ngit-grasp/AGENTS.md

AGENTS.md

This file provides guidance to agents when working with code in this repository.

Project Structure

Workspace with Two Rust Projects:

• Root: ngit-grasp (main GRASP relay implementation)
• grasp-audit/: Separate subproject with own Cargo.toml and flake.nix

Cannot build grasp-audit from root - must cd grasp-audit first.

Build & Test

Nix Flakes (Non-Standard)

CRITICAL: Use nix develop, NOT nix-shell (we use flake.nix, not shell.nix)

# ✅ Correct
cd grasp-audit
nix develop -c cargo build
nix develop -c cargo test

# ❌ Wrong
nix-shell
nix-shell --run "cargo build"

Testing ngit-grasp (Main Project)

ngit-grasp integration tests use the TestRelay fixture:

The TestRelay fixture automatically starts an instance of ngit-grasp itself and manages its lifecycle:

# Run all ngit-grasp tests (from project root)
cargo test

# Run integration tests only
cargo test --test '*'

# Run specific test file
cargo test --test nip01_compliance

How TestRelay works:

• Spawns ngit-grasp binary on a random available port
• Creates temporary directories for git and relay data
• Provides url() and domain() methods for test clients
• Automatically cleans up on drop

Example test pattern:

use common::TestRelay;

#[tokio::test]
async fn test_something() {
    let relay = TestRelay::start().await;
    // relay.url() returns "ws://127.0.0.1:{port}"
    // ... run test against ngit-grasp ...
    relay.stop().await;
}

Summary: Which Test Command for What

What you're testing	Command
ngit-grasp (this project)	cargo test from project root
ngit-relay (reference impl)	cd grasp-audit && nix develop -c bash test-ngit-relay.sh --mode test
grasp-audit unit tests	cd grasp-audit && nix develop -c cargo test --lib

Running Single Test

# ngit-grasp test (from project root)
cargo test --test nip01_compliance test_websocket_connection -- --nocapture

# grasp-audit test (from grasp-audit/)
nix develop -c cargo test --lib specific_test_name -- --nocapture

Troubleshooting

Buffer Size Errors: If you see mpsc channel buffer size panics on first test run, this is usually transient. Simply run the tests again.

Port Conflicts: Both TestRelay and test-ngit-relay.sh use random ports to avoid conflicts. If you see port errors, ensure no stale processes are running.

Code Patterns

nostr-sdk 0.43 Breaking Changes (vs 0.35)

Field access, not method calls:

// ❌ WRONG (0.35 API)
event.id()
event.tags()
for tag in &event.tags { }

// ✅ CORRECT (0.43 API)
event.id          // Direct field access
event.tags        // Direct field access
event.tags.iter() // Iterator method

Tag API changed:

// ❌ WRONG (0.35)
Tag::Generic(TagKind::Custom("clone".into()), vec![...])

// ✅ CORRECT (0.43)
Tag::custom(TagKind::custom("clone"), vec![...])

EventBuilder signature changed:

// ❌ WRONG (0.35)
EventBuilder::new(kind, content, &[tags])

// ✅ CORRECT (0.43)
EventBuilder::new(kind, content).tags(tags)

Audit Event Tagging (grasp-audit)

All audit events automatically include cleanup tags:

The grasp-audit system automatically adds three tags to every event for production cleanup and test isolation. These tags are added transparently via AuditEventBuilder::build() with 100% coverage through AuditClient::event_builder().

Automatic Tags (no manual intervention needed):

// These tags are automatically added to EVERY audit event:
["t", "grasp-audit-test-event"]              // Identifies all audit test events
["t", "audit-{run_id}"]                      // Unique ID for this audit run (correlates events)
["t", "audit-cleanup-after-{unix_timestamp}"] // Unix timestamp for cleanup scheduling

Tag Format Details:

• Uses standard NIP-01 "t" (hashtag) tags for maximum compatibility
• Unix timestamps (not ISO 8601) for easier database queries
• All tags added automatically when calling client.event_builder().build()
• No manual tag management required

Verifying Tags in Tests:

// Test that verifies automatic tag addition:
// See: grasp-audit/src/client.rs:273-302
#[test]
fn test_audit_tags_automatically_added() {
    // Creates event and verifies all three tags are present
}

Testing Implications:

• All audit events are tagged for easy cleanup
• Use run_id tag to correlate events from same audit run
• Tags enable production relay cleanup scripts
• No special handling needed in test code - tags are automatic

Configuration Management

⚠️ CRITICAL: Keep Configuration in Sync Across All Four Sources

Configuration options must be consistent across four locations:

1. Source code (src/config.rs) - Defines actual config structs, env vars, and defaults
2. Documentation (docs/reference/configuration.md) - User-facing reference for all options
3. NixOS module (nix/module.nix) - NixOS deployment configuration
4. Example env file (.env.example) - Template for development and Docker deployments

When adding/modifying ANY configuration option:

1. Update src/config.rs - Add/modify the field with proper env var name
2. Update docs/reference/configuration.md - Document the option with examples and defaults
3. Update nix/module.nix - Add/modify the NixOS option in instanceOptions
4. Update .env.example - Add the option with comments explaining usage and defaults
5. Verify consistency - Check env var names, defaults, and descriptions match exactly

Critical consistency checks:

• Environment variable names must match: NGIT_* in code, docs, module, and .env.example
• Default values must match across all four sources
• Option names should be consistent (snake_case in code, camelCase in NixOS)
• Descriptions should be similar (can be more detailed in docs)

Example: Adding a new config option

// 1. src/config.rs
#[arg(long, env = "NGIT_NEW_OPTION", default_value_t = 42)]
pub new_option: u32,

<!-- 2. docs/reference/configuration.md -->
#### `NGIT_NEW_OPTION`
**Description:** What this option does
**Type:** Integer
**Default:** `42`
**Required:** No

# 3. nix/module.nix (in instanceOptions)
newOption = mkOption {
  type = types.int;
  default = 42;
  description = "What this option does";
};

# Also add to environment mapping in mkService:
environment = {
  # ...
  NGIT_NEW_OPTION = toString cfg.newOption;
};

# 4. .env.example
# What this option does
# CLI: --new-option <value>
# Default: 42
# NGIT_NEW_OPTION=42

Documentation

⚠️ CRITICAL: Keep Architecture Docs Updated

Architecture and design documents are LIVING DOCUMENTS. When implementation diverges from the documented plan:

1. Update the doc IMMEDIATELY - Don't wait until "later"
2. Document what was actually built, not what was originally planned
3. Note why decisions changed - Future readers need this context
4. Files to watch: docs/explanation/architecture.md, docs/explanation/decisions.md

This was a key learning from GRASP-01: docs described plans, not implementation, causing confusion.

Diátaxis Framework Used:

• docs/tutorials/ - Learning-oriented
• docs/how-to/ - Task-oriented
• docs/reference/ - Information-oriented
• docs/explanation/ - Understanding-oriented

Session files go in work/ (gitignored except README.md)

• Archive valuable content to docs/archive/YYYY-MM-DD-*.md at session end
• Delete temporary files
• Keep root clean (only README.md, AGENTS.md)

Critical Gotchas

1. Workspace compilation: Can't cargo build from root for grasp-audit
2. Nix environment: Must use nix develop, not nix-shell
3. nostr-sdk API: Fields not methods in 0.43
4. Test isolation: Integration tests use TestRelay (ngit-grasp) or test-ngit-relay.sh (ngit-relay)
5. Work directory: All session docs go in work/, NOT root
6. Archive naming: Use YYYY-MM-DD-description.md format
7. test-ngit-relay.sh tests ngit-relay: This script tests the reference implementation, NOT ngit-grasp
8. Configuration sync: Config changes MUST be updated in all four places: src/config.rs, docs/reference/configuration.md, nix/module.nix, AND .env.example
9. Git dependencies: When updating Cargo.toml or Cargo.lock with ANY git dependency (not crates.io), you MUST update hashes in BOTH flake.nix and nix/module.nix. See docs/how-to/update-git-dependencies.md - this is MANDATORY and builds will fail if skipped

File Restrictions by Mode

Code mode can only edit files matching specific patterns (enforced by system):

• Example: Architect mode restricted to \.md$ files only
• Attempting to edit restricted files causes FileRestrictionError
• Check mode configuration if edit attempts fail unexpectedly

Quick Reference

# Test ngit-grasp (main project)
cargo test

# Build grasp-audit
cd grasp-audit && nix develop -c cargo build

# Run grasp-audit unit tests
cd grasp-audit && nix develop -c cargo test --lib

# Check session files
ls work/  # Should only have README.md when clean