swain.
swain. is Descry’s open-source, local-first security review tool that scans launch-risk surfaces and guides you to “fix first” issues before you ship—no accounts, no quota, no config.
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Product Information
Updated:Jun 1, 2026
What is swain.
swain. is an open-source applied AI infosec tool from descry built to make machine-written code “legible—and stoppable.” Designed as a one-command, local security review, it helps teams quickly scan a codebase for common, high-impact launch risks and then prioritizes what to remediate first. The project emphasizes local, private, deterministic runs, aiming to integrate easily into a developer’s workflow right before release.
Key Features of swain.
Swain is an open-source, local-first security review tool from descry designed to scan “launch-risk surfaces” in codebases—especially those increasingly written with AI assistance—so nothing the machine writes passes unseen. It runs locally and deterministically with a one-command workflow, producing actionable findings and a “fix first” prioritization view. Coverage focuses on common high-impact web/app security areas such as authentication/session handling, tokens/privilege boundaries, secrets, uploads, tenant isolation/object-level authorization, and common injection/XSS classes.
One-command local security scan: Run a security review quickly (e.g., demo mode) with no quota, no config, and no new accounts—optimized for fast pre-ship checks.
Local & deterministic analysis: Executes locally and aims for repeatable results, supporting privacy-sensitive environments and predictable CI-style workflows.
“Fix first” prioritization: Highlights higher-priority findings and points directly to affected files/areas so teams can remediate the most critical issues first.
Coverage of core web security risk areas: Targets common launch blockers including auth/sessions/tokens/privilege, billing/webhooks trust, uploads/path handling, secrets, SQL injection/parameterization, XSS/unsafe rendering, and tenant/object-level authorization.
Open-source infosec tooling (Apache-2.0): Available as an open-source project for inspection, self-hosting, and integration into internal security practices.
Use Cases of swain.
Pre-release security gate for SaaS/web apps: Scan a codebase before shipping to catch auth, tenant isolation, injection, XSS, and secrets issues that commonly lead to incidents.
AI-assisted development risk control: Teams using code-generation tools can run Swain to make machine-written code legible and stoppable by surfacing security flaws early.
CI-friendly security checks for engineering teams: Use deterministic local scans as a repeatable step in build/release workflows to prevent regressions in sensitive areas like sessions and tokens.
Security review for fintech billing and webhook flows: Apply scans to payment/billing integrations to identify trust boundary issues around webhooks and related backend endpoints.
Multi-tenant platform hardening: Validate object-level authorization and tenant boundary handling to reduce cross-tenant data exposure risk in B2B platforms.
Pros
Local-first and privacy-friendly (no new accounts, no quota, no config implied by demo workflow).
Focused on high-impact launch risks (auth, secrets, injection, XSS, tenant isolation, uploads, billing/webhooks).
Open-source (Apache-2.0), enabling transparency and internal customization.
Cons
Scope appears centered on web/app “launch-risk surfaces,” so it may not cover all security domains (e.g., full SAST/DAST breadth) based on the provided sources.
Effectiveness and depth of findings are not independently benchmarked in the provided sources.
How to Use swain.
1) Install swain locally: From the descry site, run the installer command shown: `curl -fsSL …/install.sh | sh` (use the exact URL from the site). This installs the `swain` CLI on your machine.
2) Verify the CLI is available: Open a new terminal session and confirm the command exists by running `swain` (or `swain --help`) to see available commands/options.
3) Run the no-quota demo scan: Execute `swain demo` to run a local, private demo that showcases findings without requiring accounts, configuration, or quotas.
4) Review the findings output: Read the CLI output that lists files and findings (example shown on the site: findings mapped to paths like `components/UserProfile.jsx`, `api/search.py`, `api/user.py`) along with severity (e.g., “medium”).
5) Use “fix first” to prioritize remediation: Follow the tool’s “fix first” guidance (as shown in the UI/flow on the site) to focus on the highest-priority issues first, starting with the specific file(s) it highlights.
6) Re-scan after changes: After applying fixes in your codebase, run swain again (e.g., re-run `swain demo` or your chosen scan command) to confirm findings are reduced or resolved.
7) Expand coverage areas you check for: Use swain to review the risk surfaces listed on the official page: auth (sessions/tokens/privilege), billing/payment trust & webhooks, uploads (path handling/tenant boundaries), secrets (hardcoded/env handling), SQL injection (parameterization), XSS (unsafe rendering/innerHTML), and tenant object-level authorization/isolation.
8) Use the open-source repo for deeper usage and integration: Open the GitHub repository linked on the official page (Descry-Technologies/Swain) to find the authoritative README, additional commands, configuration options, and recommended workflows for running swain on real projects.
swain. FAQs
swain. is an open-source security review tool from descry that scans “launch-risk surfaces” in code and highlights findings with “fix first” guidance.
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