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claude-runner

Claude/Codex CLI execution layer — prompt loading, stream-json parsing, file output extraction, path sanitization, skill file writing, and skill rule generation

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Overview

Claude/Codex CLI execution layer — prompt loading, stream-json parsing, file output extraction, path sanitization, skill file writing, and skill rule generation

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You are working on the CLI execution layer — the bridge between assembled prompts and the claude -p / codex exec CLIs, plus skill file I/O.

Key Concepts

Stream-JSON protocol (Claude): runClaude() always passes --verbose --output-format stream-json. Output is NDJSON: type: 'result' has final text + usage; type: 'assistant' has text/tool_use blocks; type: 'user' has tool_result blocks.
JSONL protocol (Codex): runCodex() spawns codex exec --json --sandbox read-only --ephemeral. The --ask-for-approval never flag is conditionally included based on capability detection (see below). Prompt is passed via stdin ('-' placeholder arg) to avoid shell arg length limits. Stdin write happens after event handlers are attached so fast failures are captured. Events: item.completed/item.updated with normalized types.
Codex capability detection: getCodexExecCapabilities() (internal, cached) runs codex exec --help and checks if --ask-for-approval appears in the help text. Result is cached in module-level codexExecCapabilities variable. If the help check fails (e.g., codex not installed), capabilities default to { supportsAskForApproval: false }. runCodex() only adds --ask-for-approval never when supportsAskForApproval is true.
Unified routing: runLLM(prompt, options, backendId) is the shared entry point — dispatches to runClaude() or runCodex() based on backendId. Exported from runner.js so command handlers no longer need local routing helpers.
Codex internals (private): normalizeCodexItemType() converts PascalCase/kebab-case to snake_case. collectCodexText() recursively extracts text from nested event content. Both are internal to runner.js.
Prompt templating: loadPrompt(name, vars) resolves {{partial-name}} from src/prompts/partials/ first, then substitutes {{varName}} from vars. Target-specific vars (skillsDir, skillFilename, instructionsFile, configDir) are passed by command handlers.
File output parsing: Primary: <file path="...">content</file> XML tags. Fallback:  comment markers. parseFileOutput(output, allowedPaths) accepts optional { dirPrefixes, exactFiles } to override default allowed paths.
Path sanitization: sanitizePath(rawPath, allowedPaths) (internal) blocks .. traversal, absolute paths. Defaults: .claude/ prefix + CLAUDE.md exact. Multi-target callers pass expanded allowed paths via getAllowedPaths() from target.js.
Validation: validateSkillFiles() checks for truncation (XML tag collisions), missing frontmatter, missing sections, bad file path references.
Skill rules generation: extractRulesFromSkills() reads all skills via skill-reader.js, produces skill-rules.json (v2.0) with file patterns, keywords, and intent patterns.
Domain patterns: generateDomainPatterns() converts file patterns to bash detect_skill_domain() function using BEGIN/END markers.
Trigger parsing precedence: parseTriggersFrontmatter(content) returns { filePatterns, keywords, alwaysActivate } parsed from a triggers: block in YAML frontmatter (supports block lists, inline arrays, and alwaysActivate: true for the base skill); returns null when no triggers: key exists. parseActivationPatterns and parseKeywords prefer this frontmatter when present and fall back to legacy ## Activation / Keywords: line parsing for older skills.
Settings merge: mergeSettings() merges aspens hook config into existing settings.json. Detects aspens-managed hooks by ASPENS_HOOK_MARKERS (skill-activation-prompt, graph-context-prompt, post-tool-use-tracker, save-tokens-statusline, save-tokens-prompt-guard, save-tokens-precompact). Also handles statusLine merging — replaces existing statusLine only if the current one is aspens-managed (detected by isAspensHook), preserving user-custom statusLine configs. After merging hooks, dedupeAspensHookEntries() removes duplicate aspens-managed entries per event type.
Directory-scoped writes: writeTransformedFiles() handles files outside .claude/ (e.g., src/billing/AGENTS.md) with explicit path allowlist — only CLAUDE.md, AGENTS.md exact files and .claude/, .agents/, .codex/ prefixes are permitted.
findSkillFiles matching: Only matches the exact skillFilename (e.g., skill.md or SKILL.md), not arbitrary .md files in the skills directory.

Critical Rules

Both --verbose and --output-format stream-json are required for Claude — omitting either breaks stream parsing.
Codex uses --json --sandbox read-only --ephemeral — --sandbox read-only restricts filesystem access, --ephemeral avoids persisting conversation. --ask-for-approval never is added only if getCodexExecCapabilities() confirms support. Prompt goes via stdin, not as a CLI arg.
Codex stdin write order matters — event handlers (stdout, stderr, close, error) must be attached before writing to stdin, so fast failures are captured.
Path sanitization is non-negotiable — sanitizePath() blocks .. traversal, absolute paths, and any path not in the allowed set.
Prompt partials resolve before variables — {{skill-format}} resolves to partials/skill-format.md first. If no file, falls through to variable substitution.
Timeout resolution: resolveTimeout(flagValue, fallbackSeconds) — --timeout flag wins, then ASPENS_TIMEOUT env, then caller-provided fallback. Size-based defaults (small: 120s, medium: 300s, large: 600s, very-large: 900s) are set by command handlers, not runner.
Disk writes are sanitized — writeSkillFiles and writeTransformedFiles pass every payload through sanitizePublishedContent so forbidden blocks (## Activation, ## Key Files, hub/cluster/hotspot tables outside code-map.md) cannot leak to disk even if an earlier stage missed them.
mergeSettings preserves non-aspens hooks and statusLine — identifies aspens hooks by ASPENS_HOOK_MARKERS (now includes save-tokens markers), replaces matching entries, preserves everything else. StatusLine only replaced if current one is aspens-managed. Post-merge deduplication ensures no duplicate aspens entries accumulate.
Debug mode: Set ASPENS_DEBUG=1 to dump raw stream-json to $TMPDIR/aspens-debug-stream.json (Claude) or $TMPDIR/aspens-debug-codex-stream.json (Codex). Codex also logs exit code and output length to stderr.

Last Updated: 2026-05-11

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File metadata

name: claude-runner
description: Claude/Codex CLI execution layer — prompt loading, stream-json parsing, file output extraction, path sanitization, skill file writing, and skill rule generation
triggers:
  files:
    - src/lib/runner.js
    - src/lib/timeout.js
    - src/lib/skill-writer.js
    - src/lib/skill-reader.js
    - src/prompts/**/*.md
  keywords:
    - runClaude
    - runCodex
    - runLLM
    - stream-json
    - codex exec
    - parseFileOutput
    - sanitizePath
    - loadPrompt
    - writeSkillFiles
    - skill-rules
    - mergeSettings
    - resolveTimeout

View original text

---
name: claude-runner
description: Claude/Codex CLI execution layer — prompt loading, stream-json parsing, file output extraction, path sanitization, skill file writing, and skill rule generation
triggers:
  files:
    - src/lib/runner.js
    - src/lib/timeout.js
    - src/lib/skill-writer.js
    - src/lib/skill-reader.js
    - src/prompts/**/*.md
  keywords:
    - runClaude
    - runCodex
    - runLLM
    - stream-json
    - codex exec
    - parseFileOutput
    - sanitizePath
    - loadPrompt
    - writeSkillFiles
    - skill-rules
    - mergeSettings
    - resolveTimeout
---

You are working on the **CLI execution layer** — the bridge between assembled prompts and the `claude -p` / `codex exec` CLIs, plus skill file I/O.

## Key Concepts
- **Stream-JSON protocol (Claude):** `runClaude()` always passes `--verbose --output-format stream-json`. Output is NDJSON: `type: 'result'` has final text + usage; `type: 'assistant'` has text/tool_use blocks; `type: 'user'` has tool_result blocks.
- **JSONL protocol (Codex):** `runCodex()` spawns `codex exec --json --sandbox read-only --ephemeral`. The `--ask-for-approval never` flag is **conditionally included** based on capability detection (see below). Prompt is passed via **stdin** (`'-'` placeholder arg) to avoid shell arg length limits. Stdin write happens **after** event handlers are attached so fast failures are captured. Events: `item.completed`/`item.updated` with normalized types.
- **Codex capability detection:** `getCodexExecCapabilities()` (internal, cached) runs `codex exec --help` and checks if `--ask-for-approval` appears in the help text. Result is cached in module-level `codexExecCapabilities` variable. If the help check fails (e.g., codex not installed), capabilities default to `{ supportsAskForApproval: false }`. `runCodex()` only adds `--ask-for-approval never` when `supportsAskForApproval` is true.
- **Unified routing:** `runLLM(prompt, options, backendId)` is the shared entry point — dispatches to `runClaude()` or `runCodex()` based on `backendId`. Exported from `runner.js` so command handlers no longer need local routing helpers.
- **Codex internals (private):** `normalizeCodexItemType()` converts PascalCase/kebab-case to snake_case. `collectCodexText()` recursively extracts text from nested event content. Both are internal to runner.js.
- **Prompt templating:** `loadPrompt(name, vars)` resolves `{{partial-name}}` from `src/prompts/partials/` first, then substitutes `{{varName}}` from `vars`. Target-specific vars (`skillsDir`, `skillFilename`, `instructionsFile`, `configDir`) are passed by command handlers.
- **File output parsing:** Primary: `<file path="...">content</file>` XML tags. Fallback: `<!-- file: path -->` comment markers. `parseFileOutput(output, allowedPaths)` accepts optional `{ dirPrefixes, exactFiles }` to override default allowed paths.
- **Path sanitization:** `sanitizePath(rawPath, allowedPaths)` (internal) blocks `..` traversal, absolute paths. Defaults: `.claude/` prefix + `CLAUDE.md` exact. Multi-target callers pass expanded allowed paths via `getAllowedPaths()` from `target.js`.
- **Validation:** `validateSkillFiles()` checks for truncation (XML tag collisions), missing frontmatter, missing sections, bad file path references.
- **Skill rules generation:** `extractRulesFromSkills()` reads all skills via `skill-reader.js`, produces `skill-rules.json` (v2.0) with file patterns, keywords, and intent patterns.
- **Domain patterns:** `generateDomainPatterns()` converts file patterns to bash `detect_skill_domain()` function using `BEGIN/END` markers.
- **Trigger parsing precedence:** `parseTriggersFrontmatter(content)` returns `{ filePatterns, keywords, alwaysActivate }` parsed from a `triggers:` block in YAML frontmatter (supports block lists, inline arrays, and `alwaysActivate: true` for the base skill); returns `null` when no `triggers:` key exists. `parseActivationPatterns` and `parseKeywords` prefer this frontmatter when present and fall back to legacy `## Activation` / `Keywords:` line parsing for older skills.
- **Settings merge:** `mergeSettings()` merges aspens hook config into existing `settings.json`. Detects aspens-managed hooks by `ASPENS_HOOK_MARKERS` (`skill-activation-prompt`, `graph-context-prompt`, `post-tool-use-tracker`, `save-tokens-statusline`, `save-tokens-prompt-guard`, `save-tokens-precompact`). Also handles `statusLine` merging — replaces existing statusLine only if the current one is aspens-managed (detected by `isAspensHook`), preserving user-custom statusLine configs. After merging hooks, `dedupeAspensHookEntries()` removes duplicate aspens-managed entries per event type.
- **Directory-scoped writes:** `writeTransformedFiles()` handles files outside `.claude/` (e.g., `src/billing/AGENTS.md`) with explicit path allowlist — only `CLAUDE.md`, `AGENTS.md` exact files and `.claude/`, `.agents/`, `.codex/` prefixes are permitted.
- **`findSkillFiles` matching:** Only matches the exact `skillFilename` (e.g., `skill.md` or `SKILL.md`), not arbitrary `.md` files in the skills directory.

## Critical Rules
- **Both `--verbose` and `--output-format stream-json` are required for Claude** — omitting either breaks stream parsing.
- **Codex uses `--json --sandbox read-only --ephemeral`** — `--sandbox read-only` restricts filesystem access, `--ephemeral` avoids persisting conversation. `--ask-for-approval never` is added only if `getCodexExecCapabilities()` confirms support. Prompt goes via stdin, not as a CLI arg.
- **Codex stdin write order matters** — event handlers (`stdout`, `stderr`, `close`, `error`) must be attached before writing to stdin, so fast failures are captured.
- **Path sanitization is non-negotiable** — `sanitizePath()` blocks `..` traversal, absolute paths, and any path not in the allowed set.
- **Prompt partials resolve before variables** — `{{skill-format}}` resolves to `partials/skill-format.md` first. If no file, falls through to variable substitution.
- **Timeout resolution:** `resolveTimeout(flagValue, fallbackSeconds)` — `--timeout` flag wins, then `ASPENS_TIMEOUT` env, then caller-provided fallback. Size-based defaults (small: 120s, medium: 300s, large: 600s, very-large: 900s) are set by command handlers, not runner.
- **Disk writes are sanitized** — `writeSkillFiles` and `writeTransformedFiles` pass every payload through `sanitizePublishedContent` so forbidden blocks (`## Activation`, `## Key Files`, hub/cluster/hotspot tables outside `code-map.md`) cannot leak to disk even if an earlier stage missed them.
- **`mergeSettings` preserves non-aspens hooks and statusLine** — identifies aspens hooks by `ASPENS_HOOK_MARKERS` (now includes save-tokens markers), replaces matching entries, preserves everything else. StatusLine only replaced if current one is aspens-managed. Post-merge deduplication ensures no duplicate aspens entries accumulate.
- **Debug mode:** Set `ASPENS_DEBUG=1` to dump raw stream-json to `$TMPDIR/aspens-debug-stream.json` (Claude) or `$TMPDIR/aspens-debug-codex-stream.json` (Codex). Codex also logs exit code and output length to stderr.

---
**Last Updated:** 2026-05-11

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Source needs review

The tracked source changed or could not be synchronized. Review the current source before installing.

Review before install: Avoid automatic install

License: MIT

Dependency or permission surface needs review
Permission surface may require sandboxing
Financial research output is not financial advice; require human review before any live investment decision
The skill documentation does not explicitly mention handling of secrets or environment variables, though the described implementation includes sandboxing and path sanitization.
The skill is tightly coupled to a specific repository structure, which may limit its reusability outside that context.
Financial research output is not financial advice; require human review before any live investment decision.
Quality score needs review
Permission surface needs review: secrets or environment access, shell or command execution
Stars/forks activity: 100 stars, 7 forks; issue activity unavailable in current metadata
Dependency/runtime risk: command execution surface, credential or environment access
Permission surface: secrets or environment access, shell or command execution

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[![Listed on OpenAgentSkill](https://www.openagentskill.com/api/badge/aspenkit-claude-runner?metric=listed&label=Listed)](https://www.openagentskill.com/skills/aspenkit-claude-runner?ref=github&utm_source=github&utm_medium=referral&utm_campaign=creator_badge)
[![OpenAgentSkill Trust](https://www.openagentskill.com/api/badge/aspenkit-claude-runner?metric=trust&label=Trust)](https://www.openagentskill.com/skills/aspenkit-claude-runner?ref=github&utm_source=github&utm_medium=referral&utm_campaign=creator_badge)
[![OpenAgentSkill Audit](https://www.openagentskill.com/api/badge/aspenkit-claude-runner?metric=audit&label=Audit)](https://www.openagentskill.com/skills/aspenkit-claude-runner/audit)
[![Agent Proven](https://www.openagentskill.com/api/badge/aspenkit-claude-runner?metric=proven&label=Agent%20Proven)](https://www.openagentskill.com/skills/aspenkit-claude-runner?ref=github&utm_source=github&utm_medium=referral&utm_campaign=creator_badge)

Preview badge Open audit Creator kit

Community signal

Share whether this skill looks useful for your agent workflow. Aggregated feedback improves rankings over time.

claude-runner

Overview

Key Concepts

Critical Rules

Review the source

Source & usage notes

Agent access

For the creator

Registry indexed

Claim this skill listing

Add the evidence badges to your README

Community signal

Start with one small task

Overview

Key Concepts

Critical Rules

Review the source

Source & usage notes

Agent access

Related skills

For the creator

Registry indexed

Claim this skill listing

Add the evidence badges to your README

Community signal

Start with one small task