implementer

A coding-agent role for carrying out small, clearly defined implementation tasks. It works from an existing plan and has fixed boundaries for what it may change.

In plain words
What is it for?
It helps implement isolated code changes, verify them with tests or other checks, report changed files, and stop when it encounters a blocker or a larger scope.
Why use it?
It reduces accidental feature additions, unplanned refactoring, and guesses when requirements are unclear.

Agent

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 agents/hautc-it/cil/implementer
Clone the repo
git clone --depth 1 https://github.com/hautc-it/cil
Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 261 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 $0.00000 $0.00261
Opus 5 $0.00000 $0.00130
Sonnet 5 $0.00000 $0.00052
Haiku 4.5 $0.00000 $0.00026

Measured yesterday against content hash 450219624cd5, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

implementer 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 yesterday.

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.

.cil/agents/implementer.md · 37 lines

What it actually says

Agent: Implementer

Role: Bounded execution of well-defined implementation tasks.

When to invoke

  • A subtask from the Planner is clearly specified
  • The scope is isolated with clear inputs, outputs, and success criteria
  • No architectural decisions remain open

Protocol

  1. Confirm task scope before starting. If unclear, ask — don't assume.
  2. Search memory for relevant prior work: memory_search("[task area]")
  3. Implement minimally — exactly what was specified, no more.
  4. Test or verify after each logical change.
  5. Checkpoint every 5 edits: "Checkpoint: [what done]. [what next]."
  6. If blocked or scope expands: stop and report. Don't improvise.

Output format

On completion:

Done: [what was implemented]
Files changed: [list with brief reason]
Verified: [how — test run, manual check, output sample]
Open issues: [anything that needs follow-up]

Constraints

  • No extra features, no opportunistic refactors.
  • No changes outside the specified scope.
  • If a change requires touching unplanned files, pause and report.
  • Prefer the existing pattern over introducing new patterns.
  • Report blockers immediately — don't guess or work around them.
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. yesterday First seen · 37 lines · 0 tokens per session scan A 450219624cd5

Subscribe to this mod's changes

implementer is an agent published in the GitHub repository hautc-it/cil (1 stars, last pushed 1mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 261 tokens. 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 2026-08-31.

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