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Tool Call Flow

Category: Engineering  ·  Sub-category: architecture  ·  Last updated:
ai:claude
Use when reasoning about the protocol-level cycle by which a language model uses external tools: the four phases (declaration, request, execution, continuation), the message-history state model that ties them together, the structural differences between vendor protocols (Anthropic tool-use, OpenAI function-calling, MCP) and how they compose, parallel vs sequential tool calls, error handling and retries inside the cycle, and the separation between the model (which produces structured intent) and the runtime (which executes the intent and routes results back). Do NOT use for the decision of when and how many tool calls to make (use tool-call-strategy), agent-system architecture and coordination patterns (use agent-engineering), prompt wording (use prompt-craft), or the design of evals for tool-use behavior (use agent-eval-design).

What this skill does

Tool Call Flow is a community-contributed Claude Code skill in the architecture sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/tool-call-flow/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when reasoning about the protocol-level cycle by which a language model uses external tools: the four phases (declaration, request, execution, continuation), the message-history state model that ties them together, the structural differences between vendor protocols (Anthropic tool-use, OpenAI function-calling, MCP) and how they compose, parallel vs sequential tool calls, error handling and retries inside the cycle, and the separation between the model (which produces structured intent) and the runtime (which executes the intent and routes results back). Do NOT use for the decision of when and how many tool calls to make (use tool-call-strategy), agent-system architecture and coordination patterns (use agent-engineering), prompt wording (use prompt-craft), or the design of evals for tool-use behavior (use agent-eval-design).

Who uses this skill

The Tool Call Flow Claude Code skill is built for software engineers, backend developers, full-stack teams, and technical leads building and maintaining production systems. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 69,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/tool-call-flow
curl -L https://claudskills.com/skills/tool-call-flow/SKILL.md \
  -o ~/.claude/skills/tool-call-flow/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/tool-call-flow/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/tool-call-flow/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\tool-call-flow\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Attribution & license

More Engineering skills

Browse all Engineering skills in the ClaudSkills registry, or explore these other picks from the same category:

Browse all Engineering skills → Top 100 skills
Part of ClaudSkills — the open registry for Claude Skills & Claude Code Skills.  ·  What's New  ·  Install guide  ·  About  ·  llms.txt

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