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 sammcj/agentic-coding --skill markeditgit clone --depth 1 https://github.com/sammcj/agentic-codingWrote 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/sammcj/agentic-coding/markedit)<a href="https://agentmods.dev/skills/sammcj/agentic-coding/markedit"><img src="https://agentmods.dev/badge/skills/sammcj/agentic-coding/markedit/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/sammcj/agentic-coding/markedit"><img src="https://agentmods.dev/badge/skills/sammcj/agentic-coding/markedit.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 2 findings, up to high
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 →
- high Rogue Agent · line 94 Skill modifies its own code, configuration, or behavior at runtime. Self-modification enables an agent to escalate privileges, disable safety constraints, or install persistent backdoors.Fix: Prevent the skill from modifying its own code, SKILL.md, or configuration files. Treat skill files as read-only at runtime.
- medium Data Exfiltration · line 49 Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
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 | $0.00016 | $0.01361 |
| Opus 5.5 | $0.00006 | $0.00544 |
| Sonnet 5.5 | $0.00003 | $0.00272 |
| Haiku 4.5 | $0.00002 | $0.00136 |
Grade A, and why
markedit-tools 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 1mo 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 — 158 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Purpose
Help users configure and extend MarkEdit, a free and open-source markdown editor for macOS.
Key Capabilities
- Upgrade the MarkEdit app
- Install, upgrade, and manage MarkEdit extensions
- Configure MarkEdit advanced settings
- Answer questions related to MarkEdit
Core Concepts
File Locations
| Path | Description |
|---|---|
~/Library/Containers/app.cyan.markedit/Data/Documents/scripts/ |
Extensions directory |
~/Library/Containers/app.cyan.markedit/Data/Documents/settings.json |
Advanced settings |
~/Library/Containers/app.cyan.markedit/Data/Documents/editor.css |
Custom stylesheets |
~/Library/Containers/app.cyan.markedit/Data/Documents/editor.js |
Custom JavaScript |
Extension URLs
When a user provides an extension name, download from this URL pattern:
https://github.com/MarkEdit-app/extension-name/blob/main/dist/extension-name-kebab-cased.js?raw=true
Always normalise the extension name to kebab-case.
For example, MarkEdit Preview is available at:
https://github.com/MarkEdit-app/MarkEdit-preview/blob/main/dist/markedit-preview.js?raw=true
When a user requests a "lite" build, it is located in the lite subfolder under dist:
https://github.com/MarkEdit-app/MarkEdit-preview/blob/main/dist/lite/markedit-preview.js?raw=true
The filename is identical to the standard build; do not add a -lite suffix.
If the dist file is not found (non-200 response), fall back to the GitHub latest release asset:
- Fetch the latest release tag from the GitHub API:
https://api.github.com/repos/MarkEdit-app/extension-name/releases/latest - Read the
tag_namefield from the response. - Download the asset using:
https://github.com/MarkEdit-app/extension-name/releases/download/{tag_name}/extension-name-kebab-cased.js
For example, if dist/markedit-preview.js is not available in the repository and the latest release tag is v1.0.0:
https://github.com/MarkEdit-app/MarkEdit-preview/releases/download/v1.0.0/markedit-preview.js
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.
- 1mo ago First seen · 158 lines · 16 tokens per session scan A d9a086b71414
markedit-tools is a skill published in the GitHub repository sammcj/agentic-coding (165 stars, last pushed today), licensed Apache-2.0. It adds 16 tokens to every session and 1,361 once invoked, about $0.0001 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 2026-09-03.
Other skills, from other repositories
pb-supervise-parallel-mission
Run N parallel worker agents on disjoint file/topic ownership and fan their results into one verified deliverable. Trigger when supervising - 'I am the supervisor', 'spawn parallel workers', 'fan-in several agents', 'decompose this mission and delegate'.
ap-cron
Schedule recurring or one-shot jobs on the agentproto daemon — croncreate with command, agent, or prompt-session actions, cronlist to inspect, cronrun to test-fire, crondelete to remove. Trigger when asked for cron jobs, scheduled agent runs, nightly check-ins, one-shot timers, or durable session re-pings.
ap-terminal
Open a real PTY terminal session through agentproto to drive interactive TUIs (vim, htop, an interactive CLI wizard, a nested claude TUI) with live keystrokes and byte-buffered output. Trigger phrases include "open a terminal", "start a PTY session", "type into the interactive prompt", "attach a terminal panel", "send…
pb-boss-checkins
Stay accountable on a long mission by scheduling a cron boss that re-prompts your own session on a fixed local-time schedule. Trigger for durable check-ins - 'cron a status report', 'wake me on a schedule', 're-prompt my session periodically', 'mission check-in boss'.
pb-new-agent-session
Spawn one worker agent on the agentproto daemon, drive it with a brief and follow-ups to a verified result, then tear it down cleanly. Trigger when delegating a single task - 'spawn an agent', 'delegate this to a worker', 'run an agent to completion', 'drive an agent session'.
session-steward
Wrap up idle agentproto agent sessions — classify them, close the safe ones, judge the ambiguous ones. Use when the user says "clean up idle sessions", "run the steward", "close finished sessions", or asks which sessions are still needed. Dry run by default; closing (--apply) mutates daemon state.