Workbench Flue Agent Harness

Workbench Flue Agent Harness

Use this skill when an issue asks to create, review, or package a deployable Flue agent, or when it declares FLUE_AGENT_CONTRACT.

Required Source Reads

Read only as much as the task requires:

1. docs/flue-agent-harness-lane.md
2. https://flueframework.com/start.md
3. https://raw.githubusercontent.com/withastro/flue/refs/heads/main/README.md
4. https://flueframework.com/models.json if the requested model is not one of the recommended IDs

If network access is unavailable, use the checked-in workbench doc and report FLAG unless the issue requires fresh upstream docs.

Required Contract

Do not scaffold until the issue provides or you can safely infer:

FLUE_AGENT_CONTRACT:
  purpose:
  project_directory:
  workspace_layout:
  agent_file:
  deploy_target:
  model_id:
  sandbox_mode:
  trigger:
  secrets_policy:
  validation_command:
  public_artifact_policy:

Inference rules:

• missing project_directory: use the issue's repo checkout only if it is the declared target;
• new or empty directory: workspace_layout: root;
• existing non-empty directory: workspace_layout: .flue;
• missing deploy target: prefer node;
• missing model: prefer anthropic/claude-sonnet-4-6 for starter agents;
• missing secrets policy: use none for pure virtual agents, otherwise env-only.

If a field cannot be inferred safely, return BLOCK with the smallest missing field list.

Safety Rules

• Do not invent API keys, OAuth material, cookies, or tokens.
• Do not paste secrets into prompts, durable docs, example payloads, or issue comments.
• Do not copy raw MCP request payloads or raw run transcripts into Git.
• Do not mutate Multica daemon, Desktop UI, runtime config, or live agent bindings from a Flue scaffold issue.
• Do not place a real Flue app inside this workbench repo unless the issue explicitly asks for it; this repo usually records the lane, not the app.

Implementation Rules

• For a new or empty project, create agents/ and roles/.
• For an existing non-empty project, create .flue/agents/ and .flue/roles/.
• Pass the selected model ID explicitly to init({ model: "<model_id>" }).
• Prefer flue dev --target node or flue dev --target cloudflare for local development.
• Do not use flue run --target cloudflare; use flue dev --target cloudflare or build and call a deployed endpoint.
• Grant host commands per prompt or skill, not globally, for CI/local sandbox agents.
• Keep starter agents close to one narrow workflow. Wider autonomy belongs in a later reviewed iteration.

Report Contract

Always close with:

FLUE_AGENT_REPORT
purpose:
project_directory:
workspace_layout:
agent_file:
deploy_target:
model_id:
sandbox_mode:
trigger:
secrets_policy:
files_changed:
validation:
residual_risk:
next_action:
VERDICT: PASS | FLAG | BLOCK

PASS requires a verified starter and clean public boundary. FLAG is correct when only external secrets, deploy credentials, or remote host setup remain. BLOCK is correct when the contract is incomplete, the model ID is unsupported, or the target path cannot be safely determined.