execution-cost

An analysis workflow for estimating trading costs such as commissions, taxes, assumed slippage, and market impact. Slippage is the difference between an expected trading price and the price actually obtained; it does not provide full professional-level transaction-cost analysis.

In plain words
What is it for?
Use it to estimate costs for a planned trade or portfolio rebalance. It can organize assumptions, calculate supported cost components, show sensitivity to those assumptions, and list missing data such as detailed order-book information.
Why use it?
It makes the assumptions behind a cost estimate visible and identifies costs that cannot be measured with the available data. It avoids presenting rough estimates as exact execution results.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/travisun/opptrix/execution-cost
Any agent
npx skills add Travisun/Opptrix --skill execution-cost
Clone the repo
git clone --depth 1 https://github.com/Travisun/Opptrix

Made for: Claude Code, Codex.

Per session 53 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 926 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00053 $0.00926
Opus 5 $0.00026 $0.00463
Sonnet 5 $0.00011 $0.00185
Haiku 4.5 $0.00005 $0.00093

Measured 2d ago against content hash c3f8fabe50da, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

execution-cost 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 2d 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.

packages/agent-skills/builtin/execution-cost/SKILL.md · 67 lines

What it actually says

交易成本

何时使用

用户要理解 交易/再平衡的成本与执行摩擦(佣金、印花税、滑点粗估、冲击概念),而非下单或完整 TCA 报告。边界:再平衡差额用 @skill:rebalance;压力用 @skill:stress-test无 Level-2 / 专业 TCA 数据源——必须设诚实缺口专节,禁止假装机构级 TCA。

分析架构(投研方法)

  • 问题/假设:在用户给定费率与规模假设下,成本上界大概多少?哪些摩擦未建模?
  • 证据清单:持仓规模、用户费率/滑点假设、拟交易名义金额
  • 多维交叉验证:费率假设敏感性;规模相对日均成交(若用户提供)
  • 结论与不确定:计算结果依赖假设;非成交回报
  • 风险与缺口无 L2 TCA、无真实成交明细、无盘口
  • 事实 | 假设 | 推断 分栏强制

数据维度

维度 取数方向 缺失时
持仓/规模上下文 get_portfolio_holdings / portfolio_summary 仅按用户名义金额估算
费率与滑点假设 ask_user(必填关键假设) 给框架表,不做假精确 TCA
拟交易清单 用户 / 再平衡会话结果 ask_user
L2 / TCA 不可用 诚实缺口:写明无法做机构 TCA
交付 list_web_vendorcreate_web 用户只要口头要点时可跳过

步骤

  1. 确认分析对象:拟交易名义金额或再平衡差额。
  2. ask_user 收集费率、税、滑点粗假设;禁止填「市场默认精确值」冒充事实。
  3. 估算可算部分(佣金/税/假设滑点);列出未建模项。
  4. 诚实缺口专节:无 L2、无成交回报归因、无券商账单。
  5. 交付网页(默认)list_web_vendorcreate_web

网页报告建议目录

  1. 范围、时效与数据局限声明
  2. 输入假设表(费率/滑点/规模)
  3. 可估算成本表
  4. 敏感性(假设变动)
  5. 诚实缺口:无 L2 TCA
  6. 事实 | 假设 | 推断分栏
  7. 免责声明(非成交建议;非券商账单)

禁止

  • 假装完整 TCA / L2 冲击模型
  • 荐股或保证「成本只有 X」
  • 禁止无交付就结束(默认须有 web 产物,除非用户明确只要口头要点)
  • 隐瞒不可用数据
  • assumption / not-feasible 须诚实降级
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. 2d ago First seen · 67 lines · 53 tokens per session scan A c3f8fabe50da

Subscribe to this mod's changes

execution-cost is a skill published in the GitHub repository Travisun/Opptrix (224 stars, last pushed 4d ago), licensed Apache-2.0. It adds 53 tokens to every session and 926 once invoked, about $0.0003 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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