api-mapper

A toolkit for studying undocumented web APIs by observing how a real Chrome browser communicates with websites.

In plain words
What is it for?
Use it to intercept requests, inspect JavaScript bundles, and write Markdown API documentation for client or SDK development.
Why use it?
It helps when an API has no usable documentation or when its behavior must be discovered from browser traffic and JavaScript code.

Skill for Claude CodeCodex

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 skills/11philip22/api-mapper-skill/api-mapper
Any agent
npx skills add 11philip22/api-mapper-skill --skill api-mapper
Clone the repo
git clone --depth 1 https://github.com/11philip22/api-mapper-skill

Made for: Claude Code, Codex.

Per session 177 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,088 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. Scan, not verified.
Origin unknown 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 $0.00177 $0.01088
Opus 5 $0.00088 $0.00544
Sonnet 5 $0.00035 $0.00218
Haiku 4.5 $0.00018 $0.00109

Measured 2d ago against content hash 85acae94d044, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

api-mapper scanned grade A with 1 finding 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

Reverse-engineer undocumented APIs using Chrome CDP and curl. Controls a real Chrome browser via
api-mapper/SKILL.md · 127 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Files

What ships with it

8 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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 · 127 lines · 177 tokens per session scan A 85acae94d044

Subscribe to this mod's changes

api-mapper is a skill published in the GitHub repository 11philip22/api-mapper-skill (7 stars, last pushed 9d ago), with no licence file. It adds 177 tokens to every session and 1,088 once invoked, about $0.0009 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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