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 systempromptio/systemprompt-marketplace --skill reddit-post-composergit clone --depth 1 https://github.com/systempromptio/systemprompt-marketplaceWrote 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/systempromptio/systemprompt-marketplace/reddit-post-composer)<a href="https://agentmods.dev/skills/systempromptio/systemprompt-marketplace/reddit-post-composer"><img src="https://agentmods.dev/badge/skills/systempromptio/systemprompt-marketplace/reddit-post-composer/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/systempromptio/systemprompt-marketplace/reddit-post-composer"><img src="https://agentmods.dev/badge/skills/systempromptio/systemprompt-marketplace/reddit-post-composer.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 | $0.00087 | $0.03806 |
| Opus 5 | $0.00044 | $0.01903 |
| Sonnet 5 | $0.00017 | $0.00761 |
| Haiku 4.5 | $0.00009 | $0.00381 |
Grade A, and why
reddit-post-composer 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 8d 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.
The source is not reproduced here
No licence file
A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.
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.
- 8d ago First seen · 255 lines · 87 tokens per session scan A 0286e352ca21
reddit-post-composer is a skill published in the GitHub repository systempromptio/systemprompt-marketplace (2 stars, last pushed 14d ago), with no licence file. It adds 87 tokens to every session and 3,806 once invoked, about $0.0004 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 2026-09-03.
Other skills, from other repositories
extract-ssot
Deduplicate repeated markdown content, rule files, skill bodies, ADRs, docs, into a single named source of truth and migrate every call site to cite it by exact heading. Use when the same prose, literal, or concept appears (or is reworded) across files: 'DRY this prose', 'extract a shared rule', 'single source of…
audit-encapsulation
Audit and remediate skill-encapsulation violations. External citations reaching into private surfaces inside .claude/skills/ / or plugins/ /skills/ / (marketplace monorepos) beyond the slash invocation. Use when: 'audit encapsulation', 'find skill leaks', 'skill boundary violation', 'who is reaching into ', 'check…
audit-progressive-disclosure
Read-only progressive-disclosure audit for agent-facing instruction markdown. Grades every target against a three-tier load-cost model (always-loaded / invocation-loaded / on-demand) and classifies seven finding shapes in two lanes: split opportunities (oversize vs tier-calibrated Anthropic-prescribed caps…
quiz-me
Post-work comprehension check: after a change is complete, generate a self-contained HTML report of what was done (context, intuition, decisions) with a quiz at the bottom that you answer. Verifying the HUMAN absorbed the work, not the artifact. Non-gating by default; the quizpolicy userConfig tunes offer cadence.…
firecrawl
Scrape, search, crawl, map, parse, or interact with web pages via the firecrawl-cli binary, writing results to disk instead of streaming them into context. Actions: scrape, search, crawl, map, parse, interact, agent, monitor, search-feedback, credit-usage. Use when: 'scrape this page', 'crawl this site', 'search the…
changelog
Ingest Claude Code changelog entries and integrate them into the current repo. Fetch (read-only display), diff (impact analysis, no edits), status (applied versions), and apply (full integrate pipeline, explicit user intent only). Use when: 'new cc version', 'what changed in claude code', 'apply changelog', a new CC…