Symphony

Symphony

Rust orchestration engine that polls issue trackers (Linear, GitHub), creates isolated workspaces, and runs coding agents automatically.

Install

cargo install symphony-cli                # from source
curl -fsSL https://raw.githubusercontent.com/broomva/symphony/master/install.sh | sh  # binary
docker pull ghcr.io/broomva/symphony:latest  # container

Quick Start

symphony init                          # scaffold WORKFLOW.md (Linear default)
symphony init --tracker github          # GitHub Issues template
# Edit WORKFLOW.md — fill in project details, API key, repo
symphony validate WORKFLOW.md           # verify config
symphony start WORKFLOW.md              # run daemon

Commands

Flags: --port, --host, --token, --format json, --concurrency, --turns, --once, --tickets STI-1,STI-2

--format json is supported by: status, issues, workspaces, workspace, config.

WORKFLOW.md

YAML frontmatter (config) + Liquid template body (agent prompt). For complete reference: references/workflow-config.md.

Minimal example:

---
tracker:
  kind: linear              # or github
  api_key: $LINEAR_API_KEY
  project_slug: your-slug
codex:
  command: claude --dangerously-skip-permissions
---
Fix {{ issue.identifier }}: {{ issue.title }}
{{ issue.description }}

Agent Lifecycle

Poll tracker → fetch active issues → sort by priority → dispatch workers
    ├─ after_create hook (clone repo)
    ├─ before_run hook (rebase)
    ├─ render prompt + run agent (max_turns)
    ├─ after_run hook (commit, push, create PR)
    ├─ pr_feedback hook (capture review comments)
    ├─ done_state transition (auto-close issue)
    └─ retry (1s continuation / exponential backoff)

Control Metalayer

The control metalayer (CONTROL.md) grounds all development:

CHECK setpoints → IMPLEMENT → MEASURE (make smoke) → VERIFY → DOCUMENT → FEEDBACK

Set up: create CONTROL.md with setpoints, add sensors in Makefile, reference in agent prompt.

Extending

Implement TrackerClient trait (4 methods: fetch_candidate_issues, fetch_issues_by_states, fetch_issue_states_by_ids, set_issue_state). Register in create_tracker() factory.

Arcan Runtime

When runtime.kind: arcan is configured, Symphony dispatches work through the Arcan HTTP daemon instead of spawning local subprocesses.

runtime:
  kind: arcan
  base_url: http://localhost:3000    # Arcan daemon URL
  policy:
    allow_capabilities: [read, write, shell]
    gate_capabilities: [network]

Flow: health check (GET /health) → create session (POST /sessions) → execute run (POST /sessions/{id}/runs) → poll state until complete.

Arcan session IDs follow the pattern symphony-{issue_identifier}.

Key Environment Variables

Troubleshooting

See references/troubleshooting.md for auth failures, stuck retries, hook errors, missing PRs, and monitoring setup.