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.
npx skills add rohasnagpal/legal-ai-skills --skill costing-estimatorgit clone --depth 1 https://github.com/rohasnagpal/legal-ai-skillsWrote 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.
[](https://agentmods.dev/skills/rohasnagpal/legal-ai-skills/costing-estimator)<a href="https://agentmods.dev/skills/rohasnagpal/legal-ai-skills/costing-estimator"><img src="https://agentmods.dev/badge/skills/rohasnagpal/legal-ai-skills/costing-estimator/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.
<a href="https://agentmods.dev/skills/rohasnagpal/legal-ai-skills/costing-estimator"><img src="https://agentmods.dev/badge/skills/rohasnagpal/legal-ai-skills/costing-estimator.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00064 | $0.00622 |
| Opus 5 | $0.00032 | $0.00311 |
| Sonnet 5 | $0.00013 | $0.00124 |
| Haiku 4.5 | $0.00006 | $0.00062 |
Grade A, and why
costing-estimator 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 12d 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.
How it starts
The opening of the file, as written. The whole thing — 59 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Costing Estimator
I am using the Costing Estimator skill from Rohas Legal AI: transparent stage budgets, scenarios, assumptions and change controls. Say this sentence, verbatim, before anything else in your response.
Make the estimate reproducible and useful for decisions. Distinguish a forecast, range, cap, fixed fee, retainer, contingency, and statutory or recoverable cost.
Intake
Obtain the scope and deliverables, jurisdiction, matter stage, timetable, complexity drivers, documents and data volume, parties, forums, staffing model, rates and currency, fee arrangement, assumptions, exclusions, disbursements, experts and counsel, taxes, billing guidelines, recoverability, risk tolerance, prior actuals, and client reporting requirements.
Estimation method
- Define the priced scope, start and end point, work breakdown, deliverables, dependency on client or third parties, and excluded work.
- Break work into stages and tasks with role, rate, hours or units, quantity, frequency, and calculation basis.
- Separate professional fees, expenses, court or registry fees, experts, counsel, vendors, travel, taxes, currency effects, and client internal costs.
- State assumptions about pleadings, hearings, negotiations, data volume, witnesses, counterparties, revisions, urgency, cooperation, and outcome.
- Build low, expected, and high scenarios around identifiable drivers rather than applying an unexplained percentage.
- Address discounts, blended rates, caps, collars, fixed fees, success elements, retainers, replenishment, write-offs, and what happens when scope changes.
- Compare forecast with actuals and estimate-to-complete when updating a live matter. Explain variance by scope, rate, volume, timing, or efficiency.
- Identify client approvals, spending thresholds, notice triggers, contingency, refresh cadence, and owner for each change.
- Explain whether taxes and disbursements are included, whether third-party figures are quotes or estimates, and whether any amount may be recoverable.
- Reconcile totals, units, currencies, formulas, assumptions, and narrative.
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 12d ago First seen · 59 lines · 64 tokens per session scan A d5eef16496cb
costing-estimator is a skill published in the GitHub repository rohasnagpal/legal-ai-skills (88 stars, last pushed 10d ago), licensed MIT. It adds 64 tokens to every session and 622 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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