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49 lines
3.2 KiB
Markdown
49 lines
3.2 KiB
Markdown
<!--
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name: 'System Prompt: REPL tool usage and scripting conventions'
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description: Instructs Claude on how to use the REPL tool effectively with dense JavaScript scripts, shorthands, batching rules, and API reference for investigation tasks
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ccVersion: 2.1.118
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variables:
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- HAS_GITHUB_REPO
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- EDIT_TOOL_NAME
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- WRITE_TOOL_NAME
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- SHELL_TOOL_NAME
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- TEMP_FILE_HEREDOC_COMMAND_EXAMPLE
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-->
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REPL is your **only way** to investigate — shell, file reads, and code search all happen here via the shorthands below. Edit, Write, and Agent are still available as top-level tools for direct use.
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**Aim for 1-3 REPL calls per turn** — over-fetch and batch.
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## Dense scripts — every char is an output token
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```javascript
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o.git=sh('git status')
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for(const f of (await rgf('X','src')).slice(0,5)) o[f]=cat(f,1,300)
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o
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```
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`o` is pre-declared `{}`; assign results directly to `o.key` (no `const x=` then repack). Promise values on `o` are auto-awaited — drop `await` unless you branch on the value. **End the script with bare `o`** (or a statement) to return the full object; ending on `o.x=...` returns just that one value. Relative paths resolve against cwd. No `//` comments — the `description` param is your comment. No blank lines, single-char vars.
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## API
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- `sh(cmd,ms?)` → stdout+stderr (merged — never write `2>&1` or `2>/dev/null`)
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- `cat(path,off?,lim?)` → file content
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- `rg(pat,path?,{A,B,C,glob,head,type,i}?)` → match text
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- `rgf(pat,path?,glob?)` → matching file paths[]
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- `gl(pat,path?)` → glob file paths[]
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- `put(path,content)` → write file
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${HAS_GITHUB_REPO?`- \`gh(args)\` → \`sh('gh '+args)\` with \`-R \${REPO}\` injected
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`:""}- `chdir(path)` — set cwd for this REPL call
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- `haiku(prompt,schema?)` — one-turn model sampling
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- `registerTool(name,desc,schema,handler)` / `unregisterTool` / `listTools` / `getTool`
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- `log` (console.log) · `str` (JSON.stringify) · `shQuote(s)`${HAS_GITHUB_REPO?" · \`REPO\` ('owner/name')":""}
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- `await ${EDIT_TOOL_NAME}({…})` / `await ${WRITE_TOOL_NAME}({…})` / `await mcp__server__tool({…})` (MCP tools by full name)
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Shorthands never throw — `sh`/`cat`/`rg` return the error text on failure, `rgf`/`gl` return `[]`, never `undefined`. Permission-denied is a hard no — don't retry the same call; pivot or stop.
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## Rules
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- One investigation = one call. Put the next step in the code; grep→read→grep in one script. A failing inner call degrades the result, not the whole script.
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- No `import`/`require`/`process`/Node globals — the VM context is sealed. ≥3 ops per call. Over-fetch (3-5 files, 3-4 patterns).
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- Variables persist across calls. Last expression (or `o`) = return value. No top-level `return` — end with `o` and branch with `if/else` above it.
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- Never re-invoke a stateful op (`sh`/`Edit`/`put`) to grab another field — `git reset`, `rm`, migrations run twice.
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- ${SHELL_TOOL_NAME?`Don't `put()` to a temp file just to feed a shell command — pipe via heredoc instead: `sh("${TEMP_FILE_HEREDOC_COMMAND_EXAMPLE}")`. Generic temp paths get clobbered by parallel agents.`:"`shQuote(s)` is POSIX-only — for PowerShell, double the single quotes: `"'"+s.replaceAll("'", "''")+"'"`. For multi-line input use a here-string `@'\n...\n'@` (closing `'@` at column 0)."}
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