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 skills add ntaffzii/Skill-Agents --skill mcp-tool-managementgit clone --depth 1 https://github.com/ntaffzii/Skill-AgentsWrote 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/ntaffzii/skill-agents/mcp-tool-management)<a href="https://agentmods.dev/skills/ntaffzii/skill-agents/mcp-tool-management"><img src="https://agentmods.dev/badge/skills/ntaffzii/skill-agents/mcp-tool-management/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/ntaffzii/skill-agents/mcp-tool-management"><img src="https://agentmods.dev/badge/skills/ntaffzii/skill-agents/mcp-tool-management.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00061 | $0.01188 |
| Opus 5 | $0.00030 | $0.00594 |
| Sonnet 5 | $0.00012 | $0.00238 |
| Haiku 4.5 | $0.00006 | $0.00119 |
Grade A, and why
mcp-tool-management 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 10d 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 — 121 lines — stays where its author put it; the contents beside it link to each section on GitHub.
MCP Tool Management
Use this skill to keep tools separate from skills while making them work together.
Repository Model
skills/tells the agent how to think and behave.workflows/tells the agent what order to do work in.mcp-tools/contains executable actions.data/tools.jsonindexes tool groups, modules, and the skills/workflows that use them.
Decision Rule
Make something a tool when it performs an action that benefits from code:
- Reading or searching files
- Editing files
- Running tests or commands
- Calling APIs
- Processing media
- Fetching web pages
- Scoring or transforming prompts
Keep something as a skill when it is judgment, policy, order of operations, or domain guidance.
Make something a workflow when it combines multiple skills and tools into a repeatable job.
Tool Design Rules
- One tool should do one narrow job.
- Inputs should be typed and explicit.
- Outputs should be structured and easy for an agent to inspect.
- Errors should explain what failed and what input caused it.
- Tools should not hide broad multi-step workflows.
- Tools should not duplicate long
SKILL.mdinstructions. - Dangerous operations should require explicit confirmation or be split into inspect/apply phases.
Recommended Tool Groups
filesystem.py- list, read, search, and inspect files.registry.py- inspect available tools, workflows, runtime capabilities, and policy.toolsets.py- route agents to curated tool groups by job type.audit.py- inspect audit logs, policy denials, and recent tool activity.mcp_security_audit.py- inspect local MCP tool risk and policy coverage.security_scanner.py- scan repository secrets, dangerous commands, env exposure, and dependency risks.project.py- inspect project stack, package scripts, important files, and health.docs.py- find documentation, read README/docs files, and build context bundles.package.py- inspect package managers, manifests, lockfiles, and dependencies.api.py- inspect API route files, endpoints, OpenAPI specs, and API config hints.database.py- inspect schema files, migrations, ORM models, and database config hints.config.py- inspect config files, env keys, examples, and secret hygiene signals.test_inspection.py- inspect test files, frameworks, and source-to-test hints.task.py- scan task markers and roadmap files.dependency_risk.py- inspect offline dependency risk signals.release.py- inspect release files, versions, and readiness.backup.py- create allowed-root zip snapshots before broad edits.structured_data.py- read, validate, inspect, and patch JSON/YAML/TOML safely.memory.py- store, search, and summarize local project memories.memory_context.py- save typed decisions, preferences, bug lessons, and context packs.github.py- inspect GitHub workflow metadata and draft PR text.browser.py- inspect browser readiness and plan local UI smoke checks.sandbox.py- create temporary workspaces and compile snippets safely.git.py- inspect status, diffs, branches, and commits without mutation.git_control.py- create/switch branches, stage/unstage, and commit through allowlisted commands.playwright_tools.py- inspect live pages and capture screenshots when Playwright is available.playwright_actions.py- click, fill, assert text, inspect console/network failures, and run UI checks.code_editing.py- patch, format, diff, and test code.validation.py- plan and run allowlisted test, lint, typecheck, and build commands.prompt_improver.py- analyze, improve, score, and template prompts.web.py- search, fetch, extract, and summarize sources.media.py- inspect and process image, audio, and video files.system.py- inspect environment and run validation commands.
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.
- 10d ago First seen · 121 lines · 61 tokens per session scan A 7c893f58ce4e
mcp-tool-management is a skill published in the GitHub repository ntaffzii/Skill-Agents (4 stars, last pushed yesterday), licensed MIT. It adds 61 tokens to every session and 1,188 once invoked, about $0.0003 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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