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Guides adoption and use of the C -fbounds-safety language extension, including pointer annotations, compiler settings, and runtime debugging of bounds violations.
How this skill is triggered — by the user, by Claude, or both
Slash command
/xcode-skills:c-bounds-safetyWhen to use
When working with, reading, reviewing, comparing, debugging or analyzing C code that has adopted -fbounds-safety or wants to adopt it. Key syntax to look for Bounds annotations (__counted_by, __counted_by_or_null, __sized_by, __sized_by_or_null, __ended_by, __single, __indexable, __bidi_indexable, __unsafe_indexable, __null_terminated, __terminated_by), its helper functions (e.g.: __unsafe_forge_bidi_indexable, __unsafe_forge_single, __null_terminated_to_indexable, __unsafe_null_terminated_to_indexable, __unsafe_null_terminated_from_indexable) or other macros (e.g. __ptrcheck_abi_assume_single) or includes of "ptrcheck.h".
The summary Claude sees in its skill listing — used to decide when to auto-load this skill
When helping with `-fbounds-safety` adoption or code changes, ask clarifying questions about the user's codebase and goals before suggesting changes. For complex tasks involving multiple files or non-trivial annotation decisions, use plan mode to propose an approach before implementing.
When helping with -fbounds-safety adoption or code changes, ask clarifying questions about the user's codebase and goals before suggesting changes. For complex tasks involving multiple files or non-trivial annotation decisions, use plan mode to propose an approach before implementing.
-fbounds-safety Language Extension-fbounds-safety is a C language extension that prevents out-of-bounds memory access by enforcing bounds safety at the language level. It inserts automatic bounds checks at runtime, rejects unsafe pointer operations at compile time, and requires programmers to provide bounds annotations so the compiler can guarantee safety. Out-of-bounds accesses become deterministic traps instead of exploitable vulnerabilities.
You MUST have fully read the following three documents (via the Read tool) at the start of an adoption task, and re-read them via the Read tool before any source-modifying step in the adoption workflow unless their content is verifiably fresh in your active context:
-fbounds-safety in an existing C project (full and header-only modes).-fbounds-safety: pointer kinds, annotations, and the rules that govern them.For compiler flags, Xcode build settings, soft trap mode, and ptrcheck.h configuration, read build-settings.md.
For debugging bounds violations at runtime — trap behavior, LLDB commands, wide pointer inspection, watchpoints, crash log analysis, and soft trap debugging, read runtime-debugging.md.
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