Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add himanshusaleria/gtm-engine --skill whats-newgit clone --depth 1 https://github.com/himanshusaleria/gtm-engineWrote 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/himanshusaleria/gtm-engine/whats-new)<a href="https://agentmods.dev/skills/himanshusaleria/gtm-engine/whats-new"><img src="https://agentmods.dev/badge/skills/himanshusaleria/gtm-engine/whats-new/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/himanshusaleria/gtm-engine/whats-new"><img src="https://agentmods.dev/badge/skills/himanshusaleria/gtm-engine/whats-new.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00000 | $0.01122 |
| Opus 5 | $0.00000 | $0.00561 |
| Sonnet 5 | $0.00000 | $0.00224 |
| Haiku 4.5 | $0.00000 | $0.00112 |
Grade A, and why
whats-new 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 11d 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 — 144 lines — stays where its author put it; the contents beside it link to each section on GitHub.
What's New — Update Checker
Checks if the GTM Engine has been updated since the user last checked, shows changelog entries for new versions, and offers to reinstall updated skills.
Invocation
/whats-new-- Check for updates
Instructions
Step 1: Read current version
Read the VERSION file from the repo root. Store as current_version.
If the VERSION file does not exist, display an error:
Could not find VERSION file. Make sure you're in the GTM Engine repo root.
And stop.
Step 2: Read last seen version
Read config/config.yaml and extract the last_seen_version field.
If config.yaml does not exist, display:
No config found. Run /setup first to initialize the GTM Engine.
And stop.
Store as last_seen_version.
Step 3: Compare versions
If current_version equals last_seen_version:
Display:
## You're up to date!
**Current version:** [current_version]
No new changes since you last checked.
Then skip to Step 7 (still check for skill drift).
If versions differ, proceed to Step 4.
Step 4: Show changelog
Read CHANGELOG.md from the repo root.
Parse the changelog to find all version entries. Show only the entries that are NEWER than last_seen_version.
Display:
## New Updates Available!
**Your version:** [last_seen_version] -> **Latest:** [current_version]
---
[Paste the relevant changelog entries here, preserving markdown formatting]
Step 5: Check for framework changes
- List all
.mdfiles in theframeworks/directory - Read
config/config.yamlto see if there's a record of known frameworks (if you added aknown_frameworksfield previously) - If new framework files exist that aren't in the user's context, list them:
### New Frameworks Added
- [framework name] — [one-line description from the file's first heading]
These frameworks will be automatically available in your conversations.
If no new frameworks, skip this section.
Step 6: Check for skill updates
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 11d ago First seen · 144 lines · 0 tokens per session scan A 24ec25d9f169
whats-new is a skill published in the GitHub repository himanshusaleria/gtm-engine (18 stars, last pushed 1mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 1,122 tokens. 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 2026-08-30.
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