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.
Play or validate Slay the Spire 2 through the local sts2-ai-agent MCP tools, including access to live game metadata from the Mod API (cards/relics/monsters/etc.) for richer decision-making.
Install Sts2 MCP Player
$ npx skills add CharTyr/STS2-Agent --skill sts2-mcp-player -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install CharTyr/STS2-Agent sts2-mcp-player --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/CharTyr/STS2-Agent.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/sts2-mcp-player .claude/skills/sts2-mcp-player && 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 "sts2-mcp-player" agent skill from https://github.com/CharTyr/STS2-Agent/tree/main/skills/sts2-mcp-player into .claude/skills/sts2-mcp-player/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sts2-mcp-player", 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/CharTyr/STS2-Agent/tree/main/skills/sts2-mcp-playerType 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 CharTyr/STS2-Agent --skill sts2-mcp-player -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install CharTyr/STS2-Agent sts2-mcp-player --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/CharTyr/STS2-Agent.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/sts2-mcp-player .agents/skills/sts2-mcp-player && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "sts2-mcp-player" agent skill from https://github.com/CharTyr/STS2-Agent/tree/main/skills/sts2-mcp-player into .agents/skills/sts2-mcp-player/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sts2-mcp-player", 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 CharTyr/STS2-Agent --skill sts2-mcp-player -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install CharTyr/STS2-Agent sts2-mcp-player --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/CharTyr/STS2-Agent.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/sts2-mcp-player .cursor/skills/sts2-mcp-player && 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 "sts2-mcp-player" agent skill from https://github.com/CharTyr/STS2-Agent/tree/main/skills/sts2-mcp-player into .cursor/skills/sts2-mcp-player/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sts2-mcp-player", 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/CharTyr/STS2-Agent.git --path skills/sts2-mcp-player--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 CharTyr/STS2-Agent --skill sts2-mcp-player -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install CharTyr/STS2-Agent sts2-mcp-player --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/CharTyr/STS2-Agent.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/sts2-mcp-player .gemini/skills/sts2-mcp-player && 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 "sts2-mcp-player" agent skill from https://github.com/CharTyr/STS2-Agent/tree/main/skills/sts2-mcp-player into .gemini/skills/sts2-mcp-player/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sts2-mcp-player", 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 CharTyr/STS2-Agent sts2-mcp-playerInstalls 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 CharTyr/STS2-Agent --skill sts2-mcp-player -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/CharTyr/STS2-Agent.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/sts2-mcp-player .github/skills/sts2-mcp-player && 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 "sts2-mcp-player" agent skill from https://github.com/CharTyr/STS2-Agent/tree/main/skills/sts2-mcp-player into .github/skills/sts2-mcp-player/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sts2-mcp-player", 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 CharTyr/STS2-Agent --skill sts2-mcp-player -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install CharTyr/STS2-Agent sts2-mcp-player --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/CharTyr/STS2-Agent.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/sts2-mcp-player .opencode/skills/sts2-mcp-player && 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 "sts2-mcp-player" agent skill from https://github.com/CharTyr/STS2-Agent/tree/main/skills/sts2-mcp-player into .opencode/skills/sts2-mcp-player/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sts2-mcp-player", 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
sts2-mcp-player- GitHub stars
- 338
- Token cost
- ~5.5k tokens
- SKILL.md length
- 2,828 words
- Files
- 7 (incl. references)
- Skills in repo
- 1
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
Play or validate Slay the Spire 2 through the local sts2-ai-agent MCP tools, including access to live game metadata from the Mod API (cards/relics/monsters/etc.) for richer decision-making.
- Works in 3 steps: Use local_server_name first. → If local is unavailable, retry the same… → If aliases are unavailable but STS2…
- Navigating the main menu
- SKILL.md covers Server Names, Recommended SubAgent Config, Quick Start and Game Data Priority Rules, plus 10 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Sts2 MCP Player is an agent skill from CharTyr/STS2-Agent. Play or validate Slay the Spire 2 through the local sts2-ai-agent MCP tools, including access to live game metadata from the Mod API (cards/relics/monsters/etc.) for richer decision-making. Use when navigating the main menu, timeline, map, combat, rewards, shops, rest sites, events, chests, card selections, potions, or debug-enabled test flows, and when another agent needs a strict state-first workflow that avoids stale indexes, invalid room actions, and tool-profile confusion.
Its SKILL.md is about 5.5k tokens, which your agent loads only when the skill is triggered. The skill folder holds 8 other files, including reference files (for example `README.md`, `agents/openai.yaml` and `references/debug-and-validation.md`).
It sits in Agent Workflows, covering MCP servers. It works with Model Context Protocol. The repository describes itself as: 杀戮尖塔2的MOD，将杀戮尖塔2的游戏状态与操作暴露为本地 HTTP API 包装成 MCP Server，供支持 MCP 的AI客户端直接调用.
When your agent uses it
- Navigating the main menu
- Card selections
- Debug-enabled test flows
- When another agent needs a strict state-first workflow that avoids stale indexes
Example prompts
- “/sts2-mcp-player”
Workflow steps
3 steps, taken from the first numbered list in SKILL.md.
- Use local_server_name first.
- If local is unavailable, retry the same flow on remote_server_name.
- If aliases are unavailable but STS2 tools are already exposed, call the tools directly.
What it can do on your machine
Read from SKILL.md and the folder at commit 7b3cb83. 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 toml).
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
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
Sts2 MCP Player loads about 5.5k tokens when it runs, and up to ~13k if it reads all its reference files. Until then it costs about 125 tokens; SKILL.md has 2,828 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
Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 2,828 words (~5,518 tokens).
“Use this skill when driving the STS2 MCP mod as a gameplay agent or when validating the live MCP contract against the running game.”
- name
- sts2-mcp-player
Files
SKILL.md and 6 other files (references) in skills/sts2-mcp-player of CharTyr/STS2-Agent.
- SKILL.md
- README.md
- agents/openai.yaml
- references/debug-and-validation.md
- references/remote-connection.md
- references/screen-playbooks.md
- references/strategy.md
Open the folder on GitHubat commit 7b3cb83
Compare with similar skills
Sts2 MCP Player 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 |
|---|---|---|---|---|---|---|
| Sts2 MCP Player this skillCharTyr/STS2-Agent | 338 | — | ~5.5k | Automated safety check: Pass | Custom licence | |
| MCP Server Builderanthropics/skills | 180k | 63 repos | ~2.3k | Automated safety check: Pass | Apache-2.0 | |
| MCP Server BuildershareAI-lab/learn-claude-code | 78k | 5 repos | ~1.2k | Automated safety check: Pass | MIT | |
| MCP Integration for Pluginsanthropics/claude-plugins-official | 38k | 11 repos | ~3.1k | Automated safety check: Pass | Apache-2.0 | |
| Crush Configurationcharmbracelet/crush | 29k | — | ~3.7k | Automated safety check: Pass | Custom licence | |
| Context Mode Output Sandboxmksglu/context-mode | 26k | — | ~4.1k | Automated safety check: Pass | Custom licence |
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Crush Configuration
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Explains how to configure the Crush coding agent with crushrc or crush.json, covering providers, models, LSPs, MCP servers, hooks, permissions and config precedence.
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Warp GUI to Agent CLI Migration
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Related
Works with
Categories
Questions about Sts2 MCP Player
What does Sts2 MCP Player do?
Play or validate Slay the Spire 2 through the local sts2-ai-agent MCP tools, including access to live game metadata from the Mod API (cards/relics/monsters/etc.) for richer decision-making. Sts2 MCP Player is an agent skill from CharTyr/STS2-Agent.) for richer decision-making.
When should I use Sts2 MCP Player?
Sts2 MCP Player fits situations like: navigating the main menu; card selections; debug-enabled test flows; when another agent needs a strict state-first workflow that avoids stale indexes.
How do I install Sts2 MCP Player in Claude Code?
Run `npx skills add CharTyr/STS2-Agent --skill sts2-mcp-player -a claude-code`. Or copy the skill folder (skills/sts2-mcp-player in CharTyr/STS2-Agent) into .claude/skills/sts2-mcp-player in your project. Claude Code loads it when a task matches its description.
How do I install Sts2 MCP Player in Codex?
Run `npx skills add CharTyr/STS2-Agent --skill sts2-mcp-player -a codex`. Or copy the skill folder (skills/sts2-mcp-player in CharTyr/STS2-Agent) into .agents/skills/sts2-mcp-player in your project. Codex loads it when a task matches its description.
Can I use Sts2 MCP Player 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 CharTyr/STS2-Agent --skill sts2-mcp-player -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/sts2-mcp-player, .gemini/skills/sts2-mcp-player, .github/skills/sts2-mcp-player and .opencode/skills/sts2-mcp-player in your project.
What does Sts2 MCP Player need to run?
SKILL.md names no scripts, command-line tools or credentials: Sts2 MCP Player is instructions for the agent only.
Does Sts2 MCP Player access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Sts2 MCP Player 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 Sts2 MCP Player use?
Sts2 MCP Player has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.
How many tokens does Sts2 MCP Player use?
About 5.5k tokens (SKILL.md is roughly 22k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 7.4k tokens, read only when the agent opens those files.
What are the alternatives to Sts2 MCP Player?
Skills that share tags, products or a category with Sts2 MCP Player: MCP Server Builder (anthropics/skills, 180k stars), MCP Server Builder (shareAI-lab/learn-claude-code, 78k stars), MCP Integration for Plugins (anthropics/claude-plugins-official, 38k stars) and Crush Configuration (charmbracelet/crush, 29k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Sts2 MCP Player?
CharTyr (a GitHub user) maintains it in CharTyr/STS2-Agent, which has 338 GitHub stars. The repository was last updated on October 7, 2026.
Source: CharTyr/STS2-Agent on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.