> ## Documentation Index
> Fetch the complete documentation index at: https://aiescu.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Skill Budget: how many tokens your agent reads before you say hello

Interactive calculator: https://aiescu.com/skill-budget

Every installed agent skill and every connected MCP server is sent to the model at the start of each conversation. A skill costs its name and description every session, and its full text only when it fires. An MCP server costs the name, description and input schema of every tool, unless the client defers schemas (Claude Code's tool search sends only tool names up front).

Cost is only half the question. Does a skill improve the result? Run the free comparison workflow: https://aiescu.com/guides/agent-skills-production-workflow

## MCP servers, measured 2026-09-25

| Server | Tools | Tokens (all schemas) | Tokens (names only) |
| --- | --- | --- | --- |
| DataForSEO | 79 | 64,129 | 1,084 |
| Notion | 24 | 29,396 | 218 |
| Chrome DevTools | 30 | 9,680 | 189 |
| Supabase | 29 | 7,023 | 196 |
| Playwright | 25 | 6,853 | 199 |
| Filesystem | 14 | 3,144 | 96 |
| Git | 12 | 1,832 | 65 |
| Context7 | 2 | 1,809 | 13 |
| Memory | 9 | 1,637 | 61 |
| Sequential Thinking | 1 | 1,589 | 8 |
| Fetch | 1 | 434 | 3 |
| Time | 2 | 400 | 13 |

Method: each server was started and its tools read with the MCP `tools/list` request. Tokens = characters of name + description + input schema ÷ 2.54. Calibration: DataForSEO 79 tools: 64,129 estimated vs 63.8K in Claude Code /context (within 0.6%).

## Popular skills that load the most text when they fire (skills.sh, 2026-09-25)

| Skill | Installs | Always-on tokens | Tokens when it fires |
| --- | --- | --- | --- |
| design-taste-frontend (leonxlnx/taste-skill) | 519,061 | 98 | 29,426 |
| ai-image-generation (genmedia-labs/skills) | 662,792 | 289 | 9,611 |
| lark-im (open.feishu.cn) | 727,844 | 78 | 8,000 |
| lark-im (larksuite/cli) | 454,587 | 78 | 8,000 |
| ai-video-generation (genmedia-labs/skills) | 663,717 | 327 | 7,966 |
| hyperframes-cli (heygen-com/hyperframes) | 675,655 | 195 | 6,365 |
| lark-mail (open.feishu.cn) | 726,640 | 74 | 5,846 |
| lark-slides (open.feishu.cn) | 726,665 | 94 | 5,494 |
| hyperframes (heygen-com/hyperframes) | 643,546 | 272 | 5,451 |
| lark-drive (larksuite/cli) | 454,449 | 145 | 5,350 |

Skills data: the 499 most-installed of 9,831 skills listed on skills.sh, via its API. Tokens = characters ÷ 2.95, matching Claude Code's /context figures. Skill text is not reproduced; each skill belongs to its author under its own license.

Baseline: Claude Code's system prompt (2,400) and built-in tools (14,300), from its /context report on 2026-09-25. Numbers vary by client, version and configuration.