# Tools

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Type Skill, Resources for QA or ML / AI or Data analysis or Finance / Accounting: 138 items.

> - QA: Functional testing, test automation and quality assurance.
> - ML / AI: Model training, evaluation and LLM application development.
> - Data analysis: Querying, statistical analysis, reporting and visualization.
> - Finance / Accounting: Bookkeeping, reconciliation, financial statements, budgets and tax.

- [Skill Creator](https://hebbmind.com/skill/skill-creator.md): [Skill] Guides the agent through writing or improving a skill: clarify intent, draft SKILL.md, run scored evals with and without the skill, then tune the description so it triggers accurately. Official Anthropic skill.
- [PDF](https://hebbmind.com/skill/pdf.md): [Skill] Extracts text and tables from PDFs; merges, splits and rotates pages, adds watermarks, fills forms and OCRs scanned documents. The official Anthropic skill behind Claude's document features; source-available, not open source.
- [Browser Use](https://hebbmind.com/skill/browser-use.md): [Skill] Controls your local Chrome over CDP to navigate, click, type, take screenshots and scrape data, reusing logged-in sessions. Official browser-use skill; install the browser-use CLI with uv first.
- [Scientific Agent Skills](https://hebbmind.com/skill/scientific-agent-skills.md): [Skill] 166 research skills maintained by K-Dense (formerly Claude Scientific Skills), spanning bioinformatics, cheminformatics, clinical research, materials and physics, including unified access to 78 public databases such as PubChem and UniProt. Works with Claude Code, Codex and Cursor.
- [Knowledge Work Plugins](https://hebbmind.com/skill/knowledge-work-plugins.md): [Skill] Anthropic's role-based skill collection covering sales, finance, legal, HR, support, marketing, product, design, operations and data analysis: over a hundred skills you can install one at a time. Works best with CRM, data warehouse and other connectors.
- [Trail of Bits Skills](https://hebbmind.com/skill/trailofbits-skills.md): [Skill] Skills from security firm Trail of Bits: 40+ plugins for code auditing, CodeQL and Semgrep static analysis, differential review, smart-contract and cryptography audits, fuzzing and more. Also installable as a Claude Code or Codex plugin marketplace.
- [Test-Driven Development](https://hebbmind.com/skill/test-driven-development.md): [Skill] Forces red-green-refactor: write a test and watch it fail, then write the minimum code to pass. Any code written without a verified failing test gets deleted and redone. From the Superpowers workflow.
- [Diagnosing Bugs](https://hebbmind.com/skill/diagnosing-bugs.md): [Skill] A disciplined process for hard bugs and performance regressions: build a reliable reproduction loop, reproduce and minimize, form hypotheses, instrument to verify, then fix and add a regression test, redacting secrets in output. By Matt Pocock.
- [Customer Billing Ops](https://hebbmind.com/skill/customer-billing-ops.md): [Skill] Resolves subscription billing issues: checks customer and subscription state, separates duplicate purchases, team seats and failed payments, restores self-serve before refunding, and drafts the reply. Needs Stripe or similar tools connected; refunds move real money, so review them.
- [webapp-testing](https://hebbmind.com/skill/webapp-testing.md): [Skill] Drives local web apps with Python Playwright scripts to verify features, debug the UI, take screenshots and read browser logs. Includes helper scripts to start and stop dev servers. Official Anthropic skill.
- [XLSX](https://hebbmind.com/skill/xlsx.md): [Skill] Creates, edits and analyzes Excel spreadsheets: formulas, formatting, charts and data cleaning, plus conversion between CSV, TSV and other tabular formats. The official Anthropic skill behind Claude's document features; source-available, not open source.
- [Claude API](https://hebbmind.com/skill/claude-api.md): [Skill] Reference for the Claude API and Anthropic SDK: model selection and pricing, streaming, tool use, prompt caching, Managed Agents and more, plus workflows for model migration and prompt audits. Official Anthropic skill.
- [MCP Builder](https://hebbmind.com/skill/mcp-builder.md): [Skill] Guides agents in building quality MCP servers: research the protocol and target API, design tools, implement with Python (FastMCP) or the TypeScript SDK, and write evaluation questions to test the result. Official Anthropic skill.
- [gstack](https://hebbmind.com/skill/gstack.md): [Skill] Skill pack from YC president Garry Tan: slash commands such as /office-hours, /plan-ceo-review, /review, /qa and /ship play CEO, engineering manager, designer, QA and release engineer. Needs Git and Bun; clone the repo and run ./setup as the README describes.
- [Agent Skills (Addy Osmani)](https://hebbmind.com/skill/addyosmani-agent-skills.md): [Skill] Engineering skill collection spanning define, plan, build, verify, review and ship, with /spec, /plan, /build, /test, /review and /ship commands, including TDD, code review and web performance audits. By Addy Osmani.
- [Invoice Organizer](https://hebbmind.com/skill/invoice-organizer.md): [Skill] Reads messy invoices and receipts (PDFs, scans, screenshots), extracts vendor, date and amount, renames and files them by vendor, category or year, keeps originals and can export a CSV for your accountant. Needs an agent with local file access; no account required.
- [Database Lookup](https://hebbmind.com/skill/database-lookup.md): [Skill] Unified database lookup skill from K-Dense's scientific collection: reproducibly queries about 80 public database APIs such as PubChem, UniProt, ChEMBL, ClinicalTrials.gov and FRED, returning traceable results with endpoints, parameters and count checks. Some need API keys.
- [Scanpy Single-Cell Analysis](https://hebbmind.com/skill/scanpy.md): [Skill] Teaches agents standard single-cell RNA-seq analysis with Scanpy: QC, normalization, PCA/UMAP, clustering, differential expression and plots, with ready-to-run pipeline scripts and guidance on converting Seurat and other R objects to h5ad. Needs Python 3.12+; by K-Dense.
- [Statistical Analysis](https://hebbmind.com/skill/statistical-analysis.md): [Skill] Guides agents to the right statistical method for research data: t-tests, ANOVA, chi-square, regression and Bayesian analysis, checking assumptions, computing effect sizes and power, and reporting results in APA format. Python-based (pingouin, statsmodels); by K-Dense.
- [Chrome DevTools](https://hebbmind.com/skill/chrome-devtools.md): [Skill] Teaches agents to use the Chrome DevTools MCP efficiently: snapshot first to get element uids, screenshot only when needed, paginate and filter large output, inspect CSS and test browser extensions. Needs chrome-devtools-mcp configured; maintained by the Chrome DevTools team.
- [Open Code Review](https://hebbmind.com/skill/open-code-review.md): [Skill] Drives Alibaba's open-source ocr CLI to review Git changes (working tree, a commit or a branch diff), grouping line-level comments by severity and fixing them on request. Needs an LLM endpoint (Anthropic, OpenAI and other protocols); installs the CLI if missing. By Alibaba.
- [agent-browser](https://hebbmind.com/skill/agent-browser.md): [Skill] Companion skill for the agent-browser CLI: has the agent load usage matching the installed version to navigate, fill forms, take screenshots and run exploratory tests, and can also drive Electron desktop apps. Install the agent-browser CLI first; from Vercel Labs.
- [team-composition-analysis](https://hebbmind.com/skill/team-composition-analysis.md): [Skill] Plans teams for seed to Series A startups: which roles to hire at each stage and in what order, org structure, plus salary, equity ranges and headcount budget. Compensation benchmarks are 2024 US market data; adjust for your market and have finance and legal review the plan.
- [clean-data-xls](https://hebbmind.com/skill/clean-data-xls.md): [Skill] Official Anthropic skill for cleaning messy Excel exports: trims spaces, standardizes case and dates, converts text numbers, dedupes, and flags mixed types, garbled text and errors. Keeps originals via helper-column formulas and confirms each step. Works in Claude for Excel; local files need Python.
- [merger-model](https://hebbmind.com/skill/merger-model.md): [Skill] Builds M&A accretion/dilution models: sources and uses, pro forma EPS and goodwill amortization impact, with sensitivities on synergies, premium and cash/stock mix, in an Excel workbook. You supply share prices, EPS and deal terms. From Anthropic's investment-banking plugin; needs expert review.
- [gl-recon](https://hebbmind.com/skill/gl-recon.md): [Skill] Official Anthropic fund admin skill: matches general ledger and subledger exports for a date or period line by line, lists mismatched amounts, quantities, posting dates and one-sided entries, suggests causes such as timing, FX or mapping, and writes a break report. Needs accountant review.
- [3-statement-model](https://hebbmind.com/skill/3-statement-model.md): [Skill] Completes and populates three-statement financial model templates, linking the income statement, balance sheet and cash flow with formulas and checking that the balance sheet balances and cash ties out, with no hardcoded values. Part of Anthropic's official financial-analysis plugin.
- [Claude for Financial Services](https://hebbmind.com/skill/financial-services.md): [Skill] Anthropic's official financial services skills for investment banking, equity research, private equity, fund admin and wealth management: comps, DCF, LBO, three-statement models, CIMs, earnings reviews, IC memos, GL reconciliation and more. Outputs need expert review.
- [comps-analysis](https://hebbmind.com/skill/comps-analysis.md): [Skill] Official Anthropic comparable company analysis skill: selects listed peers, compiles operating metrics and multiples like EV/EBITDA and P/E with percentiles, and outputs a comps table in Excel for valuation, IPO or financing pricing. Prefers paid sources like FactSet but can use SEC filings.
- [audit-xls](https://hebbmind.com/skill/audit-xls.md): [Skill] Official Anthropic finance skill that checks Excel for formula errors like #REF!, numbers hardcoded in formulas, sum ranges that miss rows and mixed units; on full models it also checks the balance sheet balances and cash ties. Lists issues and fixes and asks before changing anything.
- [dcf-model](https://hebbmind.com/skill/dcf-model.md): [Skill] Builds a DCF valuation in Excel: pulls figures from SEC filings and research, projects free cash flow, computes WACC and terminal value, and adds sensitivity tables. Derived values are formulas, inputs cite sources, and each step is confirmed with you. From Anthropic's financial-analysis plugin.
- [accrual-schedule](https://hebbmind.com/skill/accrual-schedule.md): [Skill] Builds the month-end accrual schedule: calculates each accrual for the period under company policy, notes the basis and drafts journal entries; drafts only, never posts, for controller review. A skill in Anthropic's official fund-admin plugin; supply your accrual policy list and GL data.
- [lbo-model](https://hebbmind.com/skill/lbo-model.md): [Skill] Official Anthropic LBO modeling skill: builds sources and uses, operating projections, debt schedule and IRR/MOIC returns in an Excel template, with every calculation as a formula and each section checked with you. Works in the Excel add-in or generates files with local Python; needs expert review.
- [Find Skills](https://hebbmind.com/skill/find-skills.md): [Skill] When a user asks whether a skill exists for some task, searches the skills.sh ecosystem with the skills CLI, then recommends and installs a fit. Maintained by Vercel Labs and shipped in the skills CLI repo.
- [Web Design Guidelines](https://hebbmind.com/skill/web-design-guidelines.md): [Skill] Reviews UI code against Vercel's Web Interface Guidelines, covering accessibility, focus, forms, animation, typography, dark mode and more, listing issues as file:line. Fetches the latest rules before each review. Maintained by Vercel.
- [Performance Report](https://hebbmind.com/skill/performance-report.md): [Skill] Turns campaign or channel data into weekly, monthly or quarterly marketing reports: executive summary, key metrics and period-over-period trends, wins and misses, and next-period priorities. Connect analytics tools or just paste tables or key numbers. From Anthropic's knowledge-work-plugins.
- [SOX Compliance Testing](https://hebbmind.com/skill/sox-testing.md): [Skill] For internal auditors running SOX tests: lists key controls by area (revenue, procure-to-pay, payroll, close, ITGC) and period, sets sample sizes, samples from your population, and generates test workpaper templates and deficiency assessments. Needs professional review. Official from Anthropic.
- [Month End Prep](https://hebbmind.com/skill/month-end-prep.md): [Skill] Month-end reconciliation for small businesses: matches QuickBooks or Xero line by line against PayPal, Stripe and Shopify payouts, flags likely duplicates and missing receipts, explains the P&L in plain terms and exports a close package (Excel and PDF). CSVs work too. Official from Anthropic.
- [people-report](https://hebbmind.com/skill/people-report.md): [Skill] Generates people analytics reports from employee data: headcount snapshots, voluntary and involuntary attrition, diversity metrics, spans of control and flight risk, with findings and recommendations for leadership. Needs an uploaded employee CSV or a connected HRIS. Official from Anthropic.
- [Cash Flow Snapshot](https://hebbmind.com/skill/cash-flow-snapshot.md): [Skill] 30/60/90-day cash flow forecasts for small businesses: reads receivables, payables and collections from your accounting system, PayPal or Stripe (or an uploaded CSV), gives a forecast with ranges and risk flags, and exports to Excel. Have an accountant review. Official from Anthropic.
- [tax-season-organizer](https://hebbmind.com/skill/tax-season-organizer.md): [Skill] Tax prep for US small business owners: estimates quarterly taxes from QuickBooks, Xero or an uploaded P&L, and at year end lists contractors paid over $600 for 1099-NEC, flagging missing W-9s, for your accountant. US federal only; books must be closed. Not tax advice. From Anthropic.
- [reconciliation](https://hebbmind.com/skill/reconciliation.md): [Skill] Account reconciliation following accounting methodology: GL to subledger, bank reconciliations and intercompany balances, with reconciling items categorized, aged and escalated. Part of Anthropic's official finance plugin; results need professional review.
- [Inventory Planner](https://hebbmind.com/skill/inventory-planner.md): [Skill] Reorder planning for small merchants: reads sales and stock from Shopify, Square, NetSuite or CSV, projects stockout dates from 7- and 28-day velocity, sizes reorders from 60-day usage plus lead time, drafts POs and supplier emails, and flags dead stock. Nothing is sent unapproved. By Anthropic.
- [Invoice Chase](https://hebbmind.com/skill/invoice-chase.md): [Skill] Helps small business owners collect overdue payments: finds overdue invoices in QuickBooks, Xero, PayPal or Stripe and drafts reminder emails with a tone suited to each customer's payment history, sent only after your approval. Without a connection, upload an AR aging CSV. By Anthropic.
- [variance-analysis](https://hebbmind.com/skill/variance-analysis.md): [Skill] Breaks budget-versus-actual, year-over-year and month-over-month variances into volume, price and mix drivers, filters by materiality thresholds, writes variance commentary and provides waterfall breakdowns for monthly business reviews. From Anthropic's official finance plugin.
- [AP Processor](https://hebbmind.com/skill/ap-processor.md): [Skill] Anthropic's official small-business skill for bills: reads vendor, amount and due date from email, PDFs or photos, dedupes, codes to accounts, matches POs and drafts a payment plan. Posting and paying each need approval; it never auto-pays. Works with QuickBooks, Xero, NetSuite or file export.
- [SQL Queries](https://hebbmind.com/skill/sql-queries.md): [Skill] Anthropic's official data skill that guides agents to write, translate and optimize SQL across Snowflake, BigQuery, Databricks, PostgreSQL and other warehouse dialects, including CTEs, window functions and analytical aggregations.
- [Payroll Prep](https://hebbmind.com/skill/payroll-prep.md): [Skill] Checks hours before payroll for US small businesses: totals regular time, overtime and PTO from Gusto, QuickBooks Payroll or timesheets, and flags missed punches, overtime anomalies, rate changes and mid-period hires or exits. Prepares only, never runs payroll. Official from Anthropic.
- [comp-analysis](https://hebbmind.com/skill/comp-analysis.md): [Skill] Compensation analysis for HR and managers: market pay percentiles by role, level and location, offer competitiveness checks and equity modeling; upload a pay sheet to find employees outside their band and flight risks. Without a comp data source it uses public web data, so verify. By Anthropic.
- [Journal Entry Preparation](https://hebbmind.com/skill/journal-entry-prep.md): [Skill] Helps accountants prepare month-end journal entries: debit/credit treatment for accruals, prepaid amortization, depreciation, payroll and revenue recognition, plus required support and review checklists, following US GAAP. Not financial advice; review before posting. From Anthropic's finance plugin.

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