Security Patterns
CloudAI-X/claude-workflow-v2
Implements authentication, authorization, encryption, secrets management, and security hardening patterns.
Apply security best practices for Fondo including OAuth token management, financial data protection, SOC 2 compliance, and access control.
Install Fondo Security Basics
$ npx skills add jeremylongshore/tons-of-skills-marketplace --skill fondo-security-basics -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install jeremylongshore/tons-of-skills-marketplace fondo-security-basics --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/jeremylongshore/tons-of-skills-marketplace.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/.curated/fondo-security-basics .claude/skills/fondo-security-basics && rm -rf skills-srcUse ~/.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/
Install the "fondo-security-basics" agent skill from https://github.com/jeremylongshore/tons-of-skills-marketplace/tree/main/skills/.curated/fondo-security-basics into .claude/skills/fondo-security-basics/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "fondo-security-basics", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/jeremylongshore/tons-of-skills-marketplace/tree/main/skills/.curated/fondo-security-basicsType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add jeremylongshore/tons-of-skills-marketplace --skill fondo-security-basics -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install jeremylongshore/tons-of-skills-marketplace fondo-security-basics --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/jeremylongshore/tons-of-skills-marketplace.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/.curated/fondo-security-basics .agents/skills/fondo-security-basics && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "fondo-security-basics" agent skill from https://github.com/jeremylongshore/tons-of-skills-marketplace/tree/main/skills/.curated/fondo-security-basics into .agents/skills/fondo-security-basics/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "fondo-security-basics", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add jeremylongshore/tons-of-skills-marketplace --skill fondo-security-basics -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install jeremylongshore/tons-of-skills-marketplace fondo-security-basics --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/jeremylongshore/tons-of-skills-marketplace.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/.curated/fondo-security-basics .cursor/skills/fondo-security-basics && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "fondo-security-basics" agent skill from https://github.com/jeremylongshore/tons-of-skills-marketplace/tree/main/skills/.curated/fondo-security-basics into .cursor/skills/fondo-security-basics/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "fondo-security-basics", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/jeremylongshore/tons-of-skills-marketplace.git --path skills/.curated/fondo-security-basics--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add jeremylongshore/tons-of-skills-marketplace --skill fondo-security-basics -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install jeremylongshore/tons-of-skills-marketplace fondo-security-basics --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/jeremylongshore/tons-of-skills-marketplace.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/.curated/fondo-security-basics .gemini/skills/fondo-security-basics && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "fondo-security-basics" agent skill from https://github.com/jeremylongshore/tons-of-skills-marketplace/tree/main/skills/.curated/fondo-security-basics into .gemini/skills/fondo-security-basics/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "fondo-security-basics", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install jeremylongshore/tons-of-skills-marketplace fondo-security-basicsInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add jeremylongshore/tons-of-skills-marketplace --skill fondo-security-basics -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/jeremylongshore/tons-of-skills-marketplace.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/.curated/fondo-security-basics .github/skills/fondo-security-basics && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "fondo-security-basics" agent skill from https://github.com/jeremylongshore/tons-of-skills-marketplace/tree/main/skills/.curated/fondo-security-basics into .github/skills/fondo-security-basics/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "fondo-security-basics", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add jeremylongshore/tons-of-skills-marketplace --skill fondo-security-basics -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install jeremylongshore/tons-of-skills-marketplace fondo-security-basics --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/jeremylongshore/tons-of-skills-marketplace.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/.curated/fondo-security-basics .opencode/skills/fondo-security-basics && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "fondo-security-basics" agent skill from https://github.com/jeremylongshore/tons-of-skills-marketplace/tree/main/skills/.curated/fondo-security-basics into .opencode/skills/fondo-security-basics/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "fondo-security-basics", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
fondo-security-basics- GitHub stars
- 2.8k
- Token cost
- ~1.2k tokens
- SKILL.md length
- 300 words
- Files
- 1
- Skills in repo
- 3,342
- Repo updated
- First seen
- Licence
- MIT
At a glance
Apply security best practices for Fondo including OAuth token management, financial data protection, SOC 2 compliance, and access control.
- Tasks that involve Authorization and RBAC
- SKILL.md covers Prerequisites, Instructions, Output and Examples, plus 9 more sections
- Reaches api.fondo.com; needs FONDO_API_KEY and FONDO_WEBHOOK_SECRET
- Tasks that involve Privacy and GDPR
What it does
Fondo Security Basics is an agent skill from jeremylongshore/tons-of-skills-marketplace. Apply security best practices for Fondo including OAuth token management, financial data protection, SOC 2 compliance, and access control. Trigger: "fondo security", "fondo data protection", "fondo SOC 2", "fondo access control".
Its SKILL.md is about 1.2k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts. Compatibility notes: Designed for Claude Code
It sits in Backend & APIs, covering Authorization and RBAC, Privacy and GDPR and SOC 2 and security compliance. The repository describes itself as: Model-agnostic agent-skills platform with a harness-free canonical layer, verified adapters, and the ccpi package manager. Explore at tonsofskills.com. The licence is MIT.
When your agent uses it
- Tasks that involve Authorization and RBAC
- Tasks that involve Privacy and GDPR
- Tasks that involve SOC 2 and security compliance
Example prompts
- “fondo security”
- “fondo data protection”
- “fondo SOC 2”
- “/fondo-security-basics”
Requirements
- A credential in FONDO_API_KEY
- A credential in FONDO_WEBHOOK_SECRET
- Compatibility (from SKILL.md): Designed for Claude Code
- Pre-approved tools (allowed-tools): Read, Write, Grep
What it can do on your machine
Read from SKILL.md and the folder at commit cfae287. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves these tools, so the agent can use them without asking each time:
ReadWriteGrep
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 typescript).
From the folder's file list and the shell code blocks in SKILL.md.
Network
Hosts in commands or code, which the agent is likely to contact:
api.fondo.com
Also links to:
fondo.comowasp.org
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names these keys or tokens, usually read from environment variables:
FONDO_API_KEYFONDO_WEBHOOK_SECRET
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Compatibility
Designed for Claude Code
From compatibility in the SKILL.md frontmatter.
Context cost
Fondo Security Basics loads about 1.2k tokens when it runs. Until then it costs about 63 tokens; SKILL.md has 300 words of instructions outside code blocks.
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 jeremylongshore/tons-of-skills-marketplace at commit cfae287, republished under its MIT licence (© jeremylongshore). 300 words, ~1,214 tokens.
Download SKILL.mdSave it as
.claude/skills/fondo-security-basics/SKILL.md (or your agent's skills folder).- name
- fondo-security-basics
- description
- Apply security best practices for Fondo including OAuth token management, financial data protection, SOC 2 compliance, and access control. Trigger: "fondo security", "fondo data protection", "fondo SOC 2", "fondo access control".
- allowed-tools
- Read, Write, Grep
- compatibility
- Designed for Claude Code
- version
- 1.6.0
- license
- MIT
- author
- Jeremy Longshore <jeremy@intentsolutions.io>
- tags
- saas, accounting, fondo
Fondo Security Basics
Prerequisites
A security owner, scoped secret manager, financial-data access policy, review cadence, and synthetic fixtures.
Instructions
Use least-privilege credentials per environment; verify signed events and idempotency; restrict financial and tax data to approved systems; redact diagnostics; rotate credentials on suspected exposure.
Output
Maintain a security receipt with scope, secret reference, access-review date, control result, owner, and redacted incident state. Do not include financial data or secrets.
Examples
Verify a fictional signed event is processed once, an invalid signature is rejected without payload logging, and revoking a staging credential blocks future requests.
Overview
Fondo handles startup tax preparation, bookkeeping, and R&D tax credits containing SSNs, EINs, bank account details, revenue figures, and complete tax returns. A breach exposes founder personal tax data, company financials, and IRS filing details. Protect OAuth connections to banking/payroll systems, exported financial documents, and team access controls with the same rigor as a CPA firm.
API Key Management
function createFondoClient(): { apiKey: string; baseUrl: string } {
const apiKey = process.env.FONDO_API_KEY;
if (!apiKey) {
throw new Error("Missing FONDO_API_KEY — store in secrets manager, never in code");
}
// Fondo keys access tax returns and SSN/EIN data — treat as highest sensitivity
console.log("Fondo client initialized (key suffix:", apiKey.slice(-4), ")");
return { apiKey, baseUrl: "https://api.fondo.com/v1" };
}Webhook Signature Verification
import crypto from "crypto";
import { Request, Response, NextFunction } from "express";
function verifyFondoWebhook(req: Request, res: Response, next: NextFunction): void {
const signature = req.headers["x-fondo-signature"] as string;
const secret = process.env.FONDO_WEBHOOK_SECRET!;
const expected = crypto.createHmac("sha256", secret).update(req.body).digest("hex");
if (!signature || !crypto.timingSafeEqual(Buffer.from(signature), Buffer.from(expected))) {
res.status(401).send("Invalid signature");
return;
}
next();
}Input Validation
import { z } from "zod";
const TaxFilingSchema = z.object({
entity_id: z.string().uuid(),
tax_year: z.number().int().min(2015).max(2030),
filing_type: z.enum(["1120", "1120S", "1065", "941", "R&D_credit"]),
ein: z.string().regex(/^\d{2}-\d{7}$/),
revenue: z.number().nonnegative(),
status: z.enum(["draft", "review", "filed", "amended"]),
});
function validateTaxFiling(data: unknown) {
return TaxFilingSchema.parse(data);
}Data Protection
const FONDO_PII_FIELDS = ["ssn", "ein", "bank_account", "routing_number", "tax_return_url", "revenue", "salary"];
function redactFondoLog(record: Record<string, unknown>): Record<string, unknown> {
const redacted = { ...record };
for (const field of FONDO_PII_FIELDS) {
if (field in redacted) redacted[field] = "[REDACTED]";
}
return redacted;
}Security Checklist
- API keys stored in secrets manager, never in code
- OAuth connections (Gusto, QuickBooks, Plaid, Stripe) reviewed quarterly
- Financial exports never committed to git (
.gitignoreenforced) - SSN and EIN values never logged in plaintext
- Team roles follow least-privilege (Owner/Admin/Viewer/CPA)
- Two-factor authentication enabled on Fondo account
- Exported tax documents encrypted with GPG before storage
- Bank connections use Plaid (encrypted, not screen-scraping)
Error Handling
| Vulnerability | Risk | Mitigation |
|---|---|---|
| Leaked API key | Full access to tax returns and SSN/EIN data | Secrets manager + rotation |
| Unencrypted financial exports | Tax data exposed via CSV on disk | GPG encryption + secure deletion |
| Stale OAuth tokens | Compromised banking/payroll connections | Quarterly OAuth review + revocation |
| Overly broad team access | Viewer sees SSN/salary data | Role-based access control enforcement |
| Tax data in application logs | IRS compliance violation | Field-level PII redaction |
Resources
Next Steps
See fondo-prod-checklist.
© jeremylongshore, MIT. 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 skills/.curated/fondo-security-basics of jeremylongshore/tons-of-skills-marketplace.
Open the folder on GitHubat commit cfae287
Compare with similar skills
Fondo Security Basics 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.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Fondo Security Basics this skilljeremylongshore/tons-of-skills-marketplace | 2.8k | — | ~1.2k | Automated safety check: Pass | MIT | |
| Security PatternsCloudAI-X/claude-workflow-v2 | 1.4k | — | ~3.6k | Automated safety check: Notes | MIT | |
| Security Auditoraiskillstore/marketplace | 433 | 6 repos | ~2.6k | Automated safety check: Pass | None | |
| Cis ControlsSushegaad/Claude-Skills-Governance-Risk-and-Compliance | 946 | 1 repos | ~4.2k | Automated safety check: Pass | MIT | |
| Policy OpaAgentSecOps/SecOpsAgentKit | 220 | 1 repos | ~3.5k | Automated safety check: Pass | Custom licence | |
| Nist Pf Protectmukul975/Privacy-Data-Protection-Skills | 301 | — | ~2.6k | Automated safety check: Pass | Apache-2.0 |
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Related
Categories
Questions about Fondo Security Basics
What does Fondo Security Basics do?
Apply security best practices for Fondo including OAuth token management, financial data protection, SOC 2 compliance, and access control. Fondo Security Basics is an agent skill from jeremylongshore/tons-of-skills-marketplace. Apply security best practices for Fondo including OAuth token management, financial data protection, SOC 2 compliance, and access control.
When should I use Fondo Security Basics?
Fondo Security Basics fits situations like: tasks that involve Authorization and RBAC; tasks that involve Privacy and GDPR; tasks that involve SOC 2 and security compliance.
How do I install Fondo Security Basics in Claude Code?
Run `npx skills add jeremylongshore/tons-of-skills-marketplace --skill fondo-security-basics -a claude-code`. Or copy the skill folder (skills/.curated/fondo-security-basics in jeremylongshore/tons-of-skills-marketplace) into .claude/skills/fondo-security-basics in your project. Claude Code loads it when a task matches its description.
How do I install Fondo Security Basics in Codex?
Run `npx skills add jeremylongshore/tons-of-skills-marketplace --skill fondo-security-basics -a codex`. Or copy the skill folder (skills/.curated/fondo-security-basics in jeremylongshore/tons-of-skills-marketplace) into .agents/skills/fondo-security-basics in your project. Codex loads it when a task matches its description.
Can I use Fondo Security Basics 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 jeremylongshore/tons-of-skills-marketplace --skill fondo-security-basics -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/fondo-security-basics, .gemini/skills/fondo-security-basics, .github/skills/fondo-security-basics and .opencode/skills/fondo-security-basics in your project.
What does Fondo Security Basics need to run?
Going by SKILL.md and its folder, Fondo Security Basics needs credentials named FONDO_API_KEY and FONDO_WEBHOOK_SECRET. Our summary lists: A credential in FONDO_API_KEY; A credential in FONDO_WEBHOOK_SECRET. Its frontmatter pre-approves these tools: Read, Write, Grep. Compatibility (from SKILL.md): Designed for Claude Code.
Does Fondo Security Basics access the network?
SKILL.md names 3 domains. In commands or code: api.fondo.com; the agent is likely to contact it when it follows the instructions. As links in the text: fondo.com and owasp.org. This is read from the text; nothing was executed.
Is Fondo Security Basics 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 Fondo Security Basics use?
Fondo Security Basics is published under the MIT licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Fondo Security Basics use?
About 1.2k tokens (SKILL.md is roughly 4.9k 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 Fondo Security Basics?
Skills that share tags, products or a category with Fondo Security Basics: Security Patterns (CloudAI-X/claude-workflow-v2, 1.4k stars), Security Auditor (aiskillstore/marketplace, 433 stars), Cis Controls (Sushegaad/Claude-Skills-Governance-Risk-and-Compliance, 946 stars) and Policy Opa (AgentSecOps/SecOpsAgentKit, 220 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Fondo Security Basics?
jeremylongshore (a GitHub user) maintains it in jeremylongshore/tons-of-skills-marketplace, which has 2,827 GitHub stars. The repository holds 3,342 skills in this directory. The repository was last updated on October 10, 2026.
Source: jeremylongshore/tons-of-skills-marketplace on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.