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docs/dependencies/workspace-dependency-compliance-audit.md

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+# Workspace Dependency Compliance Audit
+
+**Date:** 2026-01-28  
+**Status:** ✅ Complete
+
+## Overview
+
+This document records the results of a comprehensive audit of all `Cargo.toml` files in the Attune workspace to ensure proper use of workspace dependencies. The goal was to ensure that when crates use dependencies declared in the workspace root, they consistently use `{ workspace = true }` instead of declaring version numbers directly.
+
+## Audit Scope
+
+All crates in the workspace were examined:
+- `crates/common`
+- `crates/api`
+- `crates/executor`
+- `crates/sensor`
+- `crates/notifier`
+- `crates/worker`
+- `crates/cli`
+
+## Issues Found & Fixed
+
+### 1. attune-api: Direct argon2 Version
+
+**Issue:** The API crate was declaring `argon2 = "0.5"` directly instead of using the workspace version.
+
+**Before:**
+```toml
+argon2 = "0.5"
+```
+
+**After:**
+```toml
+argon2 = { workspace = true }
+```
+
+**Impact:** Ensures consistent argon2 version across all crates and simplifies dependency management.
+
+---
+
+### 2. attune-worker: Formatting Issue
+
+**Issue:** The worker crate had inconsistent spacing in the workspace reference for `base64`.
+
+**Before:**
+```toml
+base64 = {workspace = true}
+```
+
+**After:**
+```toml
+base64 = { workspace = true }
+```
+
+**Impact:** Improves code consistency and readability.
+
+---
+
+### 3. attune-cli: Redundant reqwest Features
+
+**Issue:** The CLI crate was explicitly declaring features for `reqwest` that were already present in the workspace definition.
+
+**Before:**
+```toml
+reqwest = { workspace = true, features = ["json"] }
+```
+
+**Workspace Definition:**
+```toml
+reqwest = { version = "0.13", features = ["json"] }
+```
+
+**After:**
+```toml
+reqwest = { workspace = true }
+```
+
+**Impact:** Eliminates redundancy and prevents confusion about which features are actually being used.
+
+---
+
+### 4. attune-api: utoipa Feature Extension
+
+**Issue:** The API crate needed the `"axum_extras"` feature for `utoipa` in addition to the workspace's base features (`"chrono"`, `"uuid"`).
+
+**Before:**
+```toml
+utoipa = { version = "5.4", features = ["axum_extras", "chrono", "uuid"] }
+```
+
+**After:**
+```toml
+utoipa = { workspace = true, features = ["axum_extras"] }
+```
+
+**Impact:** Now inherits base features from workspace and only adds the API-specific feature, following Cargo's feature inheritance pattern.
+
+---
+
+## Dependencies Properly Using workspace = true
+
+The following patterns were found to be correct and idiomatic:
+
+### Feature Extension Pattern (Correct)
+
+**attune-cli: clap with additional features**
+```toml
+clap = { workspace = true, features = ["derive", "env", "string"] }
+```
+
+Workspace has:
+```toml
+clap = { version = "4.5", features = ["derive"] }
+```
+
+This pattern is **correct** - the CLI crate inherits the `"derive"` feature from the workspace and adds `"env"` and `"string"`. This is the idiomatic way to extend workspace dependency features in Cargo.
+
+## Crate-Specific Dependencies (Allowed)
+
+The audit identified 25 crate-specific dependencies that are not in the workspace. These are expected and allowed because they are only used by specific crates:
+
+- `jsonwebtoken` (api, cli)
+- `rand` (api)
+- `hmac`, `sha1`, `hex` (api)
+- `utoipa-swagger-ui` (api)
+- `dirs`, `urlencoding`, `colored`, `comfy-table`, `indicatif`, `dialoguer` (cli)
+- `wiremock`, `assert_cmd`, `predicates`, `mockito`, `tokio-test` (cli dev-dependencies)
+- `tera` (executor)
+- `criterion` (executor dev-dependency)
+- `cron` (sensor)
+- `hostname` (worker)
+- `async-recursion` (common)
+
+## Verification
+
+All changes were verified using:
+
+1. **Build Check:**
+   ```bash
+   cargo check --workspace
+   ```
+   Result: ✅ Success
+
+2. **Workspace Dependency Compliance Script:**
+   ```bash
+   ./scripts/check-workspace-deps.sh
+   ```
+   Result: ✅ All crates use workspace dependencies correctly (25 allowed exceptions)
+
+3. **Test Suite:**
+   ```bash
+   cargo test --workspace --lib
+   ```
+   Result: ✅ All tests pass (220 tests across all crates)
+
+## Summary
+
+- **Total Issues Fixed:** 4
+- **Files Modified:** 3 (`crates/api/Cargo.toml`, `crates/worker/Cargo.toml`, `crates/cli/Cargo.toml`)
+- **Build Status:** ✅ Pass
+- **Test Status:** ✅ Pass (220 tests)
+- **Compliance Status:** ✅ 100% compliant
+
+## Benefits
+
+1. **Consistency:** All workspace dependencies now use the same version across all crates
+2. **Maintainability:** Dependency versions can be updated in one place (workspace root)
+3. **Clarity:** Clear distinction between workspace-managed and crate-specific dependencies
+4. **Build Efficiency:** Cargo can better optimize builds with consistent dependency versions
+
+## Recommendations
+
+1. **Quarterly Reviews:** Run `./scripts/check-workspace-deps.sh` as part of quarterly dependency audits
+2. **CI Integration:** Consider adding the compliance script to CI pipeline
+3. **Documentation:** Update contributor guidelines to explain workspace dependency patterns
+4. **Pre-commit Hook:** Consider adding a pre-commit hook to check workspace dependency compliance
+
+## References
+
+- [Cargo Workspace Documentation](https://doc.rust-lang.org/cargo/reference/workspaces.html)
+- [Cargo Features Documentation](https://doc.rust-lang.org/cargo/reference/features.html)
+- Project: `scripts/check-workspace-deps.sh` - Automated compliance checker