Context Budget

---
name: context-budget
description: Use to audit token consumption across always-loaded guidance — agents, skills, MCP servers, CLAUDE.md / AGENTS.md, rules, hooks and config — in Claude Code or Codex. Identifies bloat, redundancy and duplicate skill roots, and produces optimization recommendations. Meta-maintenance skill.
---

# Context Budget

## The Rule

Every always-loaded component costs tokens on every request; measure before cutting.

Agent descriptions load every time. MCP tools cost ~500 tokens each. Skills load on invocation. Bloat accumulates silently.

## When to Use

- System feels slow, noisy, harder to steer, or hitting context limits
- Before adding new agents/skills/MCP servers
- Periodic maintenance (monthly)
- After major system changes

## Process

### Phase 1: Inventory

Scan and estimate token cost for each component. Audit the harness you are running in — the columns differ, the method does not:

| Component | How to estimate | Claude Code | Codex |
|---|---|---|---|
| **Agents** | `words × 1.3` | `.claude/agents/*.md` (project) + `~/.claude/agents/*.md` (user) | `~/.codex/agents/*.toml` |
| **Skills** | `words × 1.3` (SKILL.md only — extra files load on demand) | `~/.claude/skills/*/SKILL.md` | `~/.codex/skills/*/SKILL.md` + `~/.agents/skills/*/SKILL.md` |
| **Instructions** | `words × 1.3` | all `CLAUDE.md` files | all `AGENTS.md` files |
| **Rules** | `words × 1.3` | `~/.claude/rules/**/*.md` | already folded into `~/.codex/AGENTS.md` |
| **MCP servers** | `~500 tokens per tool` | `/mcp` or `settings.json` | `[mcp_servers.*]` in `~/.codex/config.toml` |
| **Hooks / config** | read once, always on | `settings.json` hooks | `~/.codex/hooks.json`, `config.toml` |

```bash
# Quick word count for all agents
wc -w ~/.claude/agents/*.md          # Claude Code
wc -w ~/.codex/agents/*.toml         # Codex

# Quick word count for all skills (both roots — Codex reads ~/.agents/skills natively)
find ~/.claude/skills ~/.agents/skills -name "SKILL.md" -exec wc -w {} +

# Count MCP tools loaded
# Claude Code: /context · Codex: /status
```

### Phase 2: Classify

| Category | Criteria | Action |
|---|---|---|
| **Always needed** | Used every session | Keep |
| **Sometimes needed** | Used weekly | Consider on-demand |
| **Rarely needed** | Used monthly or less | Remove or lazy-load |

### Phase 3: Detect Issues

Flag these patterns:

| Issue | Threshold | Fix |
|---|---|---|
| **Bloated agent description** | >30 words in frontmatter `description` | Shorten — description is for routing, not docs |
| **Heavy agent** | >200 lines | Move details to skill or reference doc |
| **Heavy skill** | >150 lines | Condense or split into SKILL.md + reference files |
| **MCP over-subscription** | >10 servers loaded | Disable unused servers |
| **Instructions bloat** | `CLAUDE.md` / `AGENTS.md` >200 lines | Split into focused rules files |
| **Redundant components** | Agent + skill overlap | Merge or clarify boundaries |
| **Duplicate skill roots** | Same skill name in two roots (e.g. `~/.codex/skills` and `~/.agents/skills`) | Keep one source, symlink the other — see `~/.claude/scripts/sync-agents-skills.sh` |
| **Unused components** | Never referenced in flows | Remove |

### Phase 4: Report

```text
[CONTEXT BUDGET AUDIT]

Total estimated overhead: {n} tokens

| Component    | Count | Tokens | % |
|--------------|-------|--------|---|
| Agents       | {n}   | {n}    | % |
| Skills       | {n}   | {n}    | % |
| Instructions | {n}   | {n}    | % |
| MCP tools    | {n}   | {n}    | % |
| Rules        | {n}   | {n}    | % |

Issues found: {n}
1. {issue} — {component} — Save: ~{n} tokens
2. {issue} — {component} — Save: ~{n} tokens

Top 3 recommendations:
1. {action} — saves ~{n} tokens
2. {action} — saves ~{n} tokens
3. {action} — saves ~{n} tokens

Capacity: {remaining}% free after overhead
```

## Key Insights

- **MCP is the biggest lever** — each tool schema ~500 tokens. 10 servers × 5 tools = 25,000 tokens
- **Agent descriptions load always** — even if agent never runs. Keep short.
- **Skill SKILL.md loads on invocation** — extra files in skill folder load only when read
- **Instructions load always** — `CLAUDE.md` / `AGENTS.md`: every token counts

## Enforcement

- **ALWAYS** include token estimates with evidence
- **ALWAYS** produce actionable, file-based recommendations
- **PREFER** deletion over rewriting when a component adds no clear value
- **NEVER** recommend removing components without checking if they're referenced