Agent skill

B3 Analysis

Load this skill when analyzing Brazilian stocks listed on B3, building investment portfolios with Brazilian equities, or interpreting data from yfinance, BCB API, and Google News PT-BR.

No licenceAuto-check passedBusiness, Finance & HR

Install B3 Analysis

skills CLI

$ npx skills add guhcostan/b3analysis --skill b3-analysis -a claude-code

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

GitHub CLI

$ gh skill install guhcostan/b3analysis b3-analysis --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/guhcostan/b3analysis.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/b3-analysis .claude/skills/b3-analysis && 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 "b3-analysis" agent skill from https://github.com/guhcostan/b3analysis/tree/main/.claude/skills/b3-analysis into .claude/skills/b3-analysis/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "b3-analysis", 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/guhcostan/b3analysis/tree/main/.claude/skills/b3-analysis

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 guhcostan/b3analysis --skill b3-analysis -a codex

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

GitHub CLI

$ gh skill install guhcostan/b3analysis b3-analysis --agent codex

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

Manual copy

$ git clone --depth 1 https://github.com/guhcostan/b3analysis.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.claude/skills/b3-analysis .agents/skills/b3-analysis && 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 "b3-analysis" agent skill from https://github.com/guhcostan/b3analysis/tree/main/.claude/skills/b3-analysis into .agents/skills/b3-analysis/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "b3-analysis", 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 guhcostan/b3analysis --skill b3-analysis -a cursor

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

GitHub CLI

$ gh skill install guhcostan/b3analysis b3-analysis --agent cursor

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

Manual copy

$ git clone --depth 1 https://github.com/guhcostan/b3analysis.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.claude/skills/b3-analysis .cursor/skills/b3-analysis && 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 "b3-analysis" agent skill from https://github.com/guhcostan/b3analysis/tree/main/.claude/skills/b3-analysis into .cursor/skills/b3-analysis/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "b3-analysis", 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/guhcostan/b3analysis.git --path .claude/skills/b3-analysis

--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 guhcostan/b3analysis --skill b3-analysis -a gemini-cli

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

GitHub CLI

$ gh skill install guhcostan/b3analysis b3-analysis --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/guhcostan/b3analysis.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.claude/skills/b3-analysis .gemini/skills/b3-analysis && 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 "b3-analysis" agent skill from https://github.com/guhcostan/b3analysis/tree/main/.claude/skills/b3-analysis into .gemini/skills/b3-analysis/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "b3-analysis", 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 guhcostan/b3analysis b3-analysis

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 guhcostan/b3analysis --skill b3-analysis -a github-copilot

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

Manual copy

$ git clone --depth 1 https://github.com/guhcostan/b3analysis.git skills-src && mkdir -p .github/skills && cp -r skills-src/.claude/skills/b3-analysis .github/skills/b3-analysis && 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 "b3-analysis" agent skill from https://github.com/guhcostan/b3analysis/tree/main/.claude/skills/b3-analysis into .github/skills/b3-analysis/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "b3-analysis", 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 guhcostan/b3analysis --skill b3-analysis -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 guhcostan/b3analysis b3-analysis --agent opencode

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

Manual copy

$ git clone --depth 1 https://github.com/guhcostan/b3analysis.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.claude/skills/b3-analysis .opencode/skills/b3-analysis && 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 "b3-analysis" agent skill from https://github.com/guhcostan/b3analysis/tree/main/.claude/skills/b3-analysis into .opencode/skills/b3-analysis/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "b3-analysis", 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: b3-analysis
GitHub stars: 128
Token cost: ~1.5k tokens
SKILL.md length: 630 words
Files: 1
Skills in repo: 1
Repo updated: Mar 27, 2026
First seen: Oct 7, 2026
Licence: None found

At a glance

Load this skill when analyzing Brazilian stocks listed on B3, building investment portfolios with Brazilian equities, or interpreting data from yfinance, BCB API, and Google News PT-BR.

Tasks that involve Stock and market analysis
SKILL.md covers B3 Quality Checklist, Technical Indicator Reference, Macro Impact by Sector and Red Flags, plus 3 more sections
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

B3 Analysis is an agent skill from guhcostan/b3analysis. Load this skill when analyzing Brazilian stocks listed on B3, building investment portfolios with Brazilian equities, or interpreting data from yfinance, BCB API, and Google News PT-BR. Provides the quality methodology, technical indicator reference, and sector impact framework used in /analyze and /portfolio.

Its SKILL.md is about 1.5k 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 Business, Finance & HR, covering Stock and market analysis. It works with yfinance. The repository describes itself as: Agente de análise de ações brasileiras (B3) com Claude Code — sem API keys.

When your agent uses it

Tasks that involve Stock and market analysis

Example prompts

“/b3-analysis”

What it can do on your machine

Read from SKILL.md and the folder at commit 436c10e. 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.
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

B3 Analysis loads about 1.5k tokens when it runs. Until then it costs about 81 tokens; SKILL.md has 630 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~81
When it runs · the whole SKILL.md, loaded when a task matches: ~1.5k

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

Without a licence we can't republish the file, so here is its outline and opening line. It has 630 words (~1,465 tokens).

“Methodology from Logan's tier list (YouTube: @investimentosemevidencia). Criteria 1, 2, 3 are ELIMINATORY — fail any = automatic AVOID regardless of other factors.”

— opening of SKILL.md by guhcostan

name: b3-analysis

Read the full SKILL.md on GitHub

Files

Just SKILL.md in .claude/skills/b3-analysis of guhcostan/b3analysis.

Open the folder on GitHubat commit 436c10e

Compare with similar skills

B3 Analysis 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.

B3 Analysis compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
B3 Analysis this skillguhcostan/b3analysis	128	—	~1.5k	Automated safety check: Pass	None	6 mo ago
Stock Analysis24mlight/StockClaw	101	2 repos	~2k	Automated safety check: Notes	MIT	6 mo ago
Regimejackson-video-resources/markov-hedge-fund-method	483	—	~1.6k	Automated safety check: Pass	Custom licence	4 mo ago
Stock Value AnalyzerFunnyKun/stock-value-analyzer	140	—	~3.3k	Automated safety check: Pass	None	3 mo ago
Yahoo Finance24mlight/StockClaw	101	2 repos	~1.1k	Automated safety check: Notes	MIT	6 mo ago
Stock Analysisliusai0820/Stock-Analysis-Skill	141	—	~904	Automated safety check: Notes	None	7 mo ago

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Works with

yfinance

Questions about B3 Analysis

What does B3 Analysis do?

Load this skill when analyzing Brazilian stocks listed on B3, building investment portfolios with Brazilian equities, or interpreting data from yfinance, BCB API, and Google News PT-BR. B3 Analysis is an agent skill from guhcostan/b3analysis. Load this skill when analyzing Brazilian stocks listed on B3, building investment portfolios with Brazilian equities, or interpreting data from yfinance, BCB API, and Google News PT-BR.

When should I use B3 Analysis?

B3 Analysis fits situations like: tasks that involve Stock and market analysis.

How do I install B3 Analysis in Claude Code?

Run `npx skills add guhcostan/b3analysis --skill b3-analysis -a claude-code`. Or copy the skill folder (.claude/skills/b3-analysis in guhcostan/b3analysis) into .claude/skills/b3-analysis in your project. Claude Code loads it when a task matches its description.

How do I install B3 Analysis in Codex?

Run `npx skills add guhcostan/b3analysis --skill b3-analysis -a codex`. Or copy the skill folder (.claude/skills/b3-analysis in guhcostan/b3analysis) into .agents/skills/b3-analysis in your project. Codex loads it when a task matches its description.

Can I use B3 Analysis 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 guhcostan/b3analysis --skill b3-analysis -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/b3-analysis, .gemini/skills/b3-analysis, .github/skills/b3-analysis and .opencode/skills/b3-analysis in your project.

What does B3 Analysis need to run?

SKILL.md names no scripts, command-line tools or credentials: B3 Analysis is instructions for the agent only.

Does B3 Analysis 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 B3 Analysis 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 B3 Analysis use?

No licence was found for B3 Analysis or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.

How many tokens does B3 Analysis use?

About 1.5k tokens (SKILL.md is roughly 5.9k 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 B3 Analysis?

Skills that share tags, products or a category with B3 Analysis: Stock Analysis (24mlight/StockClaw, 101 stars), Regime (jackson-video-resources/markov-hedge-fund-method, 483 stars), Stock Value Analyzer (FunnyKun/stock-value-analyzer, 140 stars) and Yahoo Finance (24mlight/StockClaw, 101 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains B3 Analysis?

guhcostan (a GitHub user) maintains it in guhcostan/b3analysis, which has 128 GitHub stars. The repository was last updated on March 27, 2026.

Source: guhcostan/b3analysis on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install B3 Analysis

Facts

At a glance

What it does

When your agent uses it

Example prompts

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Files

Compare with similar skills

Similar skills

Stock Analysis

Regime

Stock Value Analyzer

Yahoo Finance

Stock Analysis

Yfinance

Related

Questions about B3 Analysis