Agent skill

Vital Sign Extraction

by benchflow-ai in benchflow-ai/skillsbench

Estimate heart rate (HR) and breathing rate (BR) in bpm from a cleaned 1-D physiological time series such as radar phase, WiFi CSI amplitude, PPG, or a chest-motion signal.

Apache-2.0Auto-check passedData & Analytics

Install Vital Sign Extraction

skills CLI

$ npx skills add benchflow-ai/skillsbench --skill vital-sign-extraction -a claude-code

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

GitHub CLI

$ gh skill install benchflow-ai/skillsbench vital-sign-extraction --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/benchflow-ai/skillsbench.git skills-src && mkdir -p .claude/skills && cp -r skills-src/tasks/radar-vital-signs/environment/skills/vital-sign-extraction .claude/skills/vital-sign-extraction && 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 "vital-sign-extraction" agent skill from https://github.com/benchflow-ai/skillsbench/tree/main/tasks/radar-vital-signs/environment/skills/vital-sign-extraction into .claude/skills/vital-sign-extraction/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "vital-sign-extraction", 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/benchflow-ai/skillsbench/tree/main/tasks/radar-vital-signs/environment/skills/vital-sign-extraction

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 benchflow-ai/skillsbench --skill vital-sign-extraction -a codex

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

GitHub CLI

$ gh skill install benchflow-ai/skillsbench vital-sign-extraction --agent codex

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

Manual copy

$ git clone --depth 1 https://github.com/benchflow-ai/skillsbench.git skills-src && mkdir -p .agents/skills && cp -r skills-src/tasks/radar-vital-signs/environment/skills/vital-sign-extraction .agents/skills/vital-sign-extraction && 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 "vital-sign-extraction" agent skill from https://github.com/benchflow-ai/skillsbench/tree/main/tasks/radar-vital-signs/environment/skills/vital-sign-extraction into .agents/skills/vital-sign-extraction/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "vital-sign-extraction", 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 benchflow-ai/skillsbench --skill vital-sign-extraction -a cursor

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

GitHub CLI

$ gh skill install benchflow-ai/skillsbench vital-sign-extraction --agent cursor

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

Manual copy

$ git clone --depth 1 https://github.com/benchflow-ai/skillsbench.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/tasks/radar-vital-signs/environment/skills/vital-sign-extraction .cursor/skills/vital-sign-extraction && 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 "vital-sign-extraction" agent skill from https://github.com/benchflow-ai/skillsbench/tree/main/tasks/radar-vital-signs/environment/skills/vital-sign-extraction into .cursor/skills/vital-sign-extraction/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "vital-sign-extraction", 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/benchflow-ai/skillsbench.git --path tasks/radar-vital-signs/environment/skills/vital-sign-extraction

--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 benchflow-ai/skillsbench --skill vital-sign-extraction -a gemini-cli

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

GitHub CLI

$ gh skill install benchflow-ai/skillsbench vital-sign-extraction --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/benchflow-ai/skillsbench.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/tasks/radar-vital-signs/environment/skills/vital-sign-extraction .gemini/skills/vital-sign-extraction && 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 "vital-sign-extraction" agent skill from https://github.com/benchflow-ai/skillsbench/tree/main/tasks/radar-vital-signs/environment/skills/vital-sign-extraction into .gemini/skills/vital-sign-extraction/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "vital-sign-extraction", 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 benchflow-ai/skillsbench vital-sign-extraction

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 benchflow-ai/skillsbench --skill vital-sign-extraction -a github-copilot

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

Manual copy

$ git clone --depth 1 https://github.com/benchflow-ai/skillsbench.git skills-src && mkdir -p .github/skills && cp -r skills-src/tasks/radar-vital-signs/environment/skills/vital-sign-extraction .github/skills/vital-sign-extraction && 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 "vital-sign-extraction" agent skill from https://github.com/benchflow-ai/skillsbench/tree/main/tasks/radar-vital-signs/environment/skills/vital-sign-extraction into .github/skills/vital-sign-extraction/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "vital-sign-extraction", 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 benchflow-ai/skillsbench --skill vital-sign-extraction -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 benchflow-ai/skillsbench vital-sign-extraction --agent opencode

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

Manual copy

$ git clone --depth 1 https://github.com/benchflow-ai/skillsbench.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/tasks/radar-vital-signs/environment/skills/vital-sign-extraction .opencode/skills/vital-sign-extraction && 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 "vital-sign-extraction" agent skill from https://github.com/benchflow-ai/skillsbench/tree/main/tasks/radar-vital-signs/environment/skills/vital-sign-extraction into .opencode/skills/vital-sign-extraction/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "vital-sign-extraction", 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: vital-sign-extraction
GitHub stars: 1.8k
Token cost: ~925 tokens
SKILL.md length: 301 words
Files: 3 (incl. references)
Skills in repo: 189
Repo updated: Jul 23, 2026
First seen: Oct 7, 2026
Licence: Apache-2.0

At a glance

Estimate heart rate (HR) and breathing rate (BR) in bpm from a cleaned 1-D physiological time series such as radar phase, WiFi CSI amplitude, PPG, or a chest-motion signal.

Works in 4 steps: Split into BR and HR bands with two… → Peak frequency via zero-padded Welch PSD → HR harmonic rejection — always run → …
Claude needs to choose HR/BR bandpass edges
SKILL.md covers Pipeline (do every step), Decision rules, Sanity checks before reporting and Why the band edges above, not…, plus 2 more sections
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Vital Sign Extraction is an agent skill from benchflow-ai/skillsbench. Estimate heart rate (HR) and breathing rate (BR) in bpm from a cleaned 1-D physiological time series such as radar phase, WiFi CSI amplitude, PPG, or a chest-motion signal. Use when Claude needs to choose HR/BR bandpass edges, pick a peak frequency from a noisy band, reject the HR second harmonic that often dominates the fundamental, handle respiration-harmonic leakage into the HR band on slow breathers, or flag low-confidence estimates. Not for arrhythmia / beat-to-beat analysis, multi-subject source separation…

Its SKILL.md is about 930 tokens, which your agent loads only when the skill is triggered. The skill folder holds 3 other files, including reference files (for example `references/band-rationale.md` and `references/harmonic-pitfalls.md`).

It sits in Data & Analytics, covering Forecasting and time series. The repository describes itself as: SkillsBench evaluates how well skills work and how effective agents are at using them. The licence is Apache-2.0.

When your agent uses it

Claude needs to choose HR/BR bandpass edges
Pick a peak frequency from a noisy band
Reject the HR second harmonic that often dominates the fundamental
Handle respiration-harmonic leakage into the HR band on slow breathers

Example prompts

“/vital-sign-extraction”

Requirements

Python 3

Workflow steps

4 steps, taken from the first numbered list in SKILL.md.

Split into BR and HR bands with two separate bandpasses
Peak frequency via zero-padded Welch PSD
HR harmonic rejection — always run
Cross-check with autocorrelation

What it can do on your machine

Read from SKILL.md and the folder at commit 9a1f4dd. 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 python).
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

Vital Sign Extraction loads about 925 tokens when it runs, and up to ~2.6k if it reads all its reference files. Until then it costs about 143 tokens; SKILL.md has 301 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~143
When it runs · the whole SKILL.md, loaded when a task matches: ~925
With references · SKILL.md plus every file in references/, read only if the agent opens them: ~2.6k

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 benchflow-ai/skillsbench at commit 9a1f4dd, republished under its Apache-2.0 licence (© benchflow-ai). 301 words, ~925 tokens.

Download SKILL.mdSave it as .claude/skills/vital-sign-extraction/SKILL.md (or your agent's skills folder). This skill also uses 2 other files; get the full folder from GitHub.

name: vital-sign-extraction
description: Estimate heart rate (HR) and breathing rate (BR) in bpm from a cleaned 1-D physiological time series such as radar phase, WiFi CSI amplitude, PPG, or a chest-motion signal. Use when Claude needs to choose HR/BR bandpass edges, pick a peak frequency from a noisy band, reject the HR second harmonic that often dominates the fundamental, handle respiration-harmonic leakage into the HR band on slow breathers, or flag low-confidence estimates. Not for arrhythmia / beat-to-beat analysis, multi-subject source separation, or rapidly non-stationary rates.

Vital-Sign Extraction

Given a cleaned 1-D periodic signal (radar phase, WiFi CSI, PPG, piezo), estimate heart rate and breathing rate in bpm.

Upstream ingestion of radar captures is the radar-signal-processing skill. This skill picks up after a 1-D signal is extracted.

Pipeline (do every step)

Split into BR and HR bands with two separate bandpasses:
- BR: butter(4, [0.08, 0.5], btype='band', fs=fs) — 4.8–30 bpm
- HR: butter(4, [0.7, 3.0], btype='band', fs=fs) — 42–180 bpm

Peak frequency via zero-padded Welch PSD:

python

nperseg = min(len(x), int(fs * 25))
f, p = welch(x, fs=fs, nperseg=nperseg, noverlap=nperseg//2,
             nfft=8*nperseg, detrend='constant')
in_band = (f >= lo) & (f <= hi)
peak_hz = f[in_band][np.argmax(p[in_band])]

HR harmonic rejection — always run:

python

f_sub = f_peak / 2.0
if 0.7 <= f_sub <= 3.0:
    p_sub = np.interp(f_sub, f, p)
    p_top = np.interp(f_peak, f, p)
    if p_sub > 0.5 * p_top:
        f_peak = f_sub          # the peak was the 2nd harmonic
hr_bpm = f_peak * 60

Cross-check with autocorrelation:

python

ac = np.correlate(x - x.mean(), x - x.mean(), mode='full')
ac = ac[len(ac)//2:] / ac[len(ac)//2]
lag = int(fs/f_hi) + np.argmax(ac[int(fs/f_hi):int(fs/f_lo)])
bpm_ac = 60 * fs / lag

If abs(bpm_ac - bpm_psd) > 5, flag as low confidence.

Decision rules

If	Then
`f_peak/2` in HR band and `p_sub > 0.5 × p_top`	Pick sub-harmonic (fundamental)
PSD and autocorrelation disagree by > 5 bpm	Flag low confidence; do not commit to one value
BR estimate < 10 bpm (slow breather)	Expect HR-band contamination — see references/harmonic-pitfalls.md
HR > 150 bpm (tachycardia)	Widen HR band upper to 3.3 Hz, re-estimate
Clip < 15 s long	PSD bin spacing > tolerance — prefer autocorrelation or flag inconclusive

Show full SKILL.md (137 more words)Show less

Sanity checks before reporting

BR < HR. Always true for a live adult at rest — if violated you swapped bands.
HR × duration_minutes ≈ peak count in find_peaks(bandpassed_hr). Off by 2× → harmonic error slipped through.
Resting adult plausibility: HR 50–90 bpm, BR 10–20 bpm. Way outside → re-check band edges, decimation factor, and harmonic rejection.

Why the band edges above, not textbook 0.1–0.5 / 0.8–2.5

See references/band-rationale.md. Short version: textbook bands miss slow breathers (supine clinical subjects breathe 5–10 bpm) and bradycardia (athletes, post-tilt-down).

Why HR-harmonic and BR-leakage are critical

See references/harmonic-pitfalls.md. These are the two failure modes that cost naïve pipelines the most accuracy on real data.

Not in scope

Arrhythmia / irregular rhythms — use R-peak / foot detection + RR-interval analysis, not PSD.
Multiple subjects in one signal — run source separation first.
Rapidly non-stationary rate (exercise ramp) — use a spectrogram, not single-window PSD.

Files

SKILL.md and 2 other files (references) in tasks/radar-vital-signs/environment/skills/vital-sign-extraction of benchflow-ai/skillsbench.

SKILL.md
references/band-rationale.md
references/harmonic-pitfalls.md

Open the folder on GitHubat commit 9a1f4dd

Compare with similar skills

Vital Sign Extraction 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.

Vital Sign Extraction compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Vital Sign Extraction this skillbenchflow-ai/skillsbench	1.8k	—	~925	Automated safety check: Pass	Apache-2.0	2 mo ago
TimesFM Forecastinggoogle-research/timesfm	34k	—	~4.7k	Automated safety check: Pass	Apache-2.0	11 days ago
StatsmodelszLanqing/codex-claude-academic-skills	4.7k	15 repos	~4.9k	Automated safety check: Pass	BSD-3-Clause	5 mo ago
Timesfm ForecastingzLanqing/codex-claude-academic-skills	4.7k	3 repos	~7.5k	Automated safety check: Notes	Apache-2.0	5 mo ago
Find Hypertable Candidatestimescale/pg-aiguide	1.9k	1 repos	~2.6k	Automated safety check: Pass	Apache-2.0	3 days ago
Pensieve Searcharkohut/pensieve	1.4k	—	~8.2k	Automated safety check: Pass	Apache-2.0	2 mo ago

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Questions about Vital Sign Extraction

What does Vital Sign Extraction do?

Estimate heart rate (HR) and breathing rate (BR) in bpm from a cleaned 1-D physiological time series such as radar phase, WiFi CSI amplitude, PPG, or a chest-motion signal. Vital Sign Extraction is an agent skill from benchflow-ai/skillsbench. Estimate heart rate (HR) and breathing rate (BR) in bpm from a cleaned 1-D physiological time series such as radar phase, WiFi CSI amplitude, PPG, or a chest-motion signal.

When should I use Vital Sign Extraction?

Vital Sign Extraction fits situations like: Claude needs to choose HR/BR bandpass edges; pick a peak frequency from a noisy band; reject the HR second harmonic that often dominates the fundamental; handle respiration-harmonic leakage into the HR band on slow breathers.

How do I install Vital Sign Extraction in Claude Code?

Run `npx skills add benchflow-ai/skillsbench --skill vital-sign-extraction -a claude-code`. Or copy the skill folder (tasks/radar-vital-signs/environment/skills/vital-sign-extraction in benchflow-ai/skillsbench) into .claude/skills/vital-sign-extraction in your project. Claude Code loads it when a task matches its description.

How do I install Vital Sign Extraction in Codex?

Run `npx skills add benchflow-ai/skillsbench --skill vital-sign-extraction -a codex`. Or copy the skill folder (tasks/radar-vital-signs/environment/skills/vital-sign-extraction in benchflow-ai/skillsbench) into .agents/skills/vital-sign-extraction in your project. Codex loads it when a task matches its description.

Can I use Vital Sign Extraction 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 benchflow-ai/skillsbench --skill vital-sign-extraction -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/vital-sign-extraction, .gemini/skills/vital-sign-extraction, .github/skills/vital-sign-extraction and .opencode/skills/vital-sign-extraction in your project.

What does Vital Sign Extraction need to run?

SKILL.md names no scripts, command-line tools or credentials: Vital Sign Extraction is instructions for the agent only. Our summary lists: Python 3.

Does Vital Sign Extraction 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 Vital Sign Extraction 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 Vital Sign Extraction use?

Vital Sign Extraction is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Vital Sign Extraction use?

About 925 tokens (SKILL.md is roughly 3.7k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 1.7k tokens, read only when the agent opens those files.

What are the alternatives to Vital Sign Extraction?

Skills that share tags, products or a category with Vital Sign Extraction: TimesFM Forecasting (google-research/timesfm, 34k stars), Statsmodels (zLanqing/codex-claude-academic-skills, 4.7k stars), Timesfm Forecasting (zLanqing/codex-claude-academic-skills, 4.7k stars) and Find Hypertable Candidates (timescale/pg-aiguide, 1.9k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Vital Sign Extraction?

benchflow-ai (a GitHub organization) maintains it in benchflow-ai/skillsbench, which has 1,835 GitHub stars. The repository holds 189 skills in this directory. The repository was last updated on July 23, 2026.

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

Install Vital Sign Extraction

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Vital-Sign Extraction

Pipeline (do every step)

Decision rules

Sanity checks before reporting

Why the band edges above, not textbook 0.1–0.5 / 0.8–2.5

Why HR-harmonic and BR-leakage are critical

Not in scope

Files

Compare with similar skills

Similar skills

More from benchflow-ai/skillsbench

Related

Questions about Vital Sign Extraction