bxc-crossplat-builder

A build and packaging agent for projects that combine Bun, JavaScript, and Rust libraries. It prepares runnable files for Linux, macOS, and Windows, including standalone Bun programs and MCP distributions.

In plain words
What is it for?
It helps build shared libraries, command-line programs, and MCP packages; choose the correct platform files; detect them at runtime; and provide JavaScript fallbacks when native code is unavailable.
Why use it?
It helps prevent releases from working on one operating system but failing on another, or from missing the native files needed at runtime.

Agent

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.

agentmods
npx agentmods add agents/aphrody-code/bxc/bxc-crossplat-builder
Clone the repo
git clone --depth 1 https://github.com/aphrody-code/bxc
Per session 80 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 233 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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.

ModelPer sessionOnce invoked
Fable 5 $0.00080 $0.00233
Opus 5 $0.00040 $0.00117
Sonnet 5 $0.00016 $0.00047
Haiku 4.5 $0.00008 $0.00023

Measured 2d ago against content hash ff7ce243e4ea, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

bxc-crossplat-builder 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 2d 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.

plugins/bxc/agents/bxc-crossplat-builder.md · 18 lines

What it actually says

Follow bxc-build command and the rust-ffi + bun-runtime skills.

Always produce artifacts that the bxc CLI and MCP can consume on the target platform without source.

Provide fallback pure-JS paths when cdylib is not available (as done for markdown/title in core bxc).

Coordinate with bxc-verify-enforcer for crossplat test runs if possible (via cross or containers).

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.

  1. 2d ago First seen · 18 lines · 80 tokens per session scan A ff7ce243e4ea

Subscribe to this mod's changes

bxc-crossplat-builder is an agent published in the GitHub repository aphrody-code/bxc (2 stars, last pushed 2d ago), licensed Apache-2.0. It adds 80 tokens to every session and 233 once invoked, about $0.0004 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 2026-08-31.

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