MCP Server Builder
anthropics/skills
Guides the design and implementation of Model Context Protocol servers in TypeScript or Python, from tool naming and error messages to evaluation.
Use as the optional substrate-linking stage of the Butterbase journey, after deploy and before submit.
Install Journey Substrate
$ npx skills add butterbase-ai/butterbase-skills --skill journey-substrate -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install butterbase-ai/butterbase-skills journey-substrate --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/butterbase-ai/butterbase-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/journey-substrate .claude/skills/journey-substrate && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "journey-substrate" agent skill from https://github.com/butterbase-ai/butterbase-skills/tree/main/skills/journey-substrate into .claude/skills/journey-substrate/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "journey-substrate", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/butterbase-ai/butterbase-skills/tree/main/skills/journey-substrateType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add butterbase-ai/butterbase-skills --skill journey-substrate -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install butterbase-ai/butterbase-skills journey-substrate --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/butterbase-ai/butterbase-skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/journey-substrate .agents/skills/journey-substrate && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "journey-substrate" agent skill from https://github.com/butterbase-ai/butterbase-skills/tree/main/skills/journey-substrate into .agents/skills/journey-substrate/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "journey-substrate", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add butterbase-ai/butterbase-skills --skill journey-substrate -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install butterbase-ai/butterbase-skills journey-substrate --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/butterbase-ai/butterbase-skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/journey-substrate .cursor/skills/journey-substrate && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "journey-substrate" agent skill from https://github.com/butterbase-ai/butterbase-skills/tree/main/skills/journey-substrate into .cursor/skills/journey-substrate/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "journey-substrate", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/butterbase-ai/butterbase-skills.git --path skills/journey-substrate--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add butterbase-ai/butterbase-skills --skill journey-substrate -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install butterbase-ai/butterbase-skills journey-substrate --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/butterbase-ai/butterbase-skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/journey-substrate .gemini/skills/journey-substrate && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "journey-substrate" agent skill from https://github.com/butterbase-ai/butterbase-skills/tree/main/skills/journey-substrate into .gemini/skills/journey-substrate/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "journey-substrate", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install butterbase-ai/butterbase-skills journey-substrateInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add butterbase-ai/butterbase-skills --skill journey-substrate -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/butterbase-ai/butterbase-skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/journey-substrate .github/skills/journey-substrate && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "journey-substrate" agent skill from https://github.com/butterbase-ai/butterbase-skills/tree/main/skills/journey-substrate into .github/skills/journey-substrate/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "journey-substrate", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add butterbase-ai/butterbase-skills --skill journey-substrate -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install butterbase-ai/butterbase-skills journey-substrate --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/butterbase-ai/butterbase-skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/journey-substrate .opencode/skills/journey-substrate && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "journey-substrate" agent skill from https://github.com/butterbase-ai/butterbase-skills/tree/main/skills/journey-substrate into .opencode/skills/journey-substrate/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "journey-substrate", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
journey-substrate- GitHub stars
- 534
- Token cost
- ~741 tokens
- SKILL.md length
- 305 words
- Files
- 1
- Skills in repo
- 39
- Repo updated
- First seen
- Licence
- MIT
At a glance
Use as the optional substrate-linking stage of the Butterbase journey, after deploy and before submit.
- Works in 6 steps: Refresh docs. Call butterbase_docs with… → Confirm. Ask the user → On skip: mark the row - [x] substrate… → …
- Agent Workflows work in your project
- SKILL.md covers When to use, Procedure and Anti-patterns
- Reaches docs.butterbase.ai
What it does
Journey Substrate is an agent skill from butterbase-ai/butterbase-skills. Use as the optional substrate-linking stage of the Butterbase journey, after deploy and before submit. Asks whether to connect the deployed app to the owner's substrate (so functions get ctx.substrate). Skipped by default in hackathon mode.
Its SKILL.md is about 740 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Agent Workflows. The repository describes itself as: Plugin for Butterbase.ai. The licence is MIT.
When your agent uses it
- Agent Workflows work in your project
Example prompts
- “/journey-substrate”
Workflow steps
6 steps, taken from the first numbered list in SKILL.md.
- Refresh docs. Call butterbase_docs with topic: "substrate". If the plan mentions AI memory / agent state / cross-session knowledge, also…
- Confirm. Ask the user
- On skip: mark the row - [x] substrate (skipped — no agent memory needed) in docs/butterbase/00-state.md. Write…
- On yes
- Write artifact. docs/butterbase/04b-substrate.md
- Update state. Tick the substrate row in 00-state.md.
What it can do on your machine
Read from SKILL.md and the folder at commit aa8ae69. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are markdown).
From the folder's file list and the shell code blocks in SKILL.md.
Network
Hosts in commands or code, which the agent is likely to contact:
docs.butterbase.ai
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Journey Substrate loads about 741 tokens when it runs. Until then it costs about 65 tokens; SKILL.md has 305 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from butterbase-ai/butterbase-skills at commit aa8ae69, republished under its MIT licence (© butterbase-ai). 305 words, ~741 tokens.
Download SKILL.mdSave it as
.claude/skills/journey-substrate/SKILL.md (or your agent's skills folder).- name
- journey-substrate
- description
- Use as the optional substrate-linking stage of the Butterbase journey, after deploy and before submit. Asks whether to connect the deployed app to the owner's substrate (so functions get ctx.substrate). Skipped by default in hackathon mode.
Journey Substrate Stage (optional)
Connect the deployed app to the owner's substrate so functions get ctx.substrate injected at cold start. Skip if the user has no AI-agent / memory use case.
When to use
Invoke automatically when the journey orchestrator's cursor reaches substrate. The row is optional in the checklist; skip silently if the user declines.
Procedure
Refresh docs. Call
butterbase_docswithtopic: "substrate". If the plan mentions AI memory / agent state / cross-session knowledge, also WebFetchhttps://docs.butterbase.ai/substrate. Skip ifdocs/butterbase/03b-docs-cache.mdalready coverssubstrate.Confirm. Ask the user:
"Connect
<app_id>to your substrate? This lets the app's functions read/write your agent memory viactx.substrate. You can disable later. (yes / skip)"Default: skip.
On skip: mark the row
- [x] substrate (skipped — no agent memory needed)indocs/butterbase/00-state.md. Writedocs/butterbase/04b-substrate.mdwith one line:Skipped on <date>.Return.On yes: a. If
platform_users.substrate_provisioned_atis NULL for the caller, callPOST /v1/me/substrate/provisionfirst (or invoke whatever MCP wrapper exists — checkbutterbase_docstopicsubstrate). b. Link the app. Use whichever surface you have:- MCP:
manage_appwith{ action: "link_substrate", app_id: "<app_id>" }. - CLI:
butterbase apps link-substrate <app_id>. - REST (curl):
POST /v1/me/apps/<app_id>/substrate-linkwith empty body andAuthorization: Bearer <bb_sk_*>for the app owner. The route enforces caller == app owner and setsapps.substrate_user_idto the caller's id. c. Verify:manage_appwith{ action: "get_config", app_id: "<app_id>" }and assertsubstrate_user_idis non-null. d. Smoke: invoke any HTTP function the app already has and checkctx.substrateis defined (if the function logs it). If no function exists yet, skip the smoke and note in the artifact.
- MCP:
Write artifact.
docs/butterbase/04b-substrate.md:markdown --- linked_at: <ISO> app_id: <id> substrate_user_id: <id> --- # Substrate Linkage - App linked at <ISO> - Substrate user ID: <id> - Smoke: <pass / skipped — no function yet>Update state. Tick the
substraterow in00-state.md.
Anti-patterns
- ❌ Auto-linking without asking. Substrate is a privacy-sensitive surface.
- ❌ Linking before the app has any function deployed. Wait until
journey-functionshas run. - ❌ Forgetting to handle the "substrate not yet provisioned" case. Lazy provisioning is by design.
© butterbase-ai, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in skills/journey-substrate of butterbase-ai/butterbase-skills.
Open the folder on GitHubat commit aa8ae69
Compare with similar skills
Journey Substrate next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Journey Substrate this skillbutterbase-ai/butterbase-skills | 534 | — | ~741 | Automated safety check: Pass | MIT | |
| MCP Server Builderanthropics/skills | 180k | 63 repos | ~2.3k | Automated safety check: Pass | Apache-2.0 | |
| Hook Development for Claude Code Pluginsanthropics/claude-plugins-official | 38k | 10 repos | ~4.1k | Automated safety check: Notes | Apache-2.0 | |
| Using Superpowersfarm-fe/farm | 5.6k | 35 repos | ~1.4k | Automated safety check: Pass | MIT | |
| Executing Plans Inlineobra/superpowers | 297k | 2 repos | ~5.1k | Automated safety check: Pass | MIT | |
| Skill CreatorAzure/azqr | 796 | 89 repos | ~8.2k | Automated safety check: Pass | Apache-2.0 |
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Using Superpowers
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Executing Plans Inline
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Related
Categories
Questions about Journey Substrate
What does Journey Substrate do?
Use as the optional substrate-linking stage of the Butterbase journey, after deploy and before submit. Journey Substrate is an agent skill from butterbase-ai/butterbase-skills. Use as the optional substrate-linking stage of the Butterbase journey, after deploy and before submit.
When should I use Journey Substrate?
Journey Substrate fits situations like: agent Workflows work in your project.
How do I install Journey Substrate in Claude Code?
Run `npx skills add butterbase-ai/butterbase-skills --skill journey-substrate -a claude-code`. Or copy the skill folder (skills/journey-substrate in butterbase-ai/butterbase-skills) into .claude/skills/journey-substrate in your project. Claude Code loads it when a task matches its description.
How do I install Journey Substrate in Codex?
Run `npx skills add butterbase-ai/butterbase-skills --skill journey-substrate -a codex`. Or copy the skill folder (skills/journey-substrate in butterbase-ai/butterbase-skills) into .agents/skills/journey-substrate in your project. Codex loads it when a task matches its description.
Can I use Journey Substrate in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add butterbase-ai/butterbase-skills --skill journey-substrate -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/journey-substrate, .gemini/skills/journey-substrate, .github/skills/journey-substrate and .opencode/skills/journey-substrate in your project.
What does Journey Substrate need to run?
SKILL.md names no scripts, command-line tools or credentials: Journey Substrate is instructions for the agent only.
Does Journey Substrate access the network?
SKILL.md names 1 domain. In commands or code: docs.butterbase.ai; the agent is likely to contact it when it follows the instructions. This is read from the text; nothing was executed.
Is Journey Substrate safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Journey Substrate use?
Journey Substrate is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Journey Substrate use?
About 741 tokens (SKILL.md is roughly 3k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Journey Substrate?
Skills that share tags, products or a category with Journey Substrate: MCP Server Builder (anthropics/skills, 180k stars), Hook Development for Claude Code Plugins (anthropics/claude-plugins-official, 38k stars), Using Superpowers (farm-fe/farm, 5.6k stars) and Executing Plans Inline (obra/superpowers, 297k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Journey Substrate?
butterbase-ai (a GitHub organization) maintains it in butterbase-ai/butterbase-skills, which has 534 GitHub stars. The repository holds 39 skills in this directory. The repository was last updated on October 5, 2026.
Source: butterbase-ai/butterbase-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.