start-cost SKILL.md skillA
This file is byte-identical to the first copy the registry indexed. Same content hash, so the same checks give both the same grade.
start-cost from xsyetopz/claudetto is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add xsyetopz/claudetto/start-cost@git:20261016.3621f4bPins git:20261016.3621f4b in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- xsyetopz/claudetto
- Path
src/plugins/claudetto-sessions/slices/start-cost/skills/start-cost/SKILL.md- Versions recorded
- 1
- Latest version
- git:20261016.3621f4b, committed Oct 16, 2026
- Size
- 1,994 bytes
- Repository stars
- 3
- License
- MIT
Measures what a Claude Code session sends at its start, by source, and compares a start with a plugin against a start without it. Use when asked what a plugin, skill list, or MCP server costs at the start of a session, not for usage over time.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
<task>
Show the user where the start of a session spends its context.
Each listed skill, agent, plugin, and MCP tool adds a fixed cost to every session.
{{include usage-figures}}
</task>
<procedure>
The bin `claudetto-start` reads a transcript (a `.jsonl` file under `~/.claude/projects/`).
It changes no file.
1. Report one session.
With no argument, it reads the newest transcript of the current folder:
```bash
claudetto-start
claudetto-start /path/to/session.jsonl
```
The section `Start by source` lists the characters of each source: the built-in set, each plugin (by the name prefix of its skills, agents, and tools), each MCP server, `CLAUDE.md` and memory, the output style, and the system prompt.
The first line gives the tokens of the first request.
2. Compare a start with a plugin and a start without it.
The transcript of a session shows only the plugins that were on, so the user must start two sessions.
Ask the user for the two transcript paths, or tell the user to start one session with the plugin and one without it, with the same folder and the same first prompt.
Then run:
```bash
claudetto-start --compare WITHOUT.jsonl WITH.jsonl
…Read the whole file at its exact version.
How to install
mdr add xsyetopz/claudetto/start-cost@sha256:3e8737735a74974dThe line at the top of this page pins the label git:20261016.3621f4b, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_4nkjnre3dfun6fp3)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Oct 16, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (1994 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
xsyetopz/claudetto · 3 stars · license MIT · pushed 2026-10-19 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_4nkjnre3dfun6fp3 GET https://markdownregistry.com/api/v1/resolve?ref=xsyetopz/claudetto/start-cost GET https://markdownregistry.com/api/v1/blob/3e8737735a74974d1cf04be08ef75c5e1b6d43d0f4dec187a663d00468fe5591
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.
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