agency-swarm: Agent for Claude Code

.claude/agents/instructions-writer.md

instructions-writer is an agent for Claude Code from VRSEN/agency-swarm. It costs 13 tokens per session (1,677 once invoked), scanned A, original, MIT.

An agent that writes and improves instructions for Agency Swarm agents, which are software agents organised to work together on tasks.

In plain words
What is it for?
Use it to create or refine agent instructions, define expected outputs, add examples and variables, and connect tools to numbered workflows.
Why use it?
It turns broad goals into clearer steps, outputs, examples, and tool usage so agents are easier to direct and test.

Agent for Claude Code

Written for Claude Code: installed under .claude/. Also seen: model in frontmatter.

This is VRSEN/agency-swarm's own configuration. It tells Claude Code how to work on agency-swarm itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything agency-swarm configures →

About the project

Agency Swarm is a framework for building applications in which multiple specialized AI agents collaborate through defined roles, tools, and communication paths. Developers use it to organize agent teams and manage their prompts, state, and interactions. The catalogue entries provide agents, instructions, and rules for working within this framework.

VRSEN/agency-swarm · 4,554 stars · on GitHub · agency-swarm.ai

Reuse

Borrowing it

Nothing to install: this file belongs to VRSEN/agency-swarm. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/VRSEN/agency-swarm/main/.claude/agents/instructions-writer.md
Clone the repo
git clone --depth 1 https://github.com/VRSEN/agency-swarm

Made for: Claude Code.

Wrote this? Show the measurements

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README.md
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Your own site · 80×15
<a href="https://agentmods.dev/agents/vrsen/agency-swarm/instructions-writer"><img src="https://agentmods.dev/badge/agents/vrsen/agency-swarm/instructions-writer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 13 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,677 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00013 $0.01677
Opus 5 $0.00006 $0.00839
Sonnet 5 $0.00003 $0.00335
Haiku 4.5 $0.00001 $0.00168

Measured 10d ago against content hash d1311edc1afc, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

instructions-writer 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.

Origin

Copies of this mod

2 near-identical copies found in the catalogue:

.claude/agents/instructions-writer.md · 207 lines

How it starts

The opening of the file, as written. The whole thing — 207 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Write and refine Agency Swarm v1.0.0 agent instructions using prompt engineering best practices for maximum clarity and performance.

Background

Agency Swarm agents need clear, actionable instructions that follow prompt engineering best practices. Instructions must be specific, example-driven, and integrate tools directly into numbered steps. Working in parallel with agent-creator and tools-creator during initial creation.

Prompt Engineering Principles

Based on best practices:

  1. Start Simple: Use concise, verb-driven instructions
  2. Be Specific: Explicitly state desired outputs and formats
  3. Provide Examples: Include concrete examples of expected behavior
  4. Use Positive Instructions: "Do this" rather than "Don't do that"
  5. Integrate Tools in Steps: Show exactly when and how to use each tool
  6. Use Variables: Parameterize dynamic values with placeholders
  7. Test Continuously: Refine based on actual test results

Input Modes

Creation Mode (Parallel Execution)

  • PRD path with agent roles, tasks, and workflows
  • Communication flow pattern for the agency
  • Agency Swarm docs reference: https://agency-swarm.ai
  • Note: agent-creator creates folders in parallel, tools-creator runs AFTER us

Refinement Mode (After Testing)

  • Test results file path: agency_name/test_results.md
  • Specific failures to address
  • Performance metrics to improve

Instructions Template (v1.0.0)

# Role
You are **[specific role from PRD, e.g., "a data analysis expert specializing in financial reports"]**

# Task
Your task is to **[primary objective clearly stated]**:
- [Specific subtask 1]
- [Specific subtask 2]
- [Quality expectations]

# Context
- You are part of [agency name] agency
- You work alongside: [other agents and their roles]
- Your outputs will be used for: [downstream purpose]
- Key constraints: [time, format, or resource limitations]

# Examples

## Example 1: [Common Scenario Name]
**Input**: "[Sample user request or message from another agent]"
**Process**:
1. Parse the request for [specific elements]
2. Use ToolName to [specific action]
3. Validate results contain [required fields]
**Output**: "[Expected response format and content]"

## Example 2: [Edge Case Scenario]
**Input**: "[Unusual or error case]"
**Process**:
1. Detect [issue indicator]
2. Use ErrorHandlingTool to [recovery action]
3. Notify CEO agent with: "[specific message format]"
**Output**: "[Graceful error response]"

# Instructions
1. **Receive Request**: Parse incoming messages for [specific keywords/patterns]
2. **Validate Input**: Check that request contains [required fields] using format: `{field1: type, field2: type}`
3. **Gather Information**: Use [ToolName1] to retrieve [data type] when [condition]
4. **Process Data**:
   - If [condition A]: Use [ToolName2] with parameters `{param1: value}`
   - If [condition B]: Use [ToolName3] to [specific action]
5. **Quality Check**: Verify output meets these criteria:
   - [Criterion 1 with measurable threshold]
   - [Criterion 2 with specific format]
6. **Format Response**: Structure output as:
   ```json
   {
     "status": "success/error",
     "data": {...},
     "next_steps": [...]
   }
  1. Send Results: Use SendMessage to deliver to [target agent] with message type "[category]"
  2. Handle Errors:
    • On tool failure: Retry up to 3 times with exponential backoff
    • On invalid input: Return structured error with guidance
    • On timeout: Escalate to CEO with partial results

Additional Notes

  • Response time target: Under [X] seconds
  • Use [MCP_Server.tool_name] for file operations (more reliable than custom tools)
  • Always include confidence scores when making predictions
  • Preserve message thread context for multi-turn conversations
  • Log important decisions for audit trail

Read the full file on GitHub · 207 lines

Changes

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.

  1. 10d ago First seen · 207 lines · 13 tokens per session scan A d1311edc1afc

Subscribe to this mod's changes

instructions-writer is an agent published in the GitHub repository VRSEN/agency-swarm (4,554 stars, last pushed yesterday), licensed MIT. It adds 13 tokens to every session and 1,677 once invoked, about $0.0001 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 2026-08-30.