* feat: add agent-to-agent delegation tool
Add `delegate` tool enabling multi-agent workflows where a primary agent
can hand off subtasks to specialized sub-agents with different
provider/model configurations.
- New `DelegateAgentConfig` in config schema with provider, model,
system_prompt, api_key, temperature, and max_depth fields
- `delegate` tool with recursion depth limits to prevent infinite loops
- Agents configured via `[agents.<name>]` TOML sections
- Sub-agents use `ReliableProvider` with fallback API key support
- Backward-compatible: empty agents map when section is absent
Closes#218
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
* fix: encrypt agent API keys and tighten delegation input validation
Address CodeRabbit review comments on PR #224:
1. Agent API key encryption (schema.rs):
- Config::load_or_init() now decrypts agents.*.api_key via SecretStore
- Config::save() encrypts plaintext agent API keys before writing
- Updated doc comment to document encryption behavior
- Added tests for encrypt-on-save and plaintext-when-disabled
2. Delegation input validation (delegate.rs):
- Added "additionalProperties": false to schema
- Added "minLength": 1 for agent and prompt fields
- Trim agent/prompt/context inputs, reject empty after trim
- Added tests for blank agent, blank prompt, whitespace trimming
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
* fix(delegate): replace mutable depth counter with immutable field
- Replace `current_depth: Arc<AtomicU32>` with `depth: u32` set at
construction time, eliminating TOCTOU race and cancel/panic safety
issues from fetch_add/fetch_sub pattern
- When sub-agents get their own tool registry, construct via
`with_depth(agents, key, parent.depth + 1)` for proper propagation
- Add tokio::time::timeout (120s) around provider calls to prevent
indefinite blocking from misbehaving sub-agent providers
- Rename misleading test whitespace_agent_name_not_found →
whitespace_agent_name_trimmed_and_found
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
* style: fix rustfmt formatting issues
Fixed all formatting issues reported by cargo fmt to pass CI lint checks.
- Line length adjustments
- Chain formatting consistency
- Trailing whitespace cleanup
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
---------
Co-authored-by: Edvard <ecschoye@stud.ntnu.no>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
