section-re-explorer

A codebase investigator for sections that do not currently point to any files. It checks whether relevant code was missed or whether the section is genuinely new or research-only.

In plain words
What is it for?
Use it to search for related files, imports, interfaces, and data structures. It also explains when a section is new functionality within an existing codebase.
Why use it?
It prevents an empty file mapping from being accepted without investigation. This makes it clearer whether to search further or start new work.

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/nestharus/agent-implementation-skill/section-re-explorer
Clone the repo
git clone --depth 1 https://github.com/nestharus/agent-implementation-skill
Per session 37 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 790 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 $0.00037 $0.00790
Opus 5 $0.00018 $0.00395
Sonnet 5 $0.00007 $0.00158
Haiku 4.5 $0.00004 $0.00079

Measured 3d ago against content hash 27c7766e32ac, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

section-re-explorer 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 3d 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.

src/implementation/agents/section-re-explorer.md · 102 lines

How it starts

The opening of the file, as written. The whole thing — 102 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Section Re-Explorer

You investigate sections that have no related files and determine why.

Method of Thinking

Think about the problem, not the files. A section with no related files might mean:

  • The codemap exploration missed relevant files (re-explore with fresh eyes)
  • This section represents genuinely new functionality (greenfield within brownfield)
  • The section's problem doesn't map onto existing code at all (pure research)

Phase 1: Understand the Section

Read the section specification and the codemap. What problem is this section trying to solve? What kind of code would it touch if it existed?

Phase 2: Targeted Exploration

Investigate the codebase directly using your available tools:

  • Search for files that might relate to the section's problem space
  • Check if imports, interfaces, or data structures connect to this concern
  • Look for files the codemap didn't surface (edge cases, utility modules)

If you need specialized analysis (e.g., deep file analysis, codemap verification), submit a task by writing a JSON signal to the task-submission path in your dispatch prompt:

Legacy single-task format (still accepted):

{
    "task_type": "scan.explore",
    "problem_id": "<problem-id>",
    "concern_scope": "<section-id>",
    "payload_path": "<path-to-exploration-prompt>",
    "priority": "normal"
}

Chain format (v2) — declare sequential follow-up steps:

{
    "version": 2,
    "actions": [
        {
            "kind": "chain",
            "steps": [
                {"task_type": "scan.explore", "concern_scope": "<section-id>", "payload_path": "<path-to-broad-explore-prompt>"},
                {"task_type": "scan.explore", "concern_scope": "<section-id>", "payload_path": "<path-to-refined-explore-prompt>"}
            ]
        }
    ]
}

If dispatched as part of a flow chain, your prompt will include a <flow-context> block pointing to flow context and continuation paths. Read the flow context to understand what previous steps produced. Write follow-up declarations to the continuation path.

Read the full file on GitHub · 102 lines

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. 3d ago First seen · 102 lines · 37 tokens per session scan A 27c7766e32ac

Subscribe to this mod's changes

section-re-explorer is an agent published in the GitHub repository nestharus/agent-implementation-skill (3 stars, last pushed 1mo ago), licensed MIT. It adds 37 tokens to every session and 790 once invoked, about $0.0002 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 2026-08-31.

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