write-discoverable-code: Research & Knowledge for AI Agents | OpenAgentSkill

Overview

Rules for writing code that coding agents (and humans) can find and understand through plain-text search. Apply whenever writing or renaming code: functions, types, constants, files, error messages, doc comments. Grounded in measurement: agents navigate by plain-text search, not by AST or language server, so every identifier is a search query and every search miss costs wasted reads.

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Write discoverable code

Coding agents discover code by searching for strings and reading small windows around the hits. They have no hover text, no jump-to-definition, and no memory between sessions. These rules make code resolvable in one search instead of five.

1. Names are search queries

Exported symbols get 2–4 word names, at least one of them a domain word. diffUserObjects, not diff. queueEventForDispatch, not queue. Measured on a ~700k-line monorepo: 1-word exported names are globally unique 61% of the time; 3-word names 96%; 4+ words 98%. Three words is the knee of the curve. Use the shortest name that greps uniquely; put the rest in the doc comment.
Give generic verbs their object. sanitizeEmailHtml, not sanitize; validateSmtpConfig, not validateConfig. Qualify only as far as uniqueness requires, then stop.
One definition site per symbol. Never copy a function between files; move it and delete the original in the same change. Shared helpers get one concept-named home and are imported everywhere else.
Do not rely on the module path to disambiguate a generic name. The import that disambiguates users/diff.ts from orders/diff.ts sits at the top of the file; the search hit is at line 300. Put the context in the symbol (formatDurationMs), not the folder. Exception: rigid, absolute conventions where the path carries the meaning (e.g. every contract file exporting Input/Output).
One concept, one spelling. Pick organizationId or orgId and use it everywhere; every synonym splits every future search in half. Reuse existing vocabulary in the codebase you are editing rather than introducing near-synonyms.
When behavior or audience changes, rename in the same commit. A stale name is misinformation with a 100% open rate — that includes visibility markers: a _private helper that other modules now import needs a public name.
Filenames are names too — never use bare-role filenames. config.ts, types.ts, utils.ts, helpers.ts, handlers.ts say nothing in a search result and collide with every other module's config/types/utils in the repo. Prefix the domain: billing-plan-config.ts, not config.ts. (index.ts is acceptable only as a thin re-export entry point.)

2. Types are the documentation agents can't skip

Brand your primitive IDs. z.string().brand<'UserId'>() (TS) or newtypes (Rust). A transferOwnership(userId: string, orgId: string) signature makes argument transposition invisible; branded types make it a compile error that names the concepts.
Use capability-token parameter types for privileged operations (e.g. requiring an OrgScopedDb instead of a raw connection). A comment is a request; a required type is physics.
Model state with discriminated unions, not clusters of nullable fields with implicit rules.
Name types like they'll be quoted back — they will be, in compiler errors the agent uses to self-correct. OrgScopedDb explains itself; Ctx2 does not. Avoid any: every any is a spot where the compiler goes silent and the agent is back to guessing.

3. Say it where the search lands

One-line doc comment on every export, stating the sharpest constraint the code itself can't show (units, timezone, "source time, not insert time", ownership). The definition is where a name search lands; that line is your whole message.
Write the plain-words phrase in the doc comment. Searches arrive as natural language ("rate limit", "retry delay"), and camelCase identifiers don't match phrase greps — RateLimiter is invisible to a search for "rate limit". The doc comment above each export should contain, in ordinary spaced-out words, the phrase someone would search for: a SessionExpiryChecker should say /*_ Checks whether the user session has expired. _/ so that a grep for "session expired" or "session has expired" lands here.
A module should make sense with its imports unread. Each imported name plus its doc line should say enough that the reader never has to open the source module. If they do, the import's name is failing, not the reader.
Keep strings whole. Never build event names, flags, or error codes with template interpolation (`github.${entity}.${action}` makes github.pr.merged unsearchable). Write the full literal even when a loop feels DRYer.
Error messages start with a unique literal prefix, so a message seen in a log greps straight back to the throw site. throw new Error(`Webhook signature mismatch for ${id}`), never throw new Error(`${prefix}: mismatch`).
One searchable concept per file, and keep orchestrators thin. The code that answers "where is X done?" should live in a module named after X — the thing a reader would ask about, not the mechanism inside — not inline in a coordinator, pipeline, or service class. An orchestrator should read as a sequence of calls into well-named modules; if a reader lands in it from a search, every line should point them one hop from the real implementation. Burying the implementation of several concepts in one large file makes every search for any of them land on the same wall of code. Split until each question-sized concept has one named home, then stop: a helper meaningful only inside one concept belongs inline, and a file per tiny function fragments one answer across several reads. The test runs both ways: a module that answers many unrelated questions is holding more than one concept.
Colocate tests (foo.test.ts next to foo.ts) so one search finds behavior and its specification together.
Mark dead ends. @deprecated on the old path, with a pointer to the new one.

Quick checklist before committing

Would one search for each new exported name be enough to find its implementation?
Would swapping two arguments of the new function fail the build?
Is the one thing a caller must know but the signature can't say (units, timezone, ownership, ordering) written right at the definition?
Do all log/error strings exist verbatim in the source?
Did anything change behavior without changing its name?
When code moved, is it gone from where it came from?

View source ↗

File metadata

name: write-discoverable-code
description: |
  Rules for writing code that coding agents (and humans) can find and understand through
  plain-text search. Apply whenever writing or renaming code: functions, types, constants,
  files, error messages, doc comments.

  Grounded in measurement: agents navigate by plain-text search, not by AST or
  language server, so every identifier is a search query and every search miss
  costs wasted reads.
license: MIT

View original text

---
name: write-discoverable-code
description: |
Rules for writing code that coding agents (and humans) can find and understand through
plain-text search. Apply whenever writing or renaming code: functions, types, constants,
files, error messages, doc comments.

Grounded in measurement: agents navigate by plain-text search, not by AST or
language server, so every identifier is a search query and every search miss
costs wasted reads.
license: MIT
---

# Write discoverable code

Coding agents discover code by searching for strings and reading small windows around the
hits. They have no hover text, no jump-to-definition, and no memory between sessions. These
rules make code resolvable in one search instead of five.

## 1. Names are search queries

- **Exported symbols get 2–4 word names, at least one of them a domain word.**
`diffUserObjects`, not `diff`. `queueEventForDispatch`, not `queue`.
Measured on a ~700k-line monorepo: 1-word exported names are globally unique 61% of
the time; 3-word names 96%; 4+ words 98%. Three words is the knee of the curve.
Use the shortest name that greps uniquely; put the rest in the doc comment.
- **Give generic verbs their object.** `sanitizeEmailHtml`, not `sanitize`;
`validateSmtpConfig`, not `validateConfig`. Qualify only as far as uniqueness
requires, then stop.
- **One definition site per symbol.** Never copy a function between files; move it and
delete the original in the same change. Shared helpers get one concept-named home
and are imported everywhere else.
- **Do not rely on the module path to disambiguate a generic name.** The import that
disambiguates `users/diff.ts` from `orders/diff.ts` sits at the top of the file; the
search hit is at line 300. Put the context in the symbol (`formatDurationMs`), not the
folder. Exception: rigid, absolute conventions where the path carries the meaning
(e.g. every contract file exporting `Input`/`Output`).
- **One concept, one spelling.** Pick `organizationId` or `orgId` and use it everywhere;
every synonym splits every future search in half. Reuse existing vocabulary in the
codebase you are editing rather than introducing near-synonyms.
- **When behavior or audience changes, rename in the same commit.** A stale name is
misinformation with a 100% open rate — that includes visibility markers: a `_private`
helper that other modules now import needs a public name.
- **Filenames are names too — never use bare-role filenames.** `config.ts`, `types.ts`,
`utils.ts`, `helpers.ts`, `handlers.ts` say nothing in a search result and collide with
every other module's config/types/utils in the repo. Prefix the domain:
`billing-plan-config.ts`, not `config.ts`. (`index.ts` is acceptable only as a
thin re-export entry point.)

## 2. Types are the documentation agents can't skip

- **Brand your primitive IDs.** `z.string().brand<'UserId'>()` (TS) or newtypes (Rust).
A `transferOwnership(userId: string, orgId: string)` signature makes argument
transposition invisible; branded types make it a compile error that names the concepts.
- **Use capability-token parameter types** for privileged operations (e.g. requiring an
`OrgScopedDb` instead of a raw connection). A comment is a request; a required type is
physics.
- **Model state with discriminated unions**, not clusters of nullable fields with implicit
rules.
- **Name types like they'll be quoted back** — they will be, in compiler errors the agent
uses to self-correct. `OrgScopedDb` explains itself; `Ctx2` does not. Avoid `any`: every
`any` is a spot where the compiler goes silent and the agent is back to guessing.

## 3. Say it where the search lands

- **One-line doc comment on every export**, stating the sharpest constraint the code
itself can't show (units, timezone, "source time, not insert time", ownership).
The definition is where a name search lands; that line is your whole message.
- **Write the plain-words phrase in the doc comment.** Searches arrive as natural language
("rate limit", "retry delay"), and camelCase identifiers don't match phrase greps —
`RateLimiter` is invisible to a search for "rate limit". The doc comment above each
export should contain, in ordinary spaced-out words, the phrase someone would search
for: a `SessionExpiryChecker` should say /\*_ Checks whether the user session has
expired. _/ so that a grep for "session expired" or "session has expired" lands here.
- **A module should make sense with its imports unread.** Each imported name plus its
doc line should say enough that the reader never has to open the source module. If
they do, the import's name is failing, not the reader.
- **Keep strings whole.** Never build event names, flags, or error codes with template
interpolation (`` `github.${entity}.${action}` `` makes `github.pr.merged` unsearchable).
Write the full literal even when a loop feels DRYer.
- **Error messages start with a unique literal prefix**, so a message seen in a log greps
straight back to the throw site. ``throw new Error(`Webhook signature mismatch for ${id}`)``,
never ``throw new Error(`${prefix}: mismatch`)``.
- **One searchable concept per file, and keep orchestrators thin.** The code that answers
"where is X done?" should live in a module named after X — the thing a reader would
ask about, not the mechanism inside — not inline in a coordinator,
pipeline, or service class. An orchestrator should read as a sequence of calls into
well-named modules; if a reader lands in it from a search, every line should point them
one hop from the real implementation. Burying the implementation of several concepts in
one large file makes every search for any of them land on the same wall of code.
Split until each question-sized concept has one named home, then stop: a helper
meaningful only inside one concept belongs inline, and a file per tiny function
fragments one answer across several reads. The test runs both ways: a module that
answers many unrelated questions is holding more than one concept.
- **Colocate tests** (`foo.test.ts` next to `foo.ts`) so one search finds behavior and its
specification together.
- **Mark dead ends.** `@deprecated` on the old path, with a pointer to the new one.

## Quick checklist before committing

1. Would one search for each new exported name be enough to find its implementation?
2. Would swapping two arguments of the new function fail the build?
3. Is the one thing a caller must know but the signature can't say (units, timezone,
ownership, ordering) written right at the definition?
4. Do all log/error strings exist verbatim in the source?
5. Did anything change behavior without changing its name?
6. When code moved, is it gone from where it came from?

Review the source

Skill source recorded

Skill instructions are recorded. This is not a runtime test, safety guarantee or compatibility certification.

Review before install: Avoid automatic install

License: MIT

Permission surface may require sandboxing
Potential broker, wallet, exchange, or real-money execution surface; sandbox and explicit approval are required
This skill may touch real-money trading, broker, wallet, or exchange operations; use only in a sandbox with explicit approval.
Quality score needs review
Permission surface needs review: secrets or environment access, filesystem or document access
GitHub adoption: 54 GitHub stars
Stars/forks activity: 54 stars, 1 forks; issue activity unavailable in current metadata
Permission surface: secrets or environment access, filesystem or document access

Open full audit

Listed tools are metadata hints, not tested compatibility. Agent prompts are suggested handoffs.

Start with one small task

1Read the source. Confirm the input, expected output, dependencies and permissions.
2Ask your agent for a plan. Approve setup and any costs before running a small isolated test.
3

Source & usage notes

IndexedAI Reviewed

Repository metadata and review signals are advisory. Popularity, source discovery and successful execution are different facts.

Source repository: modem-dev/skills
License: MIT
Version: 1.0.0
Last GitHub push: Aug 19, 2026
Registry updated: Sep 9, 2026
Instruction path: write-discoverable-code/SKILL.md @ edcdedb38a54

Version reported in registry metadata; check source releases before relying on it.

Quality

61/100

Promising

Trust

63/100

Agent access

This page exposes the same decision, trust, audit, use-case, and install signals through the Registry API, so agents can rank this skill without scraping the UI.

Open install API LLM text format Open manifest Auto-resolve Plan

More details

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      "Permission surface: secrets or environment access, filesystem or document access"
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    "scenario": "Research agents",
    "maintenance": "1mo since push",
    "risk": "Risky"
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  "alternative_skills": [],
  "do_not_use_when": [
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    "high-compliance environments without internal security review",
    "No OpenAgentSkill engagement data yet",
    "Audit risk risky exceeds max_risk=medium",
    "High-risk permission hints: Secrets or environment access",
    "Permission surface may require sandboxing",
    "Potential broker, wallet, exchange, or real-money execution surface; sandbox and explicit approval are required",
    "This skill may touch real-money trading, broker, wallet, or exchange operations; use only in a sandbox with explicit approval."
  ],
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    "install_policy": "block",
    "minimum_review_before_use": [
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      "Audit: 74/100 Risky",
      "Safety: 42/100 Avoid automatic install",
      "Review repository, license, install command, and permission surface before production use."
    ],
    "expected_agent_output": {
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    ],
    "payload_template": {
      "event_id": "<install_receipt.outcome_feedback.event_id or feedback.event_id from /api/agent/resolve>",
      "skill_slug": "modem-dev-write-discoverable-code",
      "task": "Use write-discoverable-code in an agent workflow",
      "agent": "codex",
      "outcome": "success",
      "install_used": true,
      "risk_blocked": false,
      "setup_required": false,
      "task_success": true,
      "output_quality": 4,
      "error_type": null,
      "human_review_required": false,
      "workspace": "sandbox",
      "time_to_useful_ms": 120000,
      "notes": "Report the smallest successful task, setup friction, files touched, and risk notes."
    }
  },
  "endpoints": {
    "web": "https://www.openagentskill.com/skills/modem-dev-write-discoverable-code",
    "api": "https://www.openagentskill.com/api/agent/skills/modem-dev-write-discoverable-code",
    "audit": "https://www.openagentskill.com/skills/modem-dev-write-discoverable-code/audit",
    "eval": "https://www.openagentskill.com/api/agent/evals?slug=modem-dev-write-discoverable-code&task=Use%20write-discoverable-code%20in%20an%20agent%20workflow&max_risk=medium",
    "resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20write-discoverable-code%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
    "receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20write-discoverable-code%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
    "install": "https://www.openagentskill.com/api/skills/modem-dev-write-discoverable-code/install",
    "manifest": "https://www.openagentskill.com/api/registry/manifest/modem-dev-write-discoverable-code"
  }
}

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Creator: modem-dev
Source: modem-dev/skills
Indexed by: OpenAgentSkill community index

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[![Listed on OpenAgentSkill](https://www.openagentskill.com/api/badge/modem-dev-write-discoverable-code?metric=listed&label=Listed)](https://www.openagentskill.com/skills/modem-dev-write-discoverable-code?ref=github&utm_source=github&utm_medium=referral&utm_campaign=creator_badge)
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