Borrowing it
Nothing to install: this file belongs to vchelaru/FlatRedBall2. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/vchelaru/FlatRedBall2/main/.claude/skills/skill-change-logging/SKILL.mdgit clone --depth 1 https://github.com/vchelaru/FlatRedBall2Wrote 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.
[](https://agentmods.dev/skills/vchelaru/flatredball2/skill-change-logging)<a href="https://agentmods.dev/skills/vchelaru/flatredball2/skill-change-logging"><img src="https://agentmods.dev/badge/skills/vchelaru/flatredball2/skill-change-logging/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.
<a href="https://agentmods.dev/skills/vchelaru/flatredball2/skill-change-logging"><img src="https://agentmods.dev/badge/skills/vchelaru/flatredball2/skill-change-logging.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 3 findings, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Agent Snooping · line 8 Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
- medium Agent Snooping · line 8 Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
- medium Agent Snooping · line 78 Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
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 | $0.00052 | $0.00921 |
| Opus 5.5 | $0.00021 | $0.00368 |
| Sonnet 5.5 | $0.00010 | $0.00184 |
| Haiku 4.5 | $0.00005 | $0.00092 |
Grade A, and why
skill-change-logging 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 16d 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.
How it starts
The opening of the file, as written. The whole thing — 80 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill Change Logging
Use this skill whenever a skill file changes — both the 3rd-party game-dev skills under frb-skills/ and the 1st-party engine-contributor skills under .claude/skills/. Log the canonical path (e.g. frb-skills/animation/SKILL.md, not the symlinked path).
Required Log File
- Path:
.claude/skill_change_log.jsonl - Format: one JSON object per line (JSONL)
When to Log
Always append one entry per changed skill when any of these occur:
SKILL.mdcontent edits- frontmatter
nameordescriptionupdates - new skill creation
- skill deletion
- significant skill restructure (for example, moving sections into references)
Do not skip logging because a change is "small". If behavior, routing, or guardrails changed, log it.
Required Fields Per Entry
Each JSON object must include:
id: integer UTC epoch milliseconds at write time (append-only friendly)timestamp_utc: ISO-8601 UTC timestamp at millisecond precision (YYYY-MM-DDTHH:mm:ss.fffZ)skill: skill name (folder name or frontmatter name)skill_file: repo-relative pathchange_type:create,update,delete, orrestructurelines_added: integer fromgit diff --numstatlines_removed: integer fromgit diff --numstatline_ranges_added: array of 1-based line ranges in the post-change file (e.g.["42-57","89-89"])line_ranges_removed: array of 1-based line ranges in the pre-change file (e.g.["40-52"])motivating_sample_project: sample project path that motivated the change, or"none"if not sample-drivenreason: concise but complete need statement
Logging Workflow
- Make skill edits.
- Run
git diff --numstat -- <skill-file-paths>. - Run
git diff -U0 -- <skill-file-paths>and capture hunk line ranges. - Set
idto current UTC epoch milliseconds. - Append one JSON line per changed skill to
.claude/skill_change_log.jsonl. - Keep reasons short, specific, and action-oriented.
ID Rules
- IDs are global across the file (not per skill).
- IDs must be unique; they do not need to be contiguous.
- Use UTC epoch milliseconds to avoid reading the existing log for max-id lookup.
- If two entries are created in the same millisecond, increment by
+1locally for subsequent entries in that write batch.
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.
- 16d ago Changed 962984e31afb
- 1mo ago First seen · 80 lines · 52 tokens per session scan A f7f2ca669fb4
skill-change-logging is a skill published in the GitHub repository vchelaru/FlatRedBall2 (15 stars, last pushed today), licensed MIT. It adds 52 tokens to every session and 921 once invoked, about $0.0002 per session on Opus 5.5. 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 2026-09-04.
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