Agent Skills for Context Engineering is a collection of reusable instructions that teach AI agents how to manage their context, coordinate multi-agent systems, and evaluate behavior. Developers use it when building or debugging production agent systems, and the catalogue entries are skills, agents, instructions, and a plugin from this collection.
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 muratcankoylan/Agent-Skills-for-Context-Engineering --skill digital-brain-skillgit clone --depth 1 https://github.com/muratcankoylan/Agent-Skills-for-Context-EngineeringWrote 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/muratcankoylan/agent-skills-for-context-engineering/digital-brain-skill)<a href="https://agentmods.dev/skills/muratcankoylan/agent-skills-for-context-engineering/digital-brain-skill"><img src="https://agentmods.dev/badge/skills/muratcankoylan/agent-skills-for-context-engineering/digital-brain-skill/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/muratcankoylan/agent-skills-for-context-engineering/digital-brain-skill"><img src="https://agentmods.dev/badge/skills/muratcankoylan/agent-skills-for-context-engineering/digital-brain-skill.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00041 | $0.01651 |
| Opus 5 | $0.00020 | $0.00826 |
| Sonnet 5 | $0.00008 | $0.00330 |
| Haiku 4.5 | $0.00004 | $0.00165 |
Grade A, and why
digital-brain 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 — 204 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Digital Brain
A structured personal operating system for managing digital presence, knowledge, relationships, and goals with AI assistance. Designed for founders building in public, content creators growing their audience, and tech-savvy professionals seeking AI-assisted personal management.
Important: This skill uses progressive disclosure. Module-specific instructions are in each subdirectory's .md file. Only load what's needed for the current task.
When to Activate
Activate this skill when the user:
- Requests content creation (posts, threads, newsletters) - load identity/voice.md first
- Asks for help with personal brand or positioning
- Needs to look up or manage contacts/relationships
- Wants to capture or develop content ideas
- Requests meeting preparation or follow-up
- Asks for weekly reviews or goal tracking
- Needs to save or retrieve bookmarked resources
- Wants to organize research or learning materials
Trigger phrases: "write a post", "my voice", "content ideas", "who is [name]", "prepare for meeting", "weekly review", "save this", "my goals"
Core Concepts
Progressive Disclosure Architecture
The Digital Brain follows a three-level loading pattern:
| Level | When Loaded | Content |
|---|---|---|
| L1: Metadata | Always | This SKILL.md overview |
| L2: Module Instructions | On-demand | [module]/[MODULE].md files |
| L3: Data Files | As-needed | .jsonl, .yaml, .md data |
File Format Strategy
Formats chosen for optimal agent parsing:
- JSONL (
.jsonl): Append-only logs - ideas, posts, contacts, interactions - YAML (
.yaml): Structured configs - goals, values, circles - Markdown (
.md): Narrative content - voice, brand, calendar, todos - XML (
.xml): Complex prompts - content generation templates
Append-Only Data Integrity
JSONL files are append-only. Never delete entries:
- Mark as
"status": "archived"instead of deleting - Preserves history for pattern analysis
- Enables "what worked" retrospectives
What ships with it
46 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.
- .gitignore 442 B
- AGENT.md 1.5 KB
- agents/AGENTS.md 2.5 KB
- agents/scripts/content_ideas.py 4.2 KB runs code
- agents/scripts/idea_to_draft.py 4.1 KB runs code
- agents/scripts/stale_contacts.py 3.8 KB runs code
- agents/scripts/weekly_review.py 3.1 KB runs code
- content/calendar.md 2.0 KB
- content/CONTENT.md 2.2 KB
- content/engagement.jsonl 663 B
- content/ideas.jsonl 486 B
- content/posts.jsonl 627 B
- content/templates/linkedin-post.md 1.6 KB
- content/templates/newsletter.md 1.5 KB
- content/templates/thread.md 1.1 KB
- examples/content-workflow.md 4.4 KB
- examples/meeting-prep.md 5.6 KB
- HOW-SKILLS-BUILT-THIS.md 13 KB
- identity/bio-variants.md 1.7 KB
- identity/brand.md 3.6 KB
- identity/IDENTITY.md 1.4 KB
- identity/prompts/content-generation.xml 1.4 KB
- identity/prompts/reply-generator.xml 1.3 KB
- identity/values.yaml 1.9 KB
- identity/voice.md 3.3 KB
- knowledge/bookmarks.jsonl 559 B
- knowledge/competitors.md 2.2 KB
- knowledge/KNOWLEDGE.md 2.4 KB
- knowledge/learning.yaml 2.1 KB
- knowledge/research/_template.md 1.3 KB
- network/circles.yaml 2.0 KB
- network/contacts.jsonl 897 B
- network/interactions.jsonl 454 B
- network/intros.md 2.1 KB
- network/NETWORK.md 3.0 KB
- operations/goals.yaml 2.1 KB
- operations/meetings.jsonl 635 B
- operations/metrics.jsonl 707 B
- operations/OPERATIONS.md 2.0 KB
- operations/reviews/_weekly_template.md 1.7 KB
- operations/todos.md 1.3 KB
- package.json 1.3 KB
- README.md 7.2 KB
- references/file-formats.md 7.3 KB
- scripts/install.sh 1.9 KB runs code
- SKILLS-MAPPING.md 8.6 KB
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 · 204 lines · 41 tokens per session scan A e66ece9e2b0f
digital-brain is a skill published in the GitHub repository muratcankoylan/Agent-Skills-for-Context-Engineering (17,954 stars, last pushed 22d ago), licensed MIT. It adds 41 tokens to every session and 1,651 once invoked, about $0.0002 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 2026-08-30.
Other skills, from other repositories
Cortex
Operate Cortex, the LifeOS memory system — the typed Knowledge Archive (People, Companies, Ideas, Research with typed related: links) plus recall of prior work sessions, ISAs, and conversations. Search, add, harvest, develop, ingest, distill, graph-navigate, recall. USE WHEN cortex, knowledge, knowledge base, search…
Migrate
Intakes external content, classifies chunks against LifeOS taxonomy, commits with provenance. Sources: .md/.txt, stdin, LifeOS dirs, CLAUDE.md/Cursor/OpenAI Custom Instructions, Obsidian/Notion/Apple Notes exports. MigrateScan classifies → routing table. MigrateApprove with…
daily-briefing
Proactive daily briefing that fires on a recurring schedule, pulls recent memory and workspace context, composes a structured summary (action items, progress, radar, next steps), and delivers it to all active channels. Enable with a time like "set up my daily briefing at 9am". Disable, reschedule, or check status at…
company-brain
Your team's shared, AI-ready knowledge base — people, companies, meetings, SOPs, and decisions structured so Claude can answer questions on your team's behalf. Team-scope sibling to second-brain (which is personal-scope). Seven modes — capture (drop something into the right structured dir), compile (process into wiki…
calendar
Manage calendar events via CalDAV (Google/iCloud/Nextcloud) or local ICS files. View, create, and query events.
email-assistant
Read, search, draft, and send emails via Himalaya CLI or Python IMAP/SMTP. Requires email account configuration.