# 🕮 End to End Agent Development Guide

### 🎯 Purpose

This guide explains the **complete lifecycle of agent development** — from defining business requirements to testing the final implementation.\
It ensures every agent is **aligned with business objectives**, **technically sound**, and **maintainable at scale**.

***

{% stepper %}
{% step %}

### Step 1 — Define Business Requirements

#### 1.1 Clarify Objectives

Start with a clear, concise description of **what problem** the agent solves and **why it matters**.

Example: “Automate weekly report creation to remove repetitive manual steps and ensure consistency.”

#### 1.2 Define Functional Requirements (FR)

Each FR must be **testable, traceable, and measurable**.

<table><thead><tr><th width="88.7037353515625">FR Code</th><th width="131.40740966796875">Name</th><th>Description</th><th>Acceptance Criteria</th></tr></thead><tbody><tr><td>FR-001</td><td>Agent Creation</td><td>Allow creation of new report agents from spreadsheet configuration</td><td>New agents created per row entry</td></tr><tr><td>FR-002</td><td>Template Copy</td><td>Generate report documents from predefined templates</td><td>Generated file matches template and naming rule</td></tr><tr><td>FR-003</td><td>Reminder Trigger</td><td>Send reminders to PICs before deadline</td><td>Reminder email sent on schedule</td></tr><tr><td>FR-004</td><td>Delivery Mechanism</td><td>Auto-deliver final reports to recipients</td><td>Reports delivered successfully</td></tr><tr><td>FR-005</td><td>Audit Logging</td><td>Log all scheduled runs and delivery status.</td><td>Logs retrievable for review and compliance.</td></tr></tbody></table>

Use an **SDD (Spec Driven Development)** approach to capture user scenarios, acceptance criteria, functional requirements, and key entities. Please refer to this as an [example](https://docs.google.com/document/d/1vLUBWbv_kWa574rZsxwF821z0_tl_WZiaMqnExbM8aA/edit?tab=t.0#heading=h.2pz88obaahl5).

#### 1.3 Create Business Flow

Draw a **flowchart** showing the overall lifecycle before diving into details. This makes it easy to identify reusable components across agents.

For example:

<figure><img src="https://2983342396-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FLqsWGI0JUnaas9v07yZ5%2Fuploads%2Fmi0SonHvmXvl2KbLbfnu%2FMermaid%20Chart%20-%20Create%20complex%2C%20visual%20diagrams%20with%20text.-2025-10-28-170626.png?alt=media&#x26;token=d7192cb8-9bb5-40df-9271-e72bccb8db12" alt=""><figcaption></figcaption></figure>

```mermaid
flowchart TD

%% Main Scheduler Flow
P0([Start]) --> A0
A0[Scheduler Trigger] --> A1[Load Runtime Config from Spreadsheet]
A1 --> A2{Stage Type}
A2 -->|Creation Stage| B0[Create Report Flow]
A2 -->|Reminder Stage| C0[Reminder Flow]
A2 -->|Deliver Stage| D0[Share Report Flow]

%% CREATE REPORT FLOW
subgraph B0 [Create Weekly Report Flow]
    B1[Initialize Config & Validate Template]
    B2[Setup Folder Structure in Drive]
    B3[Copy Template & Generate New Report]
    B4[Notify PICs via Email to Fill Report]
    B1 --> B2 --> B3 --> B4
end

%% REMINDER FLOW
subgraph C0 [Reminder Flow]
    C1[Initialize Config]
    C2[Locate Report Document in Drive]
    C3{Report Found?}
    C3 -->|No| C4[Return Error Log → Missing Report]
    C3 -->|Yes| C5[Send Reminder to PIC]
    C1 --> C2 --> C3
end

%% SHARE REPORT FLOW
subgraph D0 [Share/Delivery Flow]
    D1[Initialize Config]
    D2[Retrieve Filled Report Content]
    D3{Report Valid?}
    D3 -->|No| D4[Return Error Log → Incomplete Content]
    D3 -->|Yes| D5[Compile & Distribute to Recipients]
    D5 --> D6[Log Delivery Status to AIP Audit Log]
    D1 --> D2 --> D3
end

%% COMMON ELEMENTS
subgraph E0 [Common Error Handling]
    E1[Log Failure in Audit Logs]
end


%% Flow Connections
B4 --> C0
C5 --> D0
D6 --> F0[Success ✓ Completed Run Logged]
C4 --> E0
D4 --> E0
E0 --> G0([End])
F0 --> G0([End])
```

Use **Google Drawings** to make it collaborative and gather feedback efficiently.
{% endstep %}

{% step %}

### Step 2 — Define Technical Requirements / Implementation

#### 2.1 System Flow Validation with Sequence Diagram

A **sequence diagram** clarifies data flow, dependencies, and API / Tool calls.

For example, Create Report Stage:

<figure><img src="https://2983342396-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FLqsWGI0JUnaas9v07yZ5%2Fuploads%2FvfZCBFFyOckrkwAHsYLn%2FMermaid%20Chart%20-%20Create%20complex%2C%20visual%20diagrams%20with%20text.-2025-10-28-171424.png?alt=media&#x26;token=d323c324-4ffb-4b74-972b-f4409d9371d7" alt=""><figcaption></figcaption></figure>

```mermaid
sequenceDiagram
    participant Scheduler
    participant AIP_Agent
    participant Google_Sheet as Google Sheet (Config)
    participant Google_Drive as Google Drive
    participant Google_Docs as Google Docs
    participant Gmail
    participant Audit_Log

    Scheduler->>AIP_Agent: Trigger job (Stage = Create)
    AIP_Agent->>Google_Sheet: Load Runtime Config
    AIP_Agent->>Google_Drive: Create Folder Structure
    AIP_Agent->>Google_Docs: Copy Template → Generate Report
    AIP_Agent->>Gmail: Notify PIC to fill report
    Gmail->>PIC: “Please complete your report”
    AIP_Agent->>Audit_Log: Log creation success
```

#### 2.2 Alternative Option

If sequence diagrams can’t be created in time, you also can use **a Markdown file** to clarify the data flow, dependencies and API / Tool calls.

<figure><img src="https://2983342396-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FLqsWGI0JUnaas9v07yZ5%2Fuploads%2Fj3PVZrJcHeX0bypmVH0c%2Fimage%20(56).png?alt=media&#x26;token=dffc8414-be07-4649-b549-a8b50bba238b" alt=""><figcaption></figcaption></figure>
{% endstep %}

{% step %}

### Step 3 — Design the Agent Diagram

#### 3.1 Define Agents and Tools

Use an **Agent Architecture Diagram** to map all agent components and their tools.

For example:

<img src="https://2983342396-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FLqsWGI0JUnaas9v07yZ5%2Fuploads%2FvL2kIzm29rwKlc1M6hwO%2Funknown.png?alt=media&#x26;token=40dfef80-4866-49ec-9a94-2ca2151ea7bd" alt="" data-size="original">

```mermaid
graph TD
    A[Report Agent] --> B[Create Weekly Report Tool]
    A --> D[Reminder Weekly Report Tool]
    A --> C[Share Weekly Report Tool]
```

#### 3.2 Agent Creation Best Practices

**✅ Do’s**

* Map the end-to-end flow before building.
* Keep each agent focused on a single intent.
* Define tool contracts and example I/O before prompt tuning.
* Test tools and sub-agents before testing the coordinator.

**🚫 Don’ts**

* Don’t start without a mapped flow.
* Don’t combine multiple intents in one agent.
* Don’t tune prompts before tool definitions.
* Don’t test the coordinator first.

Use **Google Drawings** to make it collaborative and gather feedback efficiently.

Example Agent Diagram that use Google Drawings can refer to [this](https://docs.google.com/drawings/d/1HEp-w-u2ioixLftyM8d7h3IY0ewkzJx1vtuSfLUlSkw/edit).

{% hint style="warning" %}
**Note**: Always begin with a **single agent using multiple tools**. \
Introduce sub-agents only for complex tasks — but remember they add latency since each sub-agent runs its own reasoning cycle.
{% endhint %}
{% endstep %}

{% step %}

### Step 4 — Define Test Case Scenarios (TDD Approach)

#### 4.1 Purpose

Test cases act as **guards** to ensure agents fulfill business requirements and behave consistently.

#### 4.2 Recommended Spreadsheet Format

Kindly refer to this [spreadsheet](https://docs.google.com/spreadsheets/d/1NfZZX-l83_6llhGpvVSzkTupt5TlfUVbwzVuXfK-SI0/edit?gid=412093730#gid=412093730) as an example.

#### 4.3 Assertion Checklist

* ✅ Expected Tools + Parameters verified
* ✅ Output validation matches expected result
* ✅ Cross-check the process (input → output) with flow chart diagram
* ✅ Cross-check tool usage with agent diagram

#### 4.4 Collaboration Tip

Document test cases in a shared spreadsheet and update them whenever logic changes.<br>

{% hint style="info" %}
For **agent integration testing**, please refer to this [cookbook](https://github.com/gl-sdk/gen-ai-sdk-cookbook/tree/main/gl-aip/examples/tests/integration).
{% endhint %}
{% endstep %}
{% endstepper %}

***

{% hint style="success" %}
For agent development after following all the steps, you can refer to [multi-agent-system-patterns](https://gdplabs.gitbook.io/gl-aip/gl-aip/multi-agent-system-patterns "mention") to start creating agent or practice first with the [hands-on-examples](https://gdplabs.gitbook.io/gl-aip/gl-aip/get-started/hands-on-examples "mention")to explore tools and multi-agent flows.
{% endhint %}

### 📚 Summary

| Phase                  | Deliverable                                  | Purpose                     |
| ---------------------- | -------------------------------------------- | --------------------------- |
| Step 1 – Business Req  | Functional Requirements (SDD) and Flow Chart | Define the “what” and “why” |
| Step 2 – Technical Req | Sequence Diagram or Markdown File            | Define the “how”            |
| Step 3 – Agent Design  | Agent Diagram                                | Define who does what        |
| Step 4 – Testing       | Test Case Spreadsheet                        | Validate expected behavior  |

***

Following this 4-step framework ensures every agent is:&#x20;

✅  Business-aligned 

✅  Technically consistent 

✅  Easily scalable 

✅  Fully testable