A running body-weight log that tracks changes over time and gives guidance about fueling, race-weight goals, and signs of eating too little.

Use it to record weight check-ins, set a race-weight target, review weekly and monthly trends, and spot possible under-fueling.

It helps distinguish normal changes from weight loss that is too fast or may hurt recovery and performance. It also sets a boundary for cases that need a dietitian or doctor.

pb-body — Skill for Claude Code by seungwee-choi

Install

Getting it into your agent

This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.

Claude Code

/plugin marketplace add seungwee-choi/oh-my-personal-best

Claude Code

/plugin install oh-my-personal-best

Made for: Claude Code.

Or install oh-my-personal-best, the plugin that ships this one along with the rest of its 11 skills, 11 commands, 8 agents.

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/seungwee-choi/oh-my-personal-best/pb-body/github.svg)](https://agentmods.dev/skills/seungwee-choi/oh-my-personal-best/pb-body)

Your own site

<a href="https://agentmods.dev/skills/seungwee-choi/oh-my-personal-best/pb-body"><img src="https://agentmods.dev/badge/skills/seungwee-choi/oh-my-personal-best/pb-body/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/seungwee-choi/oh-my-personal-best/pb-body"><img src="https://agentmods.dev/badge/skills/seungwee-choi/oh-my-personal-best/pb-body.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 21 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 603 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.

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	$0.00021	$0.00603
Opus 5	$0.00010	$0.00302
Sonnet 5	$0.00004	$0.00121
Haiku 4.5	$0.00002	$0.00060

Measured 12d ago against content hash 19fd2956e719, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

pb-body 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/pb-body/SKILL.md · 56 lines

How it starts

The opening of the file, as written. The whole thing — 56 lines — stays where its author put it; the contents beside it link to each section on GitHub.

<Use_When>

"오늘 체중 62.5", "weighed in at 62.5kg", weight check-ins
"레이스 체중 목표 60", "race weight", fueling for weight management
"요즘 살 빠지는데 괜찮아?", "왜 페이스가 안 나오지" (possible under-fueling) </Use_When>

<Do_Not_Use_When>

Signs of disordered eating, a clinical dietary condition, or rapid unexplained loss → fuel-advisor states the coaching boundary and refers to a registered dietitian / physician. Not a weight-loss app. </Do_Not_Use_When>

Step 1 — Log (if a weight was reported)

python3 "$CLAUDE_PLUGIN_ROOT/scripts/body.py" log --kg <float> [--bodyfat <float>] [--note "..."]

A race-weight goal: body.py set-target --kg <float> (merged into goal.json, never clobbering the race goal).

Step 2 — Read the trend

python3 "$CLAUDE_PLUGIN_ROOT/scripts/body.py" summary

Gives current weight, ma7/ma30, kg/week rate, race-weight gap, and the under-fueling flag.

Step 3 — Advise (fuel-advisor)

If the loss rate exceeds ~1%/week of bodyweight, or the under-fueling flag is set → LEAD with that: reassess intake and recovery before any leanness framing. Too-fast loss costs muscle, immunity, and performance.
Otherwise, ground daily/long-run/race fueling in the actual trend and the race-weight gap.

<Stop_Conditions>

$CLAUDE_PLUGIN_ROOT unset → run python3 scripts/body.py … from the repo.
Too few logs for a trend → log the entry and report only the current value; don't infer a rate from one point. </Stop_Conditions>

Read the full file on GitHub · 56 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 · 56 lines · 21 tokens per session scan A 19fd2956e719

Subscribe to this mod's changes

pb-body is a skill published in the GitHub repository seungwee-choi/oh-my-personal-best (3 stars, last pushed 12d ago), licensed MIT. It adds 21 tokens to every session and 603 once invoked, about $0.0001 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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