format-string SKILL.md skillA
format-string from dannyan/secguard-clang is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add dannyan/secguard-clang/format-string@git:20261019.3855413Pins git:20261019.3855413 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- dannyan/secguard-clang
- Path
extension/shared/skills/format-string/SKILL.md- Versions recorded
- 5
- Latest version
- git:20261019.3855413, committed Oct 19, 2026
- First version recorded
- Sep 14, 2026
- Size
- 4,548 bytes
- Repository stars
- 25
- License
- Apache-2.0
Classify format string vulnerability evidence — printf-family called with non-literal format argument. Maps to CWE-134.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
## Format String Vulnerability Analysis (CWE-134) ### Evidence Pattern A format-string candidate has: - **format_string**: A printf-family function is called where the format argument is not a string literal - **api**: the format function called - **format_arg**: the non-literal format argument expression - **taint_source**: where the user-controlled value behind the format argument originates (when the taint filter proved one) - **callsite_census** (when the format argument is a function parameter): the in-tree call-site argument census for that parameter — `all-literal` means every caller passes a compile-time constant - **call_path**: The function is reachable from an entry point ### Hint Tokens (Verdict Basis) | Token | Meaning | Your action | |-------|---------|-------------| | `fmt-arg@<expr>` | the format argument expression | a non-literal (variable) format is the CWE-134 signal; a function **parameter** is attacker-reachable only when `callsites@` shows a non-constant argument or no in-tree call site — **pair with `callsites@` before confirming**; a constant string literal → **dismissed**; a local that is never externally controlled → judge | …
Read the whole file at its exact version.
How to install
mdr add dannyan/secguard-clang/format-string@sha256:62ff6d0d57c9fb1fThe line at the top of this page pins the label git:20261019.3855413, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_jdyty7b27si2ftrl)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 5 versions of this file, between Sep 14, 2026 and Oct 19, 2026, about one every 9 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261019.3855413 latest | 2026-10-19 | 3855413 | 4,548 B | A | view · diff |
| git:20261018.bc5572f | 2026-10-18 | bc5572f | 3,361 B | A | view · diff |
| git:20261017.a78401f | 2026-10-17 | a78401f | 3,208 B | A | view · diff |
| git:20261016.df7fb32 | 2026-10-16 | df7fb32 | 2,829 B | A | view · diff |
| git:20260914.1ef9fbc | 2026-09-14 | 1ef9fbc | 2,605 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (4548 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
dannyan/secguard-clang · 25 stars · license Apache-2.0 · pushed 2026-10-22 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_jdyty7b27si2ftrl GET https://markdownregistry.com/api/v1/resolve?ref=dannyan/secguard-clang/format-string GET https://markdownregistry.com/api/v1/blob/62ff6d0d57c9fb1f3b4250499cb6a855bcb8fa02dff90fb2ca79a3dc6c8f2eb0
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.