# Task: Create anthropic_thread Tool Config
## Context
Create the thread wrapper tool that adds thread-specific concerns (transcript storage, thread IDs) to the base `anthropic_messages` tool.
## Dependencies
- Must complete: `01-create-anthropic-messages-tool.md`
## Files to Create
- `.ai/tools/threads/anthropic_thread.yaml`
## Implementation Steps
1. Create `.ai/tools/threads/` directory if it doesn't exist
2. Create `anthropic_thread.yaml` that chains to `anthropic_messages`
3. Add thread-specific config (transcript path with `{thread_id}` template)
4. Add `thread_id` parameter
5. Configure streaming with file_sink + return
## Code Snippet
From doc lines 644-682:
```yaml
# .ai/tools/threads/anthropic_thread.yaml
tool_id: anthropic_thread
tool_type: http
version: "1.0.0"
description: "Run a conversation thread with Claude"
executor_id: anthropic_messages
config:
# Inherit from anthropic_messages, add thread-specific config
stream:
destinations:
- type: file_sink
path: ".ai/threads/{thread_id}/transcript.jsonl" # Per-thread directory
format: jsonl
- type: return
parameters:
- name: thread_id
type: string
required: true
description: "Unique thread identifier (permissive: alphanumeric, underscore, hyphen)"
# Note: safety_harness auto-generates this; base layer just validates format
- name: model
type: string
default: "claude-sonnet-4-20250514"
- name: max_tokens
type: integer
default: 4096
- name: stream
type: boolean
default: true
- name: system_prompt
type: string
required: false
- name: messages
type: array
required: true
```
## Success Criteria
- [ ] YAML file exists with correct structure
- [ ] Chains to `anthropic_messages` (executor_id)
- [ ] Transcript path uses `{thread_id}` template
- [ ] Both file_sink and return are configured
- [ ] thread_id parameter is required
- [ ] Other parameters inherit from parent
## Verification Command
```bash
# Validate YAML and check chain resolution
python -c "
import yaml
with open('.ai/tools/threads/anthropic_thread.yaml') as f:
config = yaml.safe_load(f)
assert config['executor_id'] == 'anthropic_messages'
assert 'thread_id' in [p['name'] for p in config['parameters']]
assert any(d['type'] == 'file_sink' for d in config['config']['stream']['destinations'])
print('anthropic_thread config validation passed!')
"
```
## Notes
- This tool chains to `anthropic_messages` (not directly to http_client)
- Config merging: child overrides parent
- Transcript path is per-thread directory
- `{thread_id}` is templated at execution time
- Default `stream=true` for thread tools
