Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/ytvee-dev/webdev-agent-kit/mcp-toolchain-managernpx skills add ytvee-dev/webdev-agent-kit --skill mcp-toolchain-managergit clone --depth 1 https://github.com/ytvee-dev/webdev-agent-kitWhat 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 | $0.00047 | $0.02307 |
| Opus 5 | $0.00023 | $0.01154 |
| Sonnet 5 | $0.00009 | $0.00461 |
| Haiku 4.5 | $0.00005 | $0.00231 |
Grade A, and why
mcp-toolchain-manager 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 2d 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.
How it starts
The opening of the file, as written. The whole thing — 292 lines — stays where its author put it; the contents beside it link to each section on GitHub.
MCP Toolchain Manager
Purpose
Detect, explain, validate, and record tool capabilities needed by WebDev Agent Kit skills without turning tool setup into automatic or unsafe behavior.
This skill exists to keep MCP usage deliberate. It identifies which capabilities are required for the current workflow, which providers are already available, which providers are missing, what each missing capability blocks, which fallback is allowed, and what official source must be verified before installation or configuration is proposed.
When To Use
Use this skill when:
- a selected skill declares capability dependencies in
tool-capabilities-manifest.json; - a task requires rendered UI verification, official documentation lookup, project context retrieval, visual references, GitHub metadata, or another external capability;
- the agent needs to audit available vs missing MCP servers, native tools, connectors, or fallbacks;
- the user asks what MCP servers or tools are required for the skill pack;
- the user asks to install, configure, validate, or troubleshoot MCP tools;
project/mcp-profile.mdmust be created or refreshed;- a missing tool limitation must be reported before fallback behavior.
Use this skill in Standard Workflow or Deep Workflow when tool capability affects the current slice.
It may also be used in Lightweight Workflow only when the user directly asks about MCP/tool availability or when a missing already-required capability prevents a narrow task from being verified.
When Not To Use
Do not use this skill just because a task exists.
Do not use this skill for:
- one small bug when no external tool is needed;
- one obvious type error;
- one small styling adjustment that does not require rendered verification;
- documentation-only edits unrelated to MCP/tooling;
- generic planning that does not depend on tool capabilities.
Do not install tools from this skill unless the user explicitly approved that installation in the current task context and the official source was verified.
What ships with it
1 file 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.
- 2d ago First seen · 292 lines · 47 tokens per session scan A 2a2f44dca8e2
mcp-toolchain-manager is a skill published in the GitHub repository ytvee-dev/webdev-agent-kit (5 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 47 tokens to every session and 2,307 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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