Closing a Light Token account transfers remaining lamports to a destination account and the rent sponsor can reclaim sponsored rent.
Light token accounts can be closed by the owner.

The closes the account and preserves the balance as compressed token account when the account becomes . The account is loaded in flight with the same state the next time it is accessed.

Agent skill

Install the agent skill:

npx skills add https://zkcompression.com

See the AI tools guide for dedicated skills.

Rust Client
Program

Use CloseTokenAccount to close an empty Light Token account.Compare to SPL:

Guide
AI Prompt

Prerequisites

Dependencies

Cargo.toml

[dependencies]
light-token = "0.4.0"
light-client = { version = "0.19.0", features = ["v2"] }
solana-sdk = "2"
borsh = "0.10.4"
tokio = { version = "1", features = ["full"] }

Developer Environment

In-Memory (LightProgramTest)
Localnet (LightClient)
Devnet (LightClient)

Test with Lite-SVM (…)

# Initialize project
cargo init my-light-project
cd my-light-project

# Run tests
cargo test

use light_program_test::{LightProgramTest, ProgramTestConfig};
use solana_sdk::signer::Signer;

#[tokio::test]
async fn test_example() {
    // In-memory test environment 
    let mut rpc = LightProgramTest::new(ProgramTestConfig::default())
        .await
        .unwrap();

    let payer = rpc.get_payer().insecure_clone();
    println!("Payer: {}", payer.pubkey());
}

Connects to a local test validator.

npm
yarn
pnpm

npm install -g @lightprotocol/zk-compression-cli@beta

yarn global add @lightprotocol/zk-compression-cli@beta

pnpm add -g @lightprotocol/zk-compression-cli@beta

# Initialize project
cargo init my-light-project
cd my-light-project

# Start local test validator (in separate terminal)
light test-validator

use light_client::rpc::{LightClient, LightClientConfig, Rpc};

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    // Connects to http://localhost:8899
    let rpc = LightClient::new(LightClientConfig::local()).await?;

    let slot = rpc.get_slot().await?;
    println!("Current slot: {}", slot);

    Ok(())
}

Replace <your-api-key> with your actual API key. Get your API key here.

use light_client::rpc::{LightClient, LightClientConfig, Rpc};

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let rpc_url = "https://devnet.helius-rpc.com?api-key=<your_api_key>";
    let rpc = LightClient::new(
        LightClientConfig::new(rpc_url.to_string(), None, None)
    ).await?;

    println!("Connected to Devnet");
    Ok(())
}

Close Light Token Account

Find the source code here.

Instruction

use light_client::rpc::Rpc;
use light_token::instruction::{CloseAccount, LIGHT_TOKEN_PROGRAM_ID};
use rust_client::{setup_empty_associated_token_account, SetupContext};
use solana_sdk::signer::Signer;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    // Setup creates mint and empty associated token account (must be empty to close).
    let SetupContext {
        mut rpc,
        payer,
        associated_token_account,
        ..
    } = setup_empty_associated_token_account().await;
    let close_instruction = CloseAccount::new(LIGHT_TOKEN_PROGRAM_ID, associated_token_account, payer.pubkey(), payer.pubkey())
        .instruction()?;

    let sig = rpc
        .create_and_send_transaction(&[close_instruction], &payer.pubkey(), &[&payer])
        .await?;

    let account = rpc.get_account(associated_token_account).await?;
    println!("Closed: {} Tx: {sig}", account.is_none());

    Ok(())
}

Close Light Token account

Open in Cursor

---
description: Close Light Token account
allowed-tools: Bash, Read, Write, Edit, Glob, Grep, WebFetch, AskUserQuestion, Task, TaskCreate, TaskGet, TaskList, TaskUpdate, TaskOutput, mcp__deepwiki, mcp__zkcompression
---

## Close Light Token account

Context:
- Guide: https://zkcompression.com/light-token/cookbook/close-token-account
- Skills and resources index: https://zkcompression.com/skill.md
- SPL to Light reference: https://zkcompression.com/api-reference/solana-to-light-comparison
- Crates: light-token-client (actions), light-token (instructions), light-client (RPC)

SPL equivalent: spl_token::instruction::close_account → Light Token: CloseAccount

### 1. Index project
- Grep `light_token::|light_token_client::|solana_sdk|Keypair|async|CloseAccount|close_account` across src/
- Glob `**/*.rs` for project structure
- Identify: RPC setup, existing token ops, entry point for close account
- Check Cargo.toml for existing light-* dependencies and solana-sdk version
- Task subagent (Grep/Read/WebFetch) if project has multiple crates to scan in parallel

### 2. Read references
- WebFetch the guide above — follow the Rust Client tab
- WebFetch skill.md — check for a dedicated skill and resources matching this task
- TaskCreate one todo per phase below to track progress

### 3. Clarify intention
- AskUserQuestion: what is the goal? (new feature, migrate existing SPL code, add alongside existing)
- AskUserQuestion: does the project already have close operations to extend, or is this greenfield?
- AskUserQuestion: action-level API (high-level, fewer lines) or instruction-level API (low-level, full control)?
- Summarize findings and wait for user confirmation before implementing

### 4. Create plan
- Based on steps 1–3, draft an implementation plan: which files to modify, what code to add, dependency changes
- Verify existing Rpc/signer setup is compatible with the cookbook prerequisites (light_client::rpc::Rpc, solana_sdk::signature::Keypair)
- If anything is unclear or ambiguous, loop back to step 3 (AskUserQuestion)
- Present the plan to the user for approval before proceeding

### 5. Implement
- Add deps if missing: Bash `cargo add light-token-client light-token light-client --features light-client/v2`
- Follow the cookbook guide and the approved plan
- Write/Edit to create or modify files
- TaskUpdate to mark each step done

### 6. Verify
- Bash `cargo check`
- Bash `cargo test` if tests exist
- TaskUpdate to mark complete

### Tools
- mcp__zkcompression__SearchLightProtocol("<query>") for API details
- mcp__deepwiki__ask_question("Lightprotocol/light-protocol", "<q>") for architecture
- Task subagent with Grep/Read/WebFetch for parallel lookups
- TaskList to check remaining work

Guide
AI Prompt

Find a full code example at the end.

Build Account Infos and CPI the Light Token Program

Use invoke for external signers or invoke_signed when the authority is a PDA.

invoke (External signer)
invoke_signed (PDA owner)

use light_token::instruction::CloseAccountCpi;

CloseAccountCpi {
    token_program: token_program.clone(),
    account: account.clone(),
    destination: destination.clone(),
    owner: owner.clone(),
    rent_sponsor: rent_sponsor.clone(),
}
.invoke()?;

use light_token::instruction::CloseAccountCpi;

CloseAccountCpi {
    token_program: token_program.clone(),
    account: account.clone(),
    destination: destination.clone(),
    owner: owner.clone(),
    rent_sponsor: rent_sponsor.clone(),
}
.invoke_signed(&[signer_seeds])?;

Account List


	-	The light token program for CPI.
	mutable	The light-token account to close.
	mutable	Receives remaining lamports from the closed account.
	signer*	Owner of the light-token account. - *Must be signer for `invoke()`. For `invoke_signed()`, program signs via PDA seeds.
	mutable, optional	light token program PDA that fronts rent exemption at creation. * Claims rent when account compresses and/or is closed.

Full Code Example

View the source code and full example with shared test utilities.

#![allow(unexpected_cfgs, deprecated)]

use anchor_lang::prelude::*;
use light_token::instruction::CloseAccountCpi;

declare_id!("GXLCuNhnkRVp596eCdbNsZ9ua1ePbKbb344VKS7V3zQQ");

#[program]
pub mod light_token_anchor_close {
    use super::*;

    pub fn close_account(ctx: Context<CloseAccountAccounts>) -> Result<()> {
        CloseAccountCpi {
            token_program: ctx.accounts.light_token_program.to_account_info(),
            account: ctx.accounts.account.to_account_info(),
            destination: ctx.accounts.destination.to_account_info(),
            owner: ctx.accounts.owner.to_account_info(),
            rent_sponsor: ctx.accounts.rent_sponsor.to_account_info(),
        }
        .invoke()?;
        Ok(())
    }
}

#[derive(Accounts)]
pub struct CloseAccountAccounts<'info> {
    /// CHECK: Light token program for CPI
    pub light_token_program: AccountInfo<'info>,
    /// CHECK: Validated by light-token CPI
    #[account(mut)]
    pub account: AccountInfo<'info>,
    /// CHECK: Validated by light-token CPI
    #[account(mut)]
    pub destination: AccountInfo<'info>,
    pub owner: Signer<'info>,
    /// CHECK: Validated by light-token CPI
    #[account(mut)]
    pub rent_sponsor: AccountInfo<'info>,
}

Add close-account CPI to an Anchor program

Open in Cursor

---
description: Add close-account CPI to an Anchor program
allowed-tools: Bash, Read, Write, Edit, Glob, Grep, WebFetch, AskUserQuestion, Task, TaskCreate, TaskGet, TaskList, TaskUpdate, TaskOutput, mcp__deepwiki, mcp__zkcompression
---

## Add close-account CPI to an Anchor program

Context:
- Guide: https://zkcompression.com/light-token/cookbook/close-token-account
- Skills and resources index: https://zkcompression.com/skill.md
- SPL to Light reference: https://zkcompression.com/api-reference/solana-to-light-comparison
- Crate: light-token (CloseAccountCpi)
- Example: https://github.com/Lightprotocol/examples-light-token/tree/main/programs/anchor/basic-instructions/close

Key CPI struct: `light_token::instruction::CloseAccountCpi`

### 1. Index project
- Grep `declare_id|#\[program\]|anchor_lang|Account<|Pubkey|invoke|close|destination|rent` across src/
- Glob `**/*.rs` and `**/Cargo.toml` for project structure
- Identify: program ID, existing instructions, account structs, token accounts
- Read Cargo.toml — note existing dependencies and framework version
- Task subagent (Grep/Read/WebFetch) if project has multiple crates to scan in parallel

### 2. Read references
- WebFetch the guide above — review the Program tab CPI code samples
- WebFetch skill.md — check for a dedicated skill and resources matching this task
- TaskCreate one todo per phase below to track progress

### 3. Clarify intention
- AskUserQuestion: what is the goal? (add close-account to existing program, new program from scratch, migrate from SPL close_account)
- AskUserQuestion: should the owner be an external signer or a PDA? (determines invoke vs invoke_signed)
- Summarize findings and wait for user confirmation before implementing

### 4. Create plan
- Based on steps 1–3, draft an implementation plan: which files to modify, what code to add, dependency changes
- Follow the guide's step order: Build CloseAccountCpi struct → call .invoke() or .invoke_signed()
- If anything is unclear or ambiguous, loop back to step 3 (AskUserQuestion)
- Present the plan to the user for approval before proceeding

### 5. Implement
- Add deps if missing: Bash `cargo add light-token anchor-lang@0.31`
- Follow the guide and the approved plan
- Write/Edit to create or modify files
- TaskUpdate to mark each step done

### 6. Verify
- Bash `anchor build`
- Bash `anchor test` if tests exist
- TaskUpdate to mark complete

### Tools
- mcp__zkcompression__SearchLightProtocol("<query>") for API details
- mcp__deepwiki__ask_question("Lightprotocol/light-protocol", "<q>") for architecture
- Task subagent with Grep/Read/WebFetch for parallel lookups
- TaskList to check remaining work

Introduction

Light Token Program

PDA Accounts

For Other Use Cases

Learn

Resources

Close Light Token Account

Prerequisites

Close Light Token Account

Build Account Infos and CPI the Light Token Program

Full Code Example

Next Steps

Go back to the overview for the Light Token standard.

Introduction

Light Token Program

PDA Accounts

For Other Use Cases

Learn

Resources

​Prerequisites

​Close Light Token Account

​Build Account Infos and CPI the Light Token Program

​Full Code Example

​Next Steps

Go back to the overview for the Light Token standard.

Prerequisites

Close Light Token Account

Build Account Infos and CPI the Light Token Program

Full Code Example

Next Steps