.0195, wrong by the whole EUR leg.

Failure modes

Two distinct defects show up here:

  1. No multiply at all — the via is read into a field but the row rate is used verbatim. Triangulated currencies are then off by a multiplicative factor equal to the rest of the chain.
  2. Single-hop only — the first via is multiplied in, but the code assumes that via is always direct and never checks whether the via has its own via. One-hop currencies look correct; multi-hop currencies are wrong by every leg past the first. This one is subtle because the common currencies are usually one hop, so it passes casual inspection.
Show full SKILL.md (217 more words)Show less

Rounding

Carry the running product at full precision (enough decimals that no intermediate leg is truncated — the product of N four-decimal rates has up to 4·N decimals) and round once at the end to the rate field's precision (typically 4 decimals) with COMPUTE … ROUNDED (half-away-from-zero in COBOL, matching Python Decimal ROUND_HALF_UP). Rounding each leg to the rate-field precision before the next multiply corrupts low-rate currencies.

Control flow (placeholder names)

Resolve the rate with a loop that walks the chain, not a one-shot via lookup. Sketched with generic names — substitute your own rate-table and working-storage identifiers:

cobol
       *> placeholders: acc is a wide running product, cur is the currency
       *> currently being resolved, leg/leg-via come from the matched row.
       acc := 1
       cur := <currency to price>
       REPEAT
           (leg, leg-via) := primary-rate and via of the row matching cur
           acc := acc * leg                 *> carry full precision, no per-hop round
           IF leg-via is blank
               done
           ELSE
               cur := leg-via               *> follow the chain one more hop
           END-IF
       UNTIL done
       eff := ROUND(acc) to the rate-field precision

A guard on the maximum number of hops is prudent so a malformed (cyclic) via column cannot loop forever. How you store acc/eff and which field you round into depend on your program's own declarations.

Verification tip

Pick the currency with the longest via chain and compute its effective rate by hand, multiplying every leg through to the direct quote, then reconcile against one account whose balance is entirely in that currency. If single-hop currencies reconcile but the multi-hop one is off by a clean constant factor, the chain is being cut short after the first via.

References

  • ISO 4217 currency codes used in the CCY / VIA columns
  • IBM Enterprise COBOL Language Reference for COMPUTE … ROUNDED semantics and PIC … V… decimal alignment

© 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/triangulated-fx-rates of benchflow-ai/skillsbench.

Open the folder on GitHubat commit 9a1f4dd

Compare with similar skills

Triangulated Fx Rates 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.

Triangulated Fx Rates compared with similar skills
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Currency Ratesmohitagw15856/pm-claude-skills1.4k—~1.1kAutomated safety check: PassMIT
Batchasgeirtj/system_prompts_leaks69k—~1.3kAutomated safety check: PassCC0-1.0
Modeling Conversion MetricsPostHog/posthog40k—~1.4kAutomated safety check: PassCustom licence
Batchcodewhale-hq/Codewhale41k—~157Automated safety check: PassMIT
Conversion Rate Optimizationmohitagw15856/pm-claude-skills1.4k—~1kAutomated safety check: PassMIT

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Questions about Triangulated Fx Rates

What does Triangulated Fx Rates do?

Reference for multi-hop / triangulated currency conversion on batch rate tapes. Triangulated Fx Rates is an agent skill from benchflow-ai/skillsbench. Reference for multi-hop / triangulated currency conversion on batch rate tapes.

How do I install Triangulated Fx Rates in Claude Code?

Run `npx skills add benchflow-ai/skillsbench --skill triangulated-fx-rates -a claude-code`. Or copy the skill folder (tasks-extra/cobol-gl-batch-reconcile/environment/skills/triangulated-fx-rates in benchflow-ai/skillsbench) into .claude/skills/triangulated-fx-rates in your project. Claude Code loads it when a task matches its description.

How do I install Triangulated Fx Rates in Codex?

Run `npx skills add benchflow-ai/skillsbench --skill triangulated-fx-rates -a codex`. Or copy the skill folder (tasks-extra/cobol-gl-batch-reconcile/environment/skills/triangulated-fx-rates in benchflow-ai/skillsbench) into .agents/skills/triangulated-fx-rates in your project. Codex loads it when a task matches its description.

Can I use Triangulated Fx Rates 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 triangulated-fx-rates -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/triangulated-fx-rates, .gemini/skills/triangulated-fx-rates, .github/skills/triangulated-fx-rates and .opencode/skills/triangulated-fx-rates in your project.

What does Triangulated Fx Rates need to run?

SKILL.md names no scripts, command-line tools or credentials: Triangulated Fx Rates is instructions for the agent only. Our summary lists: Python 3.

Does Triangulated Fx Rates 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 Triangulated Fx Rates 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 Triangulated Fx Rates use?

Triangulated Fx Rates 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 Triangulated Fx Rates use?

About 1.3k tokens (SKILL.md is roughly 5.3k 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 Triangulated Fx Rates?

Skills that share tags, products or a category with Triangulated Fx Rates: Currency Rates (mohitagw15856/pm-claude-skills, 1.4k stars), Batch (asgeirtj/system_prompts_leaks, 69k stars), Modeling Conversion Metrics (PostHog/posthog, 40k stars) and Batch (codewhale-hq/Codewhale, 41k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Triangulated Fx Rates?

benchflow-ai (a GitHub organization) maintains it in benchflow-ai/skillsbench, which has 1,835 GitHub stars. The repository holds 189 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.