write-agentmemory-skill

A writing guide for creating or updating skills used by agentmemory. It defines the required file structure, description format, section order, and size limits.

In plain words
What is it for?
Use it when adding, restructuring, or reviewing an agentmemory skill, including its main instructions, examples, references, and cross-links.
Why use it?
It keeps related skills consistent, easy for agents to load, and clear for contributors to maintain.

Skill for Claude CodeCodex

Part of the agentmemory plugin — 15 skills, 2 commands, 12 hooks, 1 MCP server shipped together

Install

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.

agentmods
npx agentmods add skills/rmarquesa/agentmemory-offline/write-agentmemory-skill
Any agent
npx skills add rmarquesa/agentmemory-offline --skill write-agentmemory-skill
Clone the repo
git clone --depth 1 https://github.com/rmarquesa/agentmemory-offline

Made for: Claude Code, Codex.

Or install agentmemory, the plugin that ships this one along with the rest of its 15 skills, 2 commands, 12 hooks, 1 MCP server.

Per session 40 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 510 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin 100% copy Near-identical to another mod in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5 $0.00040 $0.00510
Opus 5 $0.00020 $0.00255
Sonnet 5 $0.00008 $0.00102
Haiku 4.5 $0.00004 $0.00051

Measured 2d ago against content hash 07f5e9973c86, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

write-agentmemory-skill 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 2d 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.

Origin

This is a copy

100% identical to write-agentmemory-skill — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

plugin/skills/write-agentmemory-skill/SKILL.md · 41 lines

How it starts

The opening of the file, as written. The whole thing — 41 lines — stays where its author put it; the contents beside it link to each section on GitHub.

agentmemory skills follow one tiered format so they stay skimmable, accurate, and current. Match it exactly.

Directory layout

plugin/skills/<name>/
  SKILL.md      (required, under 100 lines)
  REFERENCE.md  (optional, dense facts; auto-generate data tables)
  EXAMPLES.md   (optional, worked transcripts)

SKILL.md rules

  • Frontmatter: name, description, optional argument-hint, and user-invocable. Set user-invocable: true only for skills the user runs as a slash command; reference and knowledge skills are false.
  • Description is two sentences and the only thing the agent sees when deciding to load the skill. Sentence one states the capability. Sentence two starts "Use when" and lists concrete triggers. Keep it distinct from sibling skills, under 1024 chars, third person.
  • Body order: Quick start (one concrete example), Why (the governing principle), Workflow (numbered steps with decision gates), Anti-patterns (a WRONG vs RIGHT callout for the top mistake), Checklist, See also (cross-link siblings), Reference or Troubleshooting pointer.
  • Stay under 100 lines. Move dense facts to REFERENCE.md and examples to EXAMPLES.md.
  • Cross-references link one level deep only. Shared recovery steps live in ../_shared/TROUBLESHOOTING.md, never inlined.

Keep it current

Facts that exist in source (tool names and parameters, REST endpoints, env vars, connect adapters, hook events) are generated, never hand-typed. Edit the source, then run npm run skills:gen. CI runs npm run skills:check and fails on drift, so generated tables cannot fall behind the code.

Style

No external or competitor product names. No emojis. No em-dashes. No filler. State the thing and stop.

Checklist

  • Description has a "Use when" sentence with real triggers.
  • SKILL.md is under 100 lines.
  • No time-sensitive claims and no duplicated troubleshooting block.
  • Concrete example present; generated facts come from the generator.
  • Cross-links resolve and go one level deep.

Read the full file on GitHub · 41 lines

Changes

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.

  1. 2d ago First seen · 41 lines · 40 tokens per session scan A 07f5e9973c86

Subscribe to this mod's changes

write-agentmemory-skill is a skill published in the GitHub repository rmarquesa/agentmemory-offline (0 stars, last pushed 2d ago), licensed Apache-2.0. It adds 40 tokens to every session and 510 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to write-agentmemory-skill, differing in 0 lines, and is treated as a copy.