macu - Minimize AI Credit Usage

My story

I was paying for Claude Code and burning through my 5-hour limit in just 1.5 hours.

I'd open a new session, send a few messages, ask Claude to help me with one task - and somehow I was already at 40% of my window. It didn't match the work I was actually doing.

So I asked Claude to figure out what was happening. It pulled 50 days of usage data - 830 sessions, 33,000 tool calls - and broke down the token cost of every single message I sent.

That's when I saw it. Every message was carrying 95 MCP tool definitions in the request body. Linear. Slack. LSP. Custom plugins I'd installed months ago and forgotten. All 95 of them, loaded fresh into the context on every single request.

But when I counted what I actually used? 35 tools. The other 60 were dead weight - adding ~9,000 tokens of overhead to every message before I even typed a word.

That was 32% of my input budget, gone, forever, on tools I never called.

Over the full 50 days that came out to roughly 465 million wasted tokens. On one account.

If I had been paying API rates for that overhead, the bill would have been:

• ~$1,395 at Claude Sonnet input pricing ($3 / million tokens)
• ~$6,975 at Claude Opus input pricing ($15 / million tokens)

On a subscription it doesn't hit your credit card directly - but it IS the reason your plan's window feels smaller than it should. You're shipping $1,000+ of worthless tool definitions inside every plan cycle.

Why not just compress the output?

Before building macu I tried the tools that already existed - rtk, LLMLingua, Repomix, and a few prompt-compression approaches. They all work by compressing or truncating what comes back from tool calls: shorter git diff output, summarized test results, stripped file contents.

The problem is they remove context the AI actually needs:

• git diff gets truncated to 31 lines per file. The agent can't see the full change, so it re-fetches the same diff 3 times. The retries cost more tokens than the original output.
• cat / read in "aggressive" mode strips function bodies and keeps signatures only. The agent can't debug implementation details it can no longer see.
• Test output shows "failures only." The agent can't tell which tests already exist when writing a new one.
• Debugging workflows lose variable states, imports, and adjacent logic. The agent guesses instead of reasons.

These tools reduce token count. But they also reduce the signal the model needs to do its job. You save tokens on every call and lose quality on every answer. For some workflows (clean git push, simple ls) the tradeoff is fine. For debugging, code review, or anything where context matters - it hurts.

I realized the actual waste wasn't in what tools return. It was in what tools load. Those 60 unused tool definitions ship in every single message whether you call them or not. Removing them saves tokens without removing a single byte of context the AI would ever use.

So I built macu to find that waste and make it easy to clean up - without touching anything the AI needs to see.

What macu does

It reads your actual tool-call history from Claude Code, OpenCode, or Codex - then shows you:

• Which tools you actually use (the 35 that earn their keep)
• Which tools are silent overhead (the 60 costing you money for nothing)
• A copy-pasteable action plan your AI agent can execute in the same session

Same AI. Same workflow. Just without the dead weight in every request.

Who should use it

• You use Claude Code, OpenCode, or Codex
• You've installed MCP servers or plugins over time (Linear, Slack, GitHub, LSP, custom ones)
• You feel like you hit rate limits faster than the work you're doing justifies

If you have zero MCP plugins installed, this tool has nothing to find.

What you'll see

Run macu and it prints the whole picture in one pass. This is real output from my own setup (120 tools, 88 days, ~52k messages):

Summary:

  Source    OpenCode, Claude Code, Codex
  Period    Jan 22, 2026 - Apr 19, 2026 (88 days)
  Sessions  2,223
  Messages  51,964
  Tool calls  92,218 across 120 unique tools

Most used tools (the ones earning their keep):

  read                      ████████████████████████████████████████   25,933 (28.1%)
  bash                      ██████████████████████████████░░░░░░░░░░   19,266 (20.9%)
  edit                      █████████████░░░░░░░░░░░░░░░░░░░░░░░░░░░    8,421 (9.1%)
  grep                      ████████████░░░░░░░░░░░░░░░░░░░░░░░░░░░░    7,682 (8.3%)
  todowrite                 ███████░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░    4,353 (4.7%)
  glob                      █████░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░    3,415 (3.7%)
  ... 114 more tools

Unused & rarely used (with confidence badges driven by idle-days):

  54 tools with <13 calls:
    • linear-granthelp_list_users         (6 calls) [high (cold, 26d idle)]
    • linear-granthelp_get_my_issues      (6 calls) [LOW (recent, 5d idle)]
    • linear-granthelp_get_user           (2 calls) [high (very cold, 37d idle)]
    • mcp__mcp-dblp__add_bibtex_entry     (8 calls) [high (cold, 30d idle)]
    • update_plan                         (5 calls) [high (very cold, 87d idle)]
    • ... and 49 more

Confidence comes from idle-days, not call count. A tool called 6 times 4 days ago is riskier to disable than a tool called 6 times 30 days ago - macu surfaces that directly so you (or your agent) don't disable something you'll miss tomorrow.

Projected token overhead (what this is costing you per message):

  Now       ████████████████████████████████████████  36,000 tok - 120 tools loaded
  Optimized ██████████████████████░░░░░░░░░░░░░░░░░░  19,800 tok -  66 tools loaded

  → Estimated savings: ~16,200 tokens per message (45% reduction)

  Applied retroactively to your 51,964 messages over 88 days,
  this would have saved roughly 841.9M tokens.

Action plan - grouped by config file, with server health, Conservative/Aggressive tiers, and the exact JSON to merge:

  1. Deny specific MCP tools in opencode.json
     → Edit ~/.config/opencode/opencode.json
     Server "linear-granthelp" · 594 total calls · 9/15 active

     ▸ Conservative (safe: high-confidence only)
       Saves ~1,500 tokens/message (5 tools)
       {
         "tools": {
           "linear-granthelp_get_user": false,
           "linear-granthelp_list_issue_statuses": false,
           "linear-granthelp_list_projects": false,
           "linear-granthelp_list_users": false,
           "linear-granthelp_save_comment": false
         }
       }

     ▸ Aggressive (include recent / medium-confidence flags)
       Saves ~1,800 tokens/message (6 tools)
       { ... 5 above + "linear-granthelp_get_my_issues": false }

     Covers 6 tools, 22 calls:
       • linear-granthelp_list_users     (6 calls) [high (cold, 26d idle)]
       • linear-granthelp_get_my_issues  (6 calls) [LOW (recent, 5d idle)]
       ...

  2. Deny Claude Code plugin MCP in settings.json
     → Edit ~/.claude/settings.json
     Server "oh-my-claudecode" · 180 total calls · 5/13 active

     ⚠ this removal format disables the whole server. Tiering does not apply -
       accepting this snippet also disables recently-used tools in the same server.

     Saves ~2,400 tokens/message (8 tools)
       { "permissions": { "deny": ["mcp__oh-my-claudecode__*"] } }

  3. Disable plugin tools via oh-my-openagent.json
     → Edit ~/.config/opencode/oh-my-openagent.json

     ▸ Conservative ... ▸ Aggressive ...

  4. Historical data (no action needed)
     • "linear-sw"  - 4 tools, 20 historical calls
     • "mcp-dblp"   - 4 tools, 16 historical calls

  5. Verify: run macu again after cleanup

  Expected: 117 → 69 tools, ~14,400 tokens saved per message (41%)

Each action carries three pieces of context an agent can judge at a glance:

1. Server health - "594 total calls · 9/15 active" tells you the server is healthy and the flagged tools are a minority. If it said "all tools unused", you'd just disable the whole server.
2. Confidence tiers - Conservative drops only tools that have been idle long enough to be safe. Aggressive adds the rest. Whole-server wildcard denies skip tiering because the snippet is the same either way.
3. Exact JSON - merge-ready snippets for opencode.json, oh-my-openagent.json, or ~/.claude/settings.json.

When run in an interactive terminal, macu also offers to copy a ready-to-paste optimization prompt to your clipboard so you can hand it straight to your AI agent.

Double-check and backup step

Before any config gets edited, macu does two things so you can always reverse course.

Double-check: where each tool actually lives

Every flagged tool is traced back to the config file that actually declares it. macu knows the difference between:

• A direct MCP entry in opencode.json (disable via mcp.<name>.enabled: false)
• A plugin-native tool from oh-my-openagent (disable via disabled_tools in oh-my-openagent.json)
• A Claude Code plugin MCP (disable via permissions.deny in ~/.claude/settings.json)
• A host-native tool that no config can disable (ignored)
• A historical tool whose server is already gone (reported, no action needed)

If macu can't find where a tool lives, it labels it removed or unknown and refuses to emit a disable snippet. You never get "disable this" instructions for a tool it doesn't understand.

Each actionable group also offers Conservative and Aggressive tiers. Each tool carries its own confidence label so you can eyeball the risk: [high (cold, 26d idle)] vs [LOW (recent, 5d idle)]. Pick the tier that matches your preference, or cherry-pick individual entries from the JSON snippet.

Backup: so you can wire them back anytime

When an AI agent applies macu's recommendations following the installation guide, the flow is:

1. Back up each config file to <file>.bak-<timestamp> before any edit
2. Apply the approved changes
3. Verify the result parses as valid JSON
4. Re-run macu to confirm the expected tool count drop

The .bak-<timestamp> file sits right next to the original. If you later decide you want a disabled tool back, just open the backup, copy the entry you removed, and merge it back into the live config. No commitment, fully reversible.

Installation

For LLM Agents

Paste this to your agent (Claude Code, OpenCode, etc.):

Install macu and run it to optimize my tool usage. Follow the guide:
https://raw.githubusercontent.com/minhvoio/macu_minimize-ai-credit-usage/main/docs/guide/installation.md

Or fetch the guide directly:

curl -s https://raw.githubusercontent.com/minhvoio/macu_minimize-ai-credit-usage/main/docs/guide/installation.md

For Humans

curl -fsSL https://raw.githubusercontent.com/minhvoio/macu_minimize-ai-credit-usage/main/install.sh | bash

Or install directly:

npm install -g @minagents/macu

Or run once without installing:

npx @minagents/macu

The installer will ask if you also want the companion tool ai-usage-monitors (cu / cou for live subscription usage bars). Skip the prompt:

# Install macu only (no prompt)
curl -fsSL https://raw.githubusercontent.com/minhvoio/macu_minimize-ai-credit-usage/main/install.sh | bash -s -- --no-companion

# Install both at once (no prompt)
curl -fsSL https://raw.githubusercontent.com/minhvoio/macu_minimize-ai-credit-usage/main/install.sh | bash -s -- --yes

Note: macu is designed to run inside an AI coding session. You can run it from your terminal to see the analysis, but the optimization step (editing configs, removing MCP servers) is meant to be executed by your AI agent. If you ran macu outside a session, paste the output to your agent and ask it to apply the action plan.

Usage

Run this inside your AI agent session:

macu                    # analyze + action plan for the agent to execute
macu --days 30          # last 30 days only
macu --source opencode  # OpenCode only
macu --source claude    # Claude Code only
macu --source codex     # Codex only
macu --json             # raw JSON for scripting

The agent reads the output, follows the action plan, edits your configs, then runs macu again to verify savings.

Supported Sources

Zero configuration. macu probes all locations and merges whatever it finds.

How It Works

detect sources → load data → normalize → analyze → render
     ↓              ↓            ↓          ↓         ↓
  probe()       adapter()    ToolCall    analyze()  render()
                             TokenSnap

1. Detect - Probes known data locations for each AI tool
2. Extract - Reads tool call history via source-specific adapters (SQLite queries, JSONL parsing)
3. Normalize - Every adapter returns the same shape: { toolCalls, tokenSnapshots, sessionCount }
4. Analyze - Frequency, recency, token overhead, MCP server grouping, recommendations
5. Render - Charts, tables, and recommendations in the terminal

Adding New Sources

Each adapter is one file in src/sources/. Two exports:

export function probeMyTool()          // → { exists: boolean, ...meta }
export function loadMyTool(meta, days) // → { toolCalls, tokenSnapshots, sessionCount }

Register in src/sources/index.mjs. Run macu --source mytool. Done.

See AGENTS.md for the full adapter interface, data model, and conventions.

Background: The Discovery

This tool was born from a billing investigation.

After noticing unexpectedly high token usage on an Anthropic Team subscription, a deep audit of the OpenCode SQLite database (32,848 tool calls across 50 days) revealed:

• 95 MCP tools were loaded, but only 35 were ever called
• 60 duplicate/unused tools added 37,531 chars (~9,000 tokens) of overhead to every single API request
• Over 50 days and 830 sessions, this wasted hundreds of millions of tokens

The root cause: every API call to Anthropic includes ALL tool definitions in the request body. More tools = more tokens burned before you even type a word.

Commands

Companion: live usage monitors (cu / cou)

macu finds historical waste (unused MCP tools bloating every request). Once you're done cleaning up, you'll want to track live usage too: how much of your 5-hour / weekly window you've already burned through, with reset timers.

That's what the companion repo ai-usage-monitors does:

• cu - Claude Code subscription usage (5h limit, weekly limit)
• cou - Codex CLI usage (5h window, 7d window, team / premium tiers)

Install it standalone:

curl -fsSL https://raw.githubusercontent.com/minhvoio/ai-usage-monitors/main/install.sh | bash

Or let macu's installer offer it at the end - it prompts Install cu + cou too? [Y/n] by default. Use both tools if you pay for Claude Code or Codex subscriptions.

Requirements

• Node.js ≥ 18
• At least one AI tool with usage history

License

MIT