A build setup for Nim projects using Xmake, a tool that turns source files into programs or libraries. It supports Nim’s C, C++, Objective-C and JavaScript output backends, including projects that mix Nim with C.

Use it to build Nim executables or libraries, select a backend, pass Nim or C compiler options, and combine Nim code with C code.

It provides one target-based build configuration while letting you choose how Nim generates the underlying code. This avoids managing separate build commands for each target type.

xmake-nim — Skill for Claude Code by xmake-io

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add xmake-io/xmake-skills --skill xmake-nim

Clone the repo

git clone --depth 1 https://github.com/xmake-io/xmake-skills

Made for: Claude Code.

Or install xmake-skills, the plugin that ships this one along with the rest of its 58 skills.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/xmake-io/xmake-skills/xmake-nim/github.svg)](https://agentmods.dev/skills/xmake-io/xmake-skills/xmake-nim)

Your own site

<a href="https://agentmods.dev/skills/xmake-io/xmake-skills/xmake-nim"><img src="https://agentmods.dev/badge/skills/xmake-io/xmake-skills/xmake-nim/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/xmake-io/xmake-skills/xmake-nim"><img src="https://agentmods.dev/badge/skills/xmake-io/xmake-skills/xmake-nim.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 40 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 643 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits

NVIDIA SkillSpector pass 7 Sept 2026

How audits are shown

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00040	$0.00643
Opus 5	$0.00020	$0.00321
Sonnet 5	$0.00008	$0.00129
Haiku 4.5	$0.00004	$0.00064

Measured 12d ago against content hash 53135b981bd3, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

xmake-nim scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/languages/xmake-nim/SKILL.md · 87 lines

How it starts

The opening of the file, as written. The whole thing — 87 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Building Nim with Xmake

Nim compiles to C (or C++ / JavaScript) via nim c / nim cpp; xmake wraps this into a regular target model.

1. Minimal project

xmake create -l nim -t console hello
cd hello
xmake run

add_rules("mode.debug", "mode.release")

target("hello")
    set_kind("binary")
    add_files("src/*.nim")

2. Target kinds

target("app")       set_kind("binary")
target("mylib")     set_kind("static")
target("mydyn")     set_kind("shared")

3. Backend selection

target("app")
    add_files("src/main.nim")
    set_values("nim.backend", "c")         -- default
    -- or:
    set_values("nim.backend", "cpp")
    set_values("nim.backend", "objc")
    set_values("nim.backend", "js")

Most projects use c (native). cpp is required if you import C++ libraries via {.importcpp.}. js is for web targets.

4. Flags

target("app")
    add_files("src/*.nim")
    add_ncflags("-d:release", "--opt:speed")           -- Nim compiler flags
    add_cxflags("-O3")                                 -- passes to underlying C compiler

add_ncflags = Nim compiler flags. add_cxflags flows through to the C backend.

5. Toolchain

xmake f --toolchain=nim
xmake f --toolchain=nim --sdk=/opt/nim-2.0

6. Mixing Nim with C

Nim code can call C with {.importc.}; xmake can also compile C files alongside:

target("app")
    set_kind("binary")
    add_files("src/main.nim", "src/helper.c")
    add_includedirs("include")

Pitfalls

Backend mismatch. If Nim code uses {.importcpp.}, the target must use nim.backend = "cpp". Otherwise link errors.
nimble vs xmake. Nim's native package manager is nimble. Xmake doesn't integrate with it — declare Nim deps via nimble manually, and let xmake handle the build.
-d:release passed as nim flag. It's a Nim define, not a C flag — must go in add_ncflags, not add_defines.

When to branch out

Target basics → xmake-targets
Mixing with C/C++ → xmake-targets

Read the full file on GitHub · 87 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

12d ago First seen · 87 lines · 40 tokens per session scan A 53135b981bd3

Subscribe to this mod's changes

xmake-nim is a skill published in the GitHub repository xmake-io/xmake-skills (24 stars, last pushed 19d ago), licensed Apache-2.0. It adds 40 tokens to every session and 643 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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Guide for writing ast-grep rules to perform structural code search and analysis. Use when users need to search codebases using Abstract Syntax Tree (AST) patterns, find specific code structures, or perform complex code queries that go beyond simple text search. This skill should be used when users ask to search for…

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xmake-nim