Agent-Skills.md

Agent Skills: Context Master

Universal context management and planning system. PROACTIVELY activate for: (1) ANY complex task requiring planning, (2) Multi-file projects/websites/apps, (3) Architecture decisions, (4) Research tasks, (5) Refactoring, (6) Long coding sessions, (7) Tasks with 3+ sequential steps. Provides: optimal file creation order, context-efficient workflows, extended thinking delegation (23x context efficiency), passive deep analysis architecture, progressive task decomposition, and prevents redundant work. Saves 62% context on average. Essential for maintaining session performance and analytical depth.

UncategorizedID: josiahsiegel/claude-plugin-marketplace/context-master

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josiahsiegel/claude-plugin-marketplace
JosiahSiegelLicense: MIT
213

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pnpm dlx add-skill https://github.com/JosiahSiegel/claude-plugin-marketplace/tree/HEAD/plugins/context-master/skills/context-master

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plugins/context-master/skills/context-master/SKILL.md

Skill Metadata

Name
context-master
Description
|

Context Master

Universal context management and planning skill for complex tasks, long sessions, and multi-file projects. Works the same way whether you are in the Web app, the API, or Claude Code CLI; CLI-specific bonuses live in references/claude-code-cli.md.

This SKILL.md is intentionally short. Detailed material lives in references/ — load only what you need.

When to activate

Activate proactively whenever the request matches one of:

  • Multi-file project (3+ related files, websites, apps, APIs, doc sets).
  • Architecture or technology decision ("should we use X or Y", "which approach…").
  • Research / comparison / tradeoff analysis.
  • Refactoring or migration work.
  • Long coding session where context efficiency matters.
  • Any task with 3+ sequential steps or shared dependencies.

If the request is a single file with no dependencies, skip this skill.

The 5-step workflow (memorize this)

For any multi-file project — websites, apps, APIs, documentation sets — run these five steps in order:

  1. STOP — do not create any files yet.
  2. PLAN — use extended thinking or a planning document (both equally valid; see references/multi-file-planning.md).
  3. ANNOUNCE — state the file list and creation order to the user.
  4. CREATE — write files in optimal order (foundations before dependents).
  5. VERIFY — check that every reference resolves; fix issues before declaring done.

Worked example (portfolio website)

User: "Create a portfolio with home, about, projects, and contact pages."

Step 1 STOP    -- do not start with index.html.
Step 2 PLAN    -- "Think hard about architecture: 5 files needed,
                  styles.css is the shared dependency."
Step 3 ANNOUNCE -- "I'll create:
                  1. styles.css       (shared styling)
                  2. index.html       (references styles.css)
                  3. about.html
                  4. projects.html
                  5. contact.html"
Step 4 CREATE   -- write files in that order.
Step 5 VERIFY   -- every HTML file links styles.css; navigation resolves.

Result: no refactor, no re-export, no broken links.

The full template, optimal-order patterns by project type (website / React / backend API / etc.), and verification checklists are in references/multi-file-planning.md.

Core principles (one line each)

  1. Plan before you write — extended thinking or planning doc, never both skipped.
  2. Foundations first — shared dependencies (CSS, config, base classes, schemas) precede dependents.
  3. Delegate deep analysis to isolated contexts — subagents (CLI) or thinking artifacts (Web/API) keep the main thread clean.
  4. Phase boundaries — name each phase ("Phase 1 complete; moving to Phase 2: …") so context doesn't blur.
  5. Artifacts over inline content — long code or docs live in artifacts/files, not chat history.
  6. Progressive disclosure — ask for one slice at a time; don't batch unrelated steps.
  7. Signal resets — say "setting aside the previous approach…" when changing direction.
  8. Reflect after large projects — was it planned? Did references break? Use the post-project checklist in references/multi-file-planning.md.

Full rationale and examples for every principle: references/universal-best-practices.md.

Token-savings rule of thumb

| Project size | Without planning | With planning | Savings | |---|---|---|---| | Small (3-4 files) | ~6,000 tokens | ~2,500 tokens | ~58% | | Medium (7-8 files) | ~12,000 tokens | ~4,500 tokens | ~63% | | Large (20+ files) | ~35,000 tokens | ~12,000 tokens | ~66% |

A 200K-token context window holds roughly 16-17 medium projects with planning, 7-8 without — a 2.1x effective increase. Numbers and methodology in references/multi-file-planning.md.

Passive deep-thinking architecture

The single most powerful pattern for context efficiency: route deep reasoning into an isolated space and return a short summary to the main thread.

  • Claude Code CLI: /agent deep-analyzer "Ultrathink about [decision]" — ~5K tokens of reasoning happens out-of-band; main context receives a ~200-token summary (~23x efficiency).
  • Web / API: "Create a deep-analysis artifact and ultrathink about [decision]" — same idea, artifact instead of subagent.

Triggers, anti-patterns, and ready-made prompts: references/thinking-delegation.md.

Common workflows (pointers only)

Each of these has a step-by-step procedure in references/workflows.md:

  • Workflow 0 — Multi-file website/project creation (the default — same 5 steps above with extra detail).
  • Workflow 1 — Complex decision-making (architecture, tech choice).
  • Workflow 2 — Complex feature development (analysis → design → implement → test → integrate).
  • Workflow 3 — Research and technology evaluation.
  • Workflow 4 — Code generation and iteration via artifacts.
  • Workflow 5 — Refactoring with isolated analysis.

Anti-patterns (avoid these)

Quick list — examples and fixes in references/anti-patterns.md:

  1. Creating files before planning — wastes context on refactors.
  2. Asking for everything at once — overloads context and produces shallow output.
  3. Inlining long code/docs in chat — bloats history; use artifacts/files.
  4. Letting deep reasoning happen in main thread — costs ~5K tokens that could be ~200.
  5. No phase boundaries — context blurs across unrelated subtasks.

Troubleshooting

When sessions drift (responses unfocused, conversations getting too long, code regenerating instead of editing, extended thinking not engaging), see references/troubleshooting.md for a symptom → remedy table covering Web/API and CLI separately.

Claude Code CLI bonuses

If you are running in Claude Code CLI, you also get:

  • /clear, /compact, /continue — built-in context controls.
  • /agent <name> — delegate to an isolated subagent.
  • CLAUDE.md — persistent project memory.
  • Helper scripts for generating CLAUDE.md and subagent definitions.

Details, script invocations, and the deep-analysis delegation patterns: references/claude-code-cli.md.

Skill–subagent integration patterns (when both are available) live in references/agent-skills-integration-2025.md. Long-form context strategies and subagent prompt patterns: references/context_strategies.md and references/subagent_patterns.md.

Reference map

| File | Use when | |---|---| | references/multi-file-planning.md | Planning template, optimal-order patterns by project type, verification checklists, post-project reflection. | | references/universal-best-practices.md | Need the rationale or examples for any of the 8 core principles. | | references/workflows.md | Need a step-by-step procedure for a specific scenario (decision, feature, research, refactor). | | references/thinking-delegation.md | Designing a deep-analysis delegation or writing the thinking prompt. | | references/anti-patterns.md | Reviewing whether the current approach is wasting context. | | references/troubleshooting.md | Session is drifting, slow, or producing too much explanation. | | references/claude-code-cli.md | Running in Claude Code CLI and want subagent / CLAUDE.md tooling. | | references/agent-skills-integration-2025.md | Combining skills with subagents in CLI. | | references/context_strategies.md | Long-form strategy notes. | | references/subagent_patterns.md | Subagent prompt patterns. |

Success indicators

  • You announced the plan before creating any file.
  • Foundation files (CSS, config, schemas) were written before dependents.
  • No reference broke on first run; no refactor was needed.
  • Deep reasoning happened in a subagent or artifact, not the main thread.
  • Phases were named as you crossed them.

If any of those failed, walk back through references/anti-patterns.md and references/multi-file-planning.md post-project section before the next task.

Context Master Skill | Agent Skills