What is cost-of-capital?

A tool for estimating a US company’s cost of equity, cost of debt, weighted average cost of capital (WACC), and economic profit from its financial data. WACC is the blended return a company needs to justify its use of debt and equity financing.

Use it to estimate a company’s WACC or cost of equity, compare results across interest-rate and risk-premium assumptions, and calculate economic profit.

It provides valuation hurdle rates while keeping the risk-free rate, equity risk premium, tax rate, and historical filing data explicit.

cost-of-capital — Skill for Claude Code by BlueWaterCorp

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.

Any agent

npx skills add BlueWaterCorp/RiskModels_API --skill cost-of-capital

Clone the repo

git clone --depth 1 https://github.com/BlueWaterCorp/RiskModels_API

Made for: Claude Code.

Or install riskmodels, the plugin that ships this one along with the rest of its 5 skills, 5 commands, 1 agent.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/bluewatercorp/riskmodels_api/cost-of-capital/github.svg)](https://agentmods.dev/skills/bluewatercorp/riskmodels_api/cost-of-capital)

Your own site

<a href="https://agentmods.dev/skills/bluewatercorp/riskmodels_api/cost-of-capital"><img src="https://agentmods.dev/badge/skills/bluewatercorp/riskmodels_api/cost-of-capital/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/bluewatercorp/riskmodels_api/cost-of-capital"><img src="https://agentmods.dev/badge/skills/bluewatercorp/riskmodels_api/cost-of-capital.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 83 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 797 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.

Model	Per session	Once invoked
Fable 5.1	$0.00083	$0.00797
Opus 5	$0.00042	$0.00398
Sonnet 5	$0.00017	$0.00159
Haiku 4.5	$0.00008	$0.00080

Measured 7d ago against content hash e9cdc3f9082f, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

cost-of-capital 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 7d 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-plugin/plugins/riskmodels/skills/cost-of-capital/SKILL.md · 60 lines

How it starts

The opening of the file, as written. The whole thing — 60 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Cost of capital (CAPM mode)

Report a name's cost of capital from its PIT fundamentals. Cost of equity is CAPM: risk-free rate at the chosen tenor plus the ERM3 conditional market beta times the caller-supplied equity risk premium. WACC uses book-value weights. This skill wraps the hosted RiskModels MCP and reports its outputs — it computes nothing itself.

What to call

riskmodels_get_fundamentals — the cost-of-capital layer rides on this tool. Relevant params:
- erp — the equity risk premium. Always caller-supplied — never hardcode or assume one. If the user did not give an ERP, ask for it or report across the grid; state the ERP used in every answer.
- rf_tenor — Treasury constant-maturity tenor for the risk-free rate (3m|1y|2y|5y|10y|30y, default 10y, the long-duration valuation convention).
- tax_rate — applied to the WACC debt shield (default 0.21).
- grid=true with erp_grid / rf_tenor_grid — returns the sensitivity table of cost_of_equity / wacc / economic_profit across every ERP × tenor cell, instead of a single scalar. Prefer the grid when the user has not fixed an ERP.

Reading the response

cost_of_equity = rf_rate + beta_market × erp (CAPM). Because beta_market is a short-half-life conditional beta, for defensive names cost_of_equity can fall below the risk-free rate — that is a property of the conditional beta, not an error. State it plainly rather than "correcting" it.
wacc uses book-value weights (balance-sheet equity and debt). The textbook convention is market-value weights; say so, and note the user can reweight if they have market caps.
economic_profit scales with book equity; pair it with roe_ttm − cost_of_equity (the equity-charge spread) when comparing across market caps.
A short rf_tenor (3m/1y) should be paired with a bill-basis ERP, or cost of capital is understated. Surface the tenor you used.

Boundary

Read the full file on GitHub · 60 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.

7d ago First seen · 60 lines · 83 tokens per session scan A e9cdc3f9082f

Subscribe to this mod's changes

cost-of-capital is a skill published in the GitHub repository BlueWaterCorp/RiskModels_API (0 stars, last pushed today), licensed Apache-2.0. It adds 83 tokens to every session and 797 once invoked, about $0.0004 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 2026-09-04.

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