Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/richfrem/agent-plugins-skillsnpx agentmods add skills/richfrem/agent-plugins-skills/plugin-syncerWrote 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/richfrem/agent-plugins-skills/plugin-syncer)<a href="https://agentmods.dev/skills/richfrem/agent-plugins-skills/plugin-syncer"><img src="https://agentmods.dev/badge/skills/richfrem/agent-plugins-skills/plugin-syncer/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/richfrem/agent-plugins-skills/plugin-syncer"><img src="https://agentmods.dev/badge/skills/richfrem/agent-plugins-skills/plugin-syncer.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 | $0.00074 | $0.00636 |
| Opus 5.5 | $0.00030 | $0.00254 |
| Sonnet 5.5 | $0.00015 | $0.00127 |
| Haiku 4.5 | $0.00007 | $0.00064 |
Grade A, and why
plugin-syncer 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 13d 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 — 63 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Plugin Syncer (plugin-syncer)
Synchronizes registered plugins from plugin-sources.json while enforcing .agents/ownership/ desired-state manifests.
Contents
Critical Constraints
- Canonical Sync Tool: Always run
sync_with_inventory.pyfor "sync" or "resync" requests; never callplugin_add.py. - Preserve Ownership States: Honoring
should_install: falsechoices in.agents/ownership/<plugin>.jsonis strictly required; disabled components must not be resurrected. - Dry-Run Preview: Preview proposed file modifications and symlink updates before executing live sync.
- Orphan Pruning: Stale or unreferenced symlinks pointing to disabled components must be cleaned automatically.
Quick start
# Preview synchronization changes (dry-run)
python3 plugins/plugin-manager/scripts/sync_with_inventory.py --dry-run
# Run full synchronization
python3 plugins/plugin-manager/scripts/sync_with_inventory.py
# Clean up stale artifacts only
python3 plugins/plugin-manager/scripts/sync_with_inventory.py --cleanup-only
Workflow
- Phase 1: Registry Scan: Read
.agents/plugin-sources.jsonand load ownership manifests from.agents/ownership/. - Phase 2: Preview & Diff: Execute with
--dry-runto inventory additions, deletions, and component toggles. - Phase 3: Component Synchronization: Deploy enabled components to
.agents/and remove assets marked"should_install": false. - Phase 4: Multi-IDE Pruning & Audit: Refresh symlinks across
.claude/and.gemini/environments and audit link health.
Verification
# Verify environment symlink health
python3 plugins/dev-utils/scripts/symlink_manager.py audit
# Audit skill compliance
python3 plugins/agent-scaffolders/scripts/audit_skill.py plugins/plugin-manager/skills/plugin-syncer --mode source
What ships with it
6 files 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.
- 13d ago Changed · +18 lines cf5c52af0ba9
- 18d ago Changed · +2 lines · +42 tokens per session 2c233d6dde57
- 29d ago First seen · 43 lines · 32 tokens per session scan A f80218fbc374
plugin-syncer is a skill published in the GitHub repository richfrem/agent-plugins-skills (7 stars, last pushed yesterday), licensed MIT. It adds 74 tokens to every session and 636 once invoked, about $0.0003 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 2026-09-17.
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