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Issue title

Code quality scan: 29 findings (B+, 79/100)

Issue body (markdown)

Hi @apple, an automated scan of this repository surfaced **29 code-quality findings** that may be worth a look. 
Full details, severity filters, and per-file context are at the link below — feel free to close this issue if it isn't useful to you.

## Full interactive report

**https://repobility.com/scan/baea6949-a961-48bf-bcc4-2305c5c280b9/**

![Live scan page](https://repobility.com/scan/baea6949-a961-48bf-bcc4-2305c5c280b9/report.png?v=1778935802)

## At a glance

- **Score**: `79/100`  •  **Grade**: `B+`
- **Scanned**: `2026-05-16 12:50 UTC`
- **Lines of code**: 294,801
- **Total findings**: 29
- **Security-tagged**: 0
- **Credential / secret patterns**: 0

## Top issues, with file & line

_These are deterministic rule-based findings — the file paths and line numbers below are real and can be verified in your tree._

1. **[high]** [SEC029] Server-Side Request Forgery (SSRF) — outbound HTTP from user input: Outbound HTTP request to a user-controlled URL without allowlist validation. Attackers can probe internal services (169.254.169.254 metadata, internal Kubernetes endpoints, file:// URIs), exfiltrate data, or pivot through your network. SSRF is OWASP A10:2021 and a frequent foothold in cloud breaches. — `Examples/Sources/AddOneToIntegerLiterals/AddOneToIntegerLiterals.swift:58`
   _Validate the URL against an allowlist BEFORE fetching:   ALLOWED = {'images.example.com', 'cdn.example.com'}   host = urlparse(url).hostname   if host not in ALLOWED: abort(400)…_
2. **[high]** [SEC029] Server-Side Request Forgery (SSRF) — outbound HTTP from user input: Outbound HTTP request to a user-controlled URL without allowlist validation. Attackers can probe internal services (169.254.169.254 metadata, internal Kubernetes endpoints, file:// URIs), exfiltrate data, or pivot through your network. SSRF is OWASP A10:2021 and a frequent foothold in cloud breaches. — `Examples/Sources/MacroExamples/Implementation/Expression/URLMacro.swift:32`
   _Validate the URL against an allowlist BEFORE fetching:   ALLOWED = {'images.example.com', 'cdn.example.com'}   host = urlparse(url).hostname   if host not in ALLOWED: abort(400)…_
3. **[high]** [SEC029] Server-Side Request Forgery (SSRF) — outbound HTTP from user input: Outbound HTTP request to a user-controlled URL without allowlist validation. Attackers can probe internal services (169.254.169.254 metadata, internal Kubernetes endpoints, file:// URIs), exfiltrate data, or pivot through your network. SSRF is OWASP A10:2021 and a frequent foothold in cloud breaches. — `Examples/Sources/MacroExamples/Interface/ExpressionMacros.swift:57`
   _Validate the URL against an allowlist BEFORE fetching:   ALLOWED = {'images.example.com', 'cdn.example.com'}   host = urlparse(url).hostname   if host not in ALLOWED: abort(400)…_
4. **[low]** Duplicated implementation block across source files — `Sources/SwiftSyntax/Documentation.docc/Resources/Formatter.step2.swift:2`
   _Duplicated blocks are a common artifact when generated code is pasted or recreated instead of reused. They increase maintenance cost because every future bug fix must be found i…_
5. **[low]** Duplicated implementation block across source files — `Sources/SwiftSyntax/Documentation.docc/Resources/Formatter.step11.swift:1`
   _Duplicated blocks are a common artifact when generated code is pasted or recreated instead of reused. They increase maintenance cost because every future bug fix must be found i…_

See all 29 findings, with severity filters and AI fix prompts: **https://repobility.com/scan/baea6949-a961-48bf-bcc4-2305c5c280b9/**

---

**What is this?** [Repobility](https://repobility.com) is a research project that scans public repositories with a multi-layer static analyzer (rule-based, no AI hallucinations) and learns code-quality patterns across a broad cross-repo corpus. This is **not a sales pitch** — there's no paywall, no signup required to view the report, and no payment ask. If the findings aren't useful, please close this issue and we won't post again.

**To re-run after fixes land:** paste your repo URL at [repobility.com](https://repobility.com) — fresh scan, free.

_Issue filed via the public Repobility report at https://repobility.com/scan/baea6949-a961-48bf-bcc4-2305c5c280b9/._
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