Route Or Answer

skill: route-or-answer

purpose

Decide whether a task needs a tool call or can be answered directly. Stops agents from calling APIs for questions they already know the answer to.

whentouse

• Before any tool call in an agent loop
• When the agent has 2+ tools available and could reach for any of them
• When tool calls have latency, cost, or rate-limit implications

whennotto_use

• Task explicitly requires live or user-specific data — just call the tool
• Task is ambiguous — run /clarify-intent first, then this
• You've already called the tool and have the data

input

task: string           # Current objective or user request
available_tools: list  # Tool names + one-line descriptions
context: string        # What's already known in this session

output

{
  "decision": "answer_directly" | "use_tool",
  "tool_name": "string | null",
  "reason": "string",
  "answer": "string | null"
}

instructions

Decide: can you answer this from general knowledge or context already provided, or does it need a tool?

Answer directly if:
- The answer is stable knowledge (geography, math, definitions, well-known facts)
- The answer is already present in the provided context

Use a tool if:
- The answer changes over time (prices, weather, status, user records)
- The task requires an action (create, update, send, delete)
- The answer depends on data specific to this user or session not already in context

Pick one. Do not hedge. If genuinely unsure, default to use_tool — safer error.

Return JSON only. No prose before or after.

constraints

• Max output tokens: 150
• Must be valid JSON
• If decision is answer_directly, answer field must be filled
• If decision is use_tool, answer must be null
• If availabletools is empty: decision must be answerdirectly — there is nothing to call

example

Input:

task: "What timezone is Tokyo in?"
available_tools: ["web_search", "calendar_api", "user_profile"]
context: ""

Output:

{
  "decision": "answer_directly",
  "tool_name": null,
  "reason": "Tokyo timezone is stable factual knowledge.",
  "answer": "Tokyo is JST (UTC+9)."
}

---

Input:

task: "What is the user's current plan?"
available_tools: ["billing_api"]
context: "user_id: 8821"

Output:

{
  "decision": "use_tool",
  "tool_name": "billing_api",
  "reason": "Subscription tier is user-specific, not in context.",
  "answer": null
}

feedback_log

2026-05-29 | availabletools was empty but task needed live data | skill defaulted to usetool with no tool to call — loop hung | added constraint: if availabletools is empty, decision must be answerdirectly

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: 0-uddeshya-0
• Source: 0-uddeshya-0/agent-skills
• License: MIT

Install and usage instructions live in the source repository linked above.