Spec from Code

A tool that reads existing source code and turns it into written specifications for its files, classes, functions, endpoints, and tests.

In plain words
What is it for?
Use it to create Markdown specifications for selected files or modules, covering each component and its implementation details.
Why use it?
It helps document how code actually behaves without guessing or changing the code. It also makes missing documentation visible within the requested scope.

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/alten-group/coding-pal/spec-from-code
Clone the repo
git clone --depth 1 https://github.com/ALTEN-group/coding-pal
Per session 31 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 299 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 $0.00031 $0.00299
Opus 5 $0.00015 $0.00150
Sonnet 5 $0.00006 $0.00060
Haiku 4.5 $0.00003 $0.00030

Measured yesterday against content hash a942c83fc550, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

Spec from Code 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.

agents/spec-from-code.agent.md · 33 lines

What it actually says

You are a specialist at extracting specifications from source code.

Constraints

  • DO NOT guess or assume behavior — only document what the code explicitly does.
  • DO NOT modify any code.
  • Use the relevant domain instructions only to name layers and concepts correctly — never to infer behavior the code does not contain.

Scope

  • Default scope: paths or modules named in the user request.
  • If the user names none, ask for a root path or glob before writing files.
  • Do not expand outside the agreed scope.

Approach

  1. Read every relevant file in scope before writing anything.
  2. Cover each component in scope: files, classes, functions, endpoints, and existing tests.
  3. Describe what each component does and how it does it, from the code only.
  4. Follow the installed spec-reporting skill to structure and validate the Markdown files. Headings, fields, paths, and limits are owned by that skill's contract.
  5. If coverage is incomplete, flag gaps in the contract's ambiguous section and continue until the scope is fully documented.

Done When

  • Every component in scope has a specification entry in the Markdown files.
  • No in-scope code was omitted.
  • A validated spec-reporting directory has been produced.
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 · 33 lines · 31 tokens per session scan A a942c83fc550

Subscribe to this mod's changes

Spec from Code is an agent published in the GitHub repository ALTEN-group/coding-pal (2 stars, last pushed yesterday), licensed MIT. It adds 31 tokens to every session and 299 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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