flow-implement

A command that runs the implementation stage of a defined Flow. It follows test-driven development, meaning tests guide the code from failing to passing, then verifies the result and makes a scoped commit.

In plain words
What is it for?
Use it to implement the current Flow or a specified Flow ID, including its tests, verification, and commit.
Why use it?
It structures implementation work and requires fresh checks before recording the changes.

Command

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add commands/cofin/flow/flow-implement
Clone the repo
git clone --depth 1 https://github.com/cofin/flow
Per session 9 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 492 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00009 $0.00492
Opus 5 $0.00005 $0.00246
Sonnet 5 $0.00002 $0.00098
Haiku 4.5 $0.00001 $0.00049

Measured 2d ago against content hash ee1f7db96b46, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

flow-implement scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

commands/flow-implement.md · 68 lines

What it actually says

{
  "agent": "executor",
  "argument_schema": {
    "optional": [
      "flow_id"
    ],
    "required": [],
    "syntax": "[flow_id]"
  },
  "bounds_enforcement": "agent_validated",
  "canonical_id": "flow/implement",
  "capability_evidence": "Claude Code declared AskUserQuestion contract",
  "choice_max": 4,
  "choice_min": 2,
  "completion_gates": [
    "red_green_refactor",
    "fresh_verification",
    "scoped_commit"
  ],
  "custom_answer_behavior": "native_custom_input",
  "disabled_choice_policy": "omit",
  "fallback": "Use Flow to implement the current task",
  "git_tags": "forbidden",
  "host": "claude_code",
  "instruction": "Load the lifecycle owner and follow the canonical procedure source directly.",
  "interaction_mode": "none",
  "invocation": "/flow-implement",
  "kind": "flow_command_adapter",
  "lifecycle_owner": "flow-execution",
  "multi_select": true,
  "mutability": "repository_write",
  "mutual_exclusion": true,
  "plan_capability": "none",
  "procedure_source": "skills/flow/references/implement.md",
  "question_capability": null,
  "question_permission_check": "declared_and_allowed",
  "question_tool": "AskUserQuestion",
  "question_transport": "conditional_native",
  "runtime_dependency": "agent_file_tools_only",
  "sequential_fallback": true,
  "shared_contracts": [
    "flow-state-v1",
    "worksheet-execution-v1"
  ],
  "state_operations": [
    "status",
    "claim",
    "discover",
    "block",
    "release",
    "checkpoint",
    "close"
  ],
  "supported_selection_modes": [
    "binary",
    "single_select",
    "multi_select"
  ]
}
Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 68 lines · 9 tokens per session scan A ee1f7db96b46

Subscribe to this mod's changes

flow-implement is a command published in the GitHub repository cofin/flow (16 stars, last pushed 3d ago), licensed Apache-2.0. It adds 9 tokens to every session and 492 once invoked, about $0.0000 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.