Agent skill

Baremetal Startup

by mohitmishra786 in mohitmishra786/low-level-dev-skills

Bare-metal startup skill for reset-to-main bring-up. An agent skill from mohitmishra786/low-level-dev-skills.

MITAuto-check passedDevelopment

Install Baremetal Startup

skills CLI

$ npx skills add mohitmishra786/low-level-dev-skills --skill baremetal-startup -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install mohitmishra786/low-level-dev-skills baremetal-startup --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/mohitmishra786/low-level-dev-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/baremetal/baremetal-startup .claude/skills/baremetal-startup && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "baremetal-startup" agent skill from https://github.com/mohitmishra786/low-level-dev-skills/tree/main/skills/baremetal/baremetal-startup into .claude/skills/baremetal-startup/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "baremetal-startup", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/mohitmishra786/low-level-dev-skills/tree/main/skills/baremetal/baremetal-startup

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add mohitmishra786/low-level-dev-skills --skill baremetal-startup -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install mohitmishra786/low-level-dev-skills baremetal-startup --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/mohitmishra786/low-level-dev-skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/baremetal/baremetal-startup .agents/skills/baremetal-startup && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "baremetal-startup" agent skill from https://github.com/mohitmishra786/low-level-dev-skills/tree/main/skills/baremetal/baremetal-startup into .agents/skills/baremetal-startup/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "baremetal-startup", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add mohitmishra786/low-level-dev-skills --skill baremetal-startup -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install mohitmishra786/low-level-dev-skills baremetal-startup --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/mohitmishra786/low-level-dev-skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/baremetal/baremetal-startup .cursor/skills/baremetal-startup && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "baremetal-startup" agent skill from https://github.com/mohitmishra786/low-level-dev-skills/tree/main/skills/baremetal/baremetal-startup into .cursor/skills/baremetal-startup/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "baremetal-startup", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/mohitmishra786/low-level-dev-skills.git --path skills/baremetal/baremetal-startup

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add mohitmishra786/low-level-dev-skills --skill baremetal-startup -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install mohitmishra786/low-level-dev-skills baremetal-startup --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/mohitmishra786/low-level-dev-skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/baremetal/baremetal-startup .gemini/skills/baremetal-startup && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "baremetal-startup" agent skill from https://github.com/mohitmishra786/low-level-dev-skills/tree/main/skills/baremetal/baremetal-startup into .gemini/skills/baremetal-startup/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "baremetal-startup", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install mohitmishra786/low-level-dev-skills baremetal-startup

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add mohitmishra786/low-level-dev-skills --skill baremetal-startup -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/mohitmishra786/low-level-dev-skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/baremetal/baremetal-startup .github/skills/baremetal-startup && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "baremetal-startup" agent skill from https://github.com/mohitmishra786/low-level-dev-skills/tree/main/skills/baremetal/baremetal-startup into .github/skills/baremetal-startup/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "baremetal-startup", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add mohitmishra786/low-level-dev-skills --skill baremetal-startup -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install mohitmishra786/low-level-dev-skills baremetal-startup --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/mohitmishra786/low-level-dev-skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/baremetal/baremetal-startup .opencode/skills/baremetal-startup && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "baremetal-startup" agent skill from https://github.com/mohitmishra786/low-level-dev-skills/tree/main/skills/baremetal/baremetal-startup into .opencode/skills/baremetal-startup/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "baremetal-startup", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: baremetal-startup
GitHub stars: 252
Token cost: ~1.2k tokens
SKILL.md length: 294 words
Files: 1
Skills in repo: 138
Repo updated: Jun 27, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Bare-metal startup skill for reset-to-main bring-up. An agent skill from mohitmishra786/low-level-dev-skills.

Works in 7 steps: Boot sequence mental model → Cortex-M vector table → VTOR relocation (Cortex-M) → …
Writing startup code
SKILL.md covers Purpose, When to Use, Workflow and Common Problems, plus 1 more section
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Baremetal Startup is an agent skill from mohitmishra786/low-level-dev-skills. Bare-metal startup skill for reset-to-main bring-up. Use when writing startup code, vector tables, .data/.bss init, stack setup, or crt0 for Cortex-M/RISC-V. Activates on queries about reset vector, VTOR, startup.s, bss init, or bare-metal entry point.

Its SKILL.md is about 1.2k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Development. The repository describes itself as: A curated suite of AI agent skills for systems and low-level programming with C/C++, Rust, and Zig toolchains, covering compilers, debuggers, profilers, build systems…. The licence is MIT.

When your agent uses it

Writing startup code
.data/.bss init
Crt0 for Cortex-M/RISC-V

Example prompts

“/baremetal-startup”

Workflow steps

7 steps, taken from the step headings in SKILL.md.

Boot sequence mental model
Cortex-M vector table
VTOR relocation (Cortex-M)
RISC-V startup (overview)
crt0 responsibilities
Linker script integration
Agent usage examples

What it can do on your machine

Read from SKILL.md and the folder at commit bdc5847. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are asm, c and ld).
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Baremetal Startup loads about 1.2k tokens when it runs. Until then it costs about 68 tokens; SKILL.md has 294 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~68
When it runs · the whole SKILL.md, loaded when a task matches: ~1.2k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from mohitmishra786/low-level-dev-skills at commit bdc5847, republished under its MIT licence (© mohitmishra786). 294 words, ~1,222 tokens.

Download SKILL.mdSave it as .claude/skills/baremetal-startup/SKILL.md (or your agent's skills folder).

name: baremetal-startup
description: Bare-metal startup skill for reset-to-main bring-up. Use when writing startup code, vector tables, .data/.bss init, stack setup, or crt0 for Cortex-M/RISC-V. Activates on queries about reset vector, VTOR, startup.s, bss init, or bare-metal entry point.

Bare-Metal Startup

Purpose

Guide agents through bare-metal startup from reset to main(): reset and exception vectors, .data/.bss initialization, stack and heap setup, C runtime integration with linker scripts, and common Cortex-M and RISC-V bring-up bugs.

When to Use

Firmware hangs before reaching main()
Porting to a new MCU without vendor HAL
Writing custom startup.s or Reset_Handler
Integrating with skills/embedded/linker-scripts
Debugging uninitialized globals or stack overflows at boot

Workflow

1. Boot sequence mental model

Power-on / reset
├── CPU loads SP from vector[0]
├── CPU branches to Reset_Handler from vector[1]
├── Reset_Handler: init clocks (optional), copy .data, zero .bss
├── Configure stack pointer (if not already from vector)
├── Call SystemInit() / platform_init()
└── Call main() — must not return (loop or WFI)

2. Cortex-M vector table

On Cortex-M, the vector table starts at address 0 or a relocatable base (VTOR):

Index	Entry
0	Initial stack pointer (`_estack`)
1	`Reset_Handler`
2	`NMI_Handler`
3	`HardFault_Handler`
4+	IRQ handlers per NVIC

asm

/* startup.s — minimal Cortex-M */
.syntax unified
.thumb

.section .isr_vector,"a",%progbits
.global g_pfnVectors
g_pfnVectors:
    .word _estack
    .word Reset_Handler
    .word NMI_Handler
    .word HardFault_Handler
    /* ... device IRQ vectors from vendor CMSIS ... */

.section .text.Reset_Handler
.thumb_func
.global Reset_Handler
Reset_Handler:
    ldr r0, =_sidata    /* .data load address (LMA) */
    ldr r1, =_sdata     /* .data VMA start */
    ldr r2, =_edata
    b LoopCopyDataInit
CopyDataInit:
    ldr r3, [r0], #4
    str r3, [r1], #4
LoopCopyDataInit:
    cmp r1, r2
    blt CopyDataInit
    ldr r2, =_sbss
    ldr r4, =_ebss
    movs r3, #0
    b LoopFillZerobss
FillZerobss:
    str r3, [r2], #4
LoopFillZerobss:
    cmp r2, r4
    blt FillZerobss
    bl SystemInit
    bl main
    b .

/* Linker symbols — declared extern in startup */
extern uint32_t _estack, _sidata, _sdata, _edata, _sbss, _ebss;

3. VTOR relocation (Cortex-M)

#include "core_cm4.h"  /* CMSIS */

void relocate_vector_table(uint32_t base) {
    SCB->VTOR = base & 0xFFFFFF80U;  /* must be aligned per ARM ref manual */
    __DSB();
    __ISB();
}

Bootloader jumping to app often requires setting VTOR to the application's vector table address (e.g., 0x08020000 on STM32 flash).

4. RISC-V startup (overview)

asm

/* entry.S — simplified */
.section .text.entry
.global _start
_start:
    la sp, _stack_top
    la t0, _bss_start
    la t1, _bss_end
clear_bss:
    beq t0, t1, bss_done
    sw zero, 0(t0)
    addi t0, t0, 4
    j clear_bss
bss_done:
    call main
    j .

Trap vector: mtvec for M-mode; see skills/platform/riscv-privileged.

5. crt0 responsibilities

Task	Who does it
Copy `.data` LMA→VMA	`Reset_Handler` / crt0
Zero `.bss`	`Reset_Handler`
Init stack	Vector[0] or explicit `sp`
Heap (`_sbrk`)	Optional; libc or custom
C++ constructors	`__libc_init_array()` if using full libc
FPU enable	`SystemInit` on Cortex-M4F/M7

6. Linker script integration

_estack = ORIGIN(RAM) + LENGTH(RAM);
_sidata = LOADADDR(.data);

Cross-link skills/embedded/linker-scripts for MEMORY/SECTIONS layout.

7. Agent usage examples

/baremetal-startup My STM32 never reaches main — what should Reset_Handler do?
/baremetal-startup How do I relocate the vector table after bootloader jump?

Common Problems

Symptom	Cause	Fix
HardFault immediately	Stack pointer invalid	Set `_estack` to valid RAM top
Globals wrong at boot	`.data` not copied	Copy LMA→VMA in Reset_Handler
BSS non-zero	`.bss` not zeroed	Add bss clear loop
IRQs don't fire	VTOR points to wrong table	`SCB->VTOR = app_vector_addr`
`main` returns into garbage	No loop after main	`while(1)` or `WFI` loop
C++ static init crash	Constructors before clocks	Call `SystemInit` first

skills/embedded/linker-scripts — _estack, LMA/VMA, section placement
skills/baremetal/interrupts-and-exceptions-baremetal — vector table IRQ entries
skills/baremetal/bootloaders-embedded — VTOR relocation on app jump
skills/embedded/openocd-jtag — halt at Reset_Handler with GDB
skills/low-level-programming/assembly-arm — Thumb-2 syntax
skills/platform/riscv-privileged — RISC-V trap setup

Files

Just SKILL.md in skills/baremetal/baremetal-startup of mohitmishra786/low-level-dev-skills.

Open the folder on GitHubat commit bdc5847

Compare with similar skills

Baremetal Startup next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Baremetal Startup compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Baremetal Startup this skillmohitmishra786/low-level-dev-skills	252	—	~1.2k	Automated safety check: Pass	MIT	3 mo ago
Vercel Composition Patternssupabase/supabase	111k	58 repos	~726	Automated safety check: Pass	MIT	yesterday
Finishing a Development Branchobra/superpowers	297k	5 repos	~1.9k	Automated safety check: Pass	MIT	yesterday
Typescript Advanced Typesrolling-scopes/rsschool-app	10k	25 repos	~4.2k	Automated safety check: Pass	MPL-2.0	6 days ago
PR Babysitteropeninterpreter/openinterpreter	69k	3 repos	~4.2k	Automated safety check: Pass	Apache-2.0	today
Code Review ChecklistshareAI-lab/learn-claude-code	78k	4 repos	~1.1k	Automated safety check: Pass	MIT	12 days ago

Similar skills

Vercel Composition Patterns
supabase/supabase
Official
React composition patterns that scale. An agent skill from supabase/supabase.
111k GitHub starsUsed in 58 repos~726 tokens
DevelopmentAuto-check passed
Finishing a Development Branch
obra/superpowers
Walks the last step of a branch: confirm tests pass, detect the git environment, ask how to integrate, carry out your choice and clean up the worktree.
297k GitHub starsUsed in 5 repos~1.9k tokens
DevelopmentAuto-check passed
Typescript Advanced Types
rolling-scopes/rsschool-app
Master TypeScript's advanced type system including generics, conditional types, mapped types, template literals, and utility types for building type-safe applications.
10k GitHub starsUsed in 25 repos~4.2k tokens
DevelopmentAuto-check passed
PR Babysitter
openinterpreter/openinterpreter
Watches an open GitHub pull request until it merges, handling review comments, diagnosing CI failures and retrying flaky checks along the way.
69k GitHub starsUsed in 3 repos~4.2k tokens
DevelopmentAuto-check passed
Code Review Checklist
shareAI-lab/learn-claude-code
Reviews code against a five-part checklist covering security, correctness, performance, maintainability and testing, and reports findings in a fixed format.
78k GitHub starsUsed in 4 repos~1.1k tokens
DevelopmentAuto-check passed
Greploop
onyx-dot-app/onyx
Iteratively improves a PR (GitHub), MR (GitLab), or shelved changelist (Perforce) until Greptile gives it a 5/5 confidence score with zero unresolved comments.
32k GitHub starsUsed in 4 repos~3.3k tokens
DevelopmentAuto-check passed

Questions about Baremetal Startup

What does Baremetal Startup do?

Bare-metal startup skill for reset-to-main bring-up. An agent skill from mohitmishra786/low-level-dev-skills. Baremetal Startup is an agent skill from mohitmishra786/low-level-dev-skills. Bare-metal startup skill for reset-to-main bring-up.

When should I use Baremetal Startup?

Baremetal Startup fits situations like: writing startup code; .data/.bss init; crt0 for Cortex-M/RISC-V.

How do I install Baremetal Startup in Claude Code?

Run `npx skills add mohitmishra786/low-level-dev-skills --skill baremetal-startup -a claude-code`. Or copy the skill folder (skills/baremetal/baremetal-startup in mohitmishra786/low-level-dev-skills) into .claude/skills/baremetal-startup in your project. Claude Code loads it when a task matches its description.

How do I install Baremetal Startup in Codex?

Run `npx skills add mohitmishra786/low-level-dev-skills --skill baremetal-startup -a codex`. Or copy the skill folder (skills/baremetal/baremetal-startup in mohitmishra786/low-level-dev-skills) into .agents/skills/baremetal-startup in your project. Codex loads it when a task matches its description.

Can I use Baremetal Startup in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add mohitmishra786/low-level-dev-skills --skill baremetal-startup -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/baremetal-startup, .gemini/skills/baremetal-startup, .github/skills/baremetal-startup and .opencode/skills/baremetal-startup in your project.

What does Baremetal Startup need to run?

SKILL.md names no scripts, command-line tools or credentials: Baremetal Startup is instructions for the agent only.

Does Baremetal Startup access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Baremetal Startup safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Baremetal Startup use?

Baremetal Startup is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Baremetal Startup use?

About 1.2k tokens (SKILL.md is roughly 4.9k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Baremetal Startup?

Skills that share tags, products or a category with Baremetal Startup: Vercel Composition Patterns (supabase/supabase, 111k stars), Finishing a Development Branch (obra/superpowers, 297k stars), Typescript Advanced Types (rolling-scopes/rsschool-app, 10k stars) and PR Babysitter (openinterpreter/openinterpreter, 69k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Baremetal Startup?

mohitmishra786 (a GitHub user) maintains it in mohitmishra786/low-level-dev-skills, which has 252 GitHub stars. The repository holds 138 skills in this directory. The repository was last updated on June 27, 2026.

Source: mohitmishra786/low-level-dev-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Baremetal Startup

Facts

At a glance

What it does

When your agent uses it

Example prompts

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Bare-Metal Startup

Purpose

When to Use

Workflow

1. Boot sequence mental model

2. Cortex-M vector table

3. VTOR relocation (Cortex-M)

4. RISC-V startup (overview)

5. crt0 responsibilities

6. Linker script integration

7. Agent usage examples

Common Problems

Related Skills

Files

Compare with similar skills

Similar skills

More from mohitmishra786/low-level-dev-skills

Related

Questions about Baremetal Startup