Borrowing it
Nothing to install: this file belongs to TheSmokeDev/taskchad-os. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/TheSmokeDev/taskchad-os/master/.claude/skills/mcp-client/SKILL.mdgit clone --depth 1 https://github.com/TheSmokeDev/taskchad-osWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/thesmokedev/taskchad-os/mcp-client)<a href="https://agentmods.dev/skills/thesmokedev/taskchad-os/mcp-client"><img src="https://agentmods.dev/badge/skills/thesmokedev/taskchad-os/mcp-client/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/thesmokedev/taskchad-os/mcp-client"><img src="https://agentmods.dev/badge/skills/thesmokedev/taskchad-os/mcp-client.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 4 findings, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high Agent Snooping · line 3 Skill accesses MCP server configuration files (mcp.json). MCP configs contain server URLs, authentication tokens, and tool definitions — reading them allows the skill to discover and potentially abuse other tool integrations.Fix: Remove all code or instructions that read MCP configuration files (mcp.json). MCP server details should be managed by the agent runtime, not read by individual skills.
- medium Agent Snooping · line 66 Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
- medium Agent Snooping · line 76 Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
- low MCP Rug Pull · line 122 pip install without ==version installs the latest release, which could include malicious changes.Fix: Pin the version: pip install package==1.2.3
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00102 | $0.01043 |
| Opus 5.5 | $0.00041 | $0.00417 |
| Sonnet 5.5 | $0.00020 | $0.00209 |
| Haiku 4.5 | $0.00010 | $0.00104 |
Grade A, and why
mcp-client scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
This is a copy
86% identical to mcp-client — 5 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 130 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Universal MCP Client
Connect to any MCP server with progressive disclosure - load tool schemas on-demand instead of dumping thousands of tokens into context upfront.
Skill Location
This skill is located at: .claude/skills/mcp-client/
Script path: .claude/skills/mcp-client/scripts/mcp_client.py
Configuration
The script looks for config in this order:
MCP_CONFIG_PATHenv var (custom path)references/mcp-config.json(this skill's config - recommended).mcp.jsonin project root~/.claude.json
Your config file: .claude/skills/mcp-client/references/mcp-config.json
Edit this file to add your API keys. The example file (example-mcp-config.json) is kept as a reference template.
If the user hasn't provided their Zapier API key yet, ask them for it.
Running Commands
All commands use the script at .claude/skills/mcp-client/scripts/mcp_client.py:
# List configured servers
python .claude/skills/mcp-client/scripts/mcp_client.py servers
# List tools from a server
python .claude/skills/mcp-client/scripts/mcp_client.py tools <server_name>
# Call a tool
python .claude/skills/mcp-client/scripts/mcp_client.py call <server> <tool> '{"arg": "value"}'
Workflow
- Check config exists - Run
serverscommand. If error, create.mcp.json - List servers - See what MCP servers are configured
- List tools - Get tool schemas from a specific server
- Call tool - Execute a tool with arguments
Commands Reference
| Command | Description |
|---|---|
servers |
List all configured MCP servers |
tools <server> |
List tools with full parameter schemas |
call <server> <tool> '<json>' |
Execute a tool with arguments |
Example: Zapier
# 1. List servers to confirm Zapier is configured
python .claude/skills/mcp-client/scripts/mcp_client.py servers
# 2. List Zapier tools
python .claude/skills/mcp-client/scripts/mcp_client.py tools zapier
# 3. Call a Zapier tool
python .claude/skills/mcp-client/scripts/mcp_client.py call zapier <tool_name> '{"param": "value"}'
What ships with it
4 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2mo ago First seen · 130 lines · 102 tokens per session scan A b4cad61e866c
mcp-client is a skill published in the GitHub repository TheSmokeDev/taskchad-os (28 stars, last pushed 1mo ago), licensed MIT. It adds 102 tokens to every session and 1,043 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 86% identical to mcp-client, differing in 5 lines, and is treated as a copy.
mcp-client compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| mcp-clientTheSmokeDev/taskchad-os | Skill | 28 | 1mo ago | MIT | A | 102 | Claude Code |
| graphifymycelium-hq/ai-brain-starter | Skill | 50 | yesterday | MIT | A | 111 | Claude Code |
| insightsmycelium-hq/ai-brain-starter | Skill | 50 | yesterday | MIT | A | 91 | Claude Code |
| setup-brainmycelium-hq/ai-brain-starter | Skill | 50 | yesterday | MIT | A | 66 | Claude Code |
| second-brain-mappingmycelium-hq/ai-brain-starter | Skill | 50 | yesterday | MIT | A | 116 | Claude Code |
| sunday-reviewmycelium-hq/ai-brain-starter | Skill | 50 | yesterday | MIT | A | 102 | Claude Code |
| coachmycelium-hq/ai-brain-starter | Skill | 50 | yesterday | MIT | A | 103 | Claude Code |