MAINFRAME

The AI-Native Bash Runtime

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|                                                                      |
|     AI agents control computers through bash.                        |
|     MAINFRAME makes that safe, accurate, and efficient.              |
+======================================================================+

AI agents control computers through bash. MAINFRAME makes that safe, accurate, and efficient.

3,821+ Pure Bash Functions | 152 Libraries | Zero Dependencies | AI-Native Runtime

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Quick Install

One-Line Install (Recommended)

curl -fsSL https://raw.githubusercontent.com/gtwatts/mainframe/main/get-mainframe.sh | bash

Manual Install

git clone https://github.com/gtwatts/mainframe.git ~/.mainframe
~/.mainframe/install.sh

Verify installation:

source ~/.bashrc  # or restart your terminal
source "$MAINFRAME_ROOT/lib/common.sh" && uuid

That's it. Your AI agents now have a safe, efficient bash runtime with persistent memory.

For detailed installation options, see INSTALL.md.

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What is MAINFRAME?

MAINFRAME is the runtime layer between AI agents and the operating system.

AI agents - whether Claude Code, Codex, Gemini, Cursor, or custom LLM-powered tools - interact with computers primarily through bash. They write shell commands to navigate filesystems, manipulate data, manage processes, and orchestrate system operations.

The problem: AI agents have finite context windows and bash is hostile territory.

Problem	MAINFRAME Solution
Context windows fill up, losing critical state	Agent Working Memory (AWM) - persistent storage outside context
Commands fail silently or with cryptic errors	Structured Output (USOP) - JSON envelopes with clear error codes
Output is unstructured and unparseable	Typed Responses - every operation returns parseable JSON
Security vulnerabilities are one typo away	Validation Layer - input sanitization, path traversal prevention
Sub-agents can't inherit learnings from parent agents	AWM Inheritance - child agents receive parent discoveries
External tools (jq, sed, awk) may not exist	Zero Dependencies - pure bash 4.0+, no external tools required

MAINFRAME provides:

Capability	What It Means
Agent Working Memory (AWM)	Persistent memory OUTSIDE the context window - sessions, checkpoints, discoveries survive between turns
Safe Execution	Validation before action, guardrails against damage, no accidental rm -rf /
Structured Output	JSON envelopes for every operation - AI parses results reliably
First-Time Correctness	Clear errors, predictable behavior, no trial-and-error loops
Sub-Agent Inheritance	Child agents inherit discoveries and state from parent agents
Zero Dependencies	Pure bash. Works on any system with bash 4.0+. No jq, no sed, no awk required.

# One line gives AI access to 3,821+ battle-tested functions
source "${MAINFRAME_ROOT}/lib/common.sh"

---

Agent Working Memory (AWM)

The breakthrough feature for AI agents with finite context windows.

AI agents forget everything outside their context window. AWM provides persistent external memory that survives context limits, session interruptions, and even crashes.

How It Works

# Initialize a session
awm_init "migrate-database"
# Session ID: a1b2c3d4e5f6

# Store key findings OUTSIDE the context window
awm_discovery "Database uses UTF-8 encoding"
awm_discovery "API rate limit is 100 req/min, not 1000"
awm_checkpoint "current_step" "3"
awm_checkpoint "api_config" '{"endpoint":"https://api.example.com"}'

# Track progress
awm_progress "file-processing" "47/200" "Processing batch 47"

# Log categorized messages
awm_log "decisions" "Chose PostgreSQL over MySQL for transactions"
awm_log "errors" "Warning: config missing, using defaults"

# Later: Resume where you left off
awm_resume "a1b2c3d4e5f6"
step=$(awm_get "current_step")  # Returns "3"

Sub-Agent Inheritance

Parent agents can pass context to child agents - discoveries, checkpoints, and learned state transfer automatically:

# Parent agent discovers important facts
awm_init "orchestrator"
awm_discovery "Project uses TypeScript 5.0"
awm_discovery "Deployment target is AWS Lambda"
awm_checkpoint "active_branch" "feature/auth"

# Spawn a child agent with inherited context
awm_init "code-reviewer" "$PARENT_SESSION_ID"
# Child automatically has access to:
# - All parent discoveries
# - All parent checkpoints
# - Parent's learned state

Namespace Isolation

Multiple agents can work simultaneously without interference:

# Each agent operates in its own namespace
awm_namespace "code-reviewer"
awm_init "review-auth-module"
awm_discovery "Found SQL injection in line 42"

awm_namespace "debugger"
awm_init "debug-crash"
awm_discovery "Stack overflow at recursive call"
# Completely isolated from code-reviewer's findings

Token Budget Management

AWM estimates token usage and helps agents stay within context limits:

# Estimate how many tokens the session will consume
tokens=$(awm_token_estimate)
echo "Session would use ~$tokens tokens"

# Check if within limits
awm_check_limits || echo "Session too large, consider compression"

# Get a context-efficient summary
summary=$(awm_summary)

Key AWM Functions

Function	Purpose
awm_init	Create a new session, optionally inheriting from parent
awm_close	Close session, mark as complete
awm_resume	Resume a previous session by ID
awm_checkpoint	Store key-value pair (atomic, persistent)
awm_get	Retrieve a checkpointed value
awm_discovery	Log a high-priority insight
awm_log	Categorized logging (tasks, errors, decisions, etc.)
awm_progress	Track progress with current/total
awm_summary	Get JSON summary of session state
awm_context_for	Generate context package for sub-agent
awm_namespace	Set namespace for agent isolation
awm_token_estimate	Estimate tokens for session data
awm_recent	Get last N entries from a category
awm_list	List all sessions

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Why MAINFRAME?

The Problem

AI agents write fragile bash that:

• Loses state - Context window resets, all learning lost
• Fails unpredictably - External tools like jq, sed, awk may not exist
• Requires retries - Cryptic errors need multiple attempts to debug
• Causes damage - No guardrails against destructive operations
• Wastes tokens - Verbose scripts consume context window
• Can't coordinate - Sub-agents start from scratch

Every failed command costs tokens, time, and trust.

The Solution

MAINFRAME provides a safe runtime with persistent memory and first-time correctness:

# WITHOUT MAINFRAME - AI writes fragile, volatile code
str="  hello  "
str="${str#"${str%%[![:space:]]*}"}"  # Cryptic parameter expansion
str="${str%"${str##*[![:space:]]}"}"  # Fails if AI forgets a quote
# State lost when context window fills

# WITH MAINFRAME - Safe, readable, persistent
source "$MAINFRAME_ROOT/lib/common.sh"
awm_init "my-task"
trim_string "  hello  "                              # Safe, tested
awm_checkpoint "processed" "$str"                    # Persists outside context
awm_discovery "String contained leading whitespace"  # Learning preserved

Result: AI agents complete tasks in one pass, remember what they learned, and pass knowledge to sub-agents.

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For AI Agent Developers

MAINFRAME is designed for teams building autonomous AI systems that interact with operating systems through bash.

Universal Structured Output Protocol (USOP)

Every MAINFRAME operation can return structured JSON that AI agents parse reliably:

export MAINFRAME_OUTPUT=json

# Operations return structured envelopes
output_success "file created" "verify_file"
# {"ok":true,"data":"file created","hint":"verify_file","meta":{"elapsed_ms":2}}

output_error "E_NOT_FOUND" "Config missing" "run init first"
# {"ok":false,"error":{"code":"E_NOT_FOUND","msg":"Config missing","suggestion":"run init first"}}

# Typed outputs for type-safe parsing
output_int 42                    # {"ok":true,"data":42}
output_bool true                 # {"ok":true,"data":true}
output_json_object '{"id":1}'    # {"ok":true,"data":{"id":1}}

Why this matters: AI agents don't need to parse free-form text. They receive structured data they can act on immediately.

Safe Command Dispatch

MAINFRAME never uses eval. All operations validate inputs before execution:

# Path validation prevents directory traversal attacks
validate_path_safe "$user_input" "/allowed/base" || die 1 "Invalid path"

# Command validation blocks injection attempts
validate_command_safe "$cmd" || die 1 "Command rejected"

# Sanitization for all user-provided data
sanitized=$(sanitize_shell_arg "$untrusted_input")

Idempotent Operations

Safe to retry. Safe to run multiple times. No accidental damage:

# These operations check state before acting
ensure_dir "/path/to/dir"           # Creates only if missing
ensure_file "/path/to/file" "content"  # Writes only if different
ensure_line "/etc/hosts" "127.0.0.1 myapp"  # Adds only if absent
ensure_symlink "/link" "/target"    # Creates only if needed

# Atomic operations with automatic rollback
atomic_write "/path/to/file" "content"     # Writes to temp, moves atomically
file_checkpoint "/important/file"          # Creates backup point
file_rollback "/important/file"            # Restores from checkpoint

Multi-Agent Coordination

For systems running multiple AI agents that need to coordinate:

# Lock guards prevent concurrent execution
guard_lock "/tmp/deploy.lock" || exit 1
# ... critical section ...
guard_unlock "/tmp/deploy.lock"

# AWM namespaces isolate concurrent agents
awm_namespace "agent-1"
awm_init "task-a"  # Isolated from agent-2

# Context handoff between agents
context=$(awm_context_for "sub-agent")
# Pass $context to spawned agent

Project Intelligence

AI agents can instantly understand any codebase:

# Detect project type, framework, package manager
project_detect "/path/to/project"
# Returns JSON: {"language":"python","framework":"fastapi","package_manager":"pip"}

# Get available commands for the project
project_commands "/path/to/project"
# Returns: ["npm run build", "npm run test", "npm run start"]

# Token-efficient context summaries
context_summary "/path/to/project" --max-tokens 2000

---

For AI Coding Assistants

MAINFRAME works with all AI coding assistants that can execute bash.

Supported Platforms

Platform	Integration	Setup
Claude Code	Full skill integration	ln -s ~/.mainframe/skills/claude-code ~/.claude/skills/mainframe-bash
Clawdbot	Config + source	Add to ~/.clawdbot/clawdbot.json preamble
Cursor	.mdc rules	cp ~/.mainframe/skills/cursor/mainframe.mdc .cursor/rules/
Aider	CONVENTIONS.md	Add read: CONVENTIONS.md to .aider.conf.yml
OpenCode	CLAUDE.md	Point at this repo's CLAUDE.md
Custom Agents	System prompt	Load skills/vercel-ai-sdk/system-prompt.md

Token Savings

MAINFRAME reduces token usage by 71% per bash task:

Task	Without MAINFRAME	With MAINFRAME	Savings
JSON Creation	72 tokens	26 tokens	64%
Array Operations	101 tokens	39 tokens	62%
HTTP + Retry	154 tokens	32 tokens	80%
String Trimming	40 tokens	17 tokens	58%
Date Arithmetic	64 tokens	15 tokens	77%
Path Validation	129 tokens	21 tokens	84%

Compounding effect: 10 bash tasks/day at 71% savings = 3x more productivity before hitting token caps.

---

Library Reference

MAINFRAME provides 152 libraries with 3,821+ functions organized by category.

AI Agent Infrastructure - Memory, agents, context

Library	Functions	Purpose
awm.sh	34	Agent Working Memory - persistent state, inheritance, checkpoints
agent.sh	45+	Agent lifecycle, retries, coordination, execution
context.sh	20+	Token estimation, context budgeting, truncation
cache.sh	25+	Memoization, content-addressable storage, LRU eviction
diff.sh	25+	Surgical file editing, search-and-replace, patch application

Data Processing - JSON, CSV, strings, arrays

Library	Functions	Purpose
json.sh	34	JSON generation without jq - json_object, json_array, json_merge
csv.sh	34	RFC 4180 CSV parsing - csv_row, csv_parse_line, csv_to_json
pure-string.sh	34	String manipulation - trim_string, to_lower, replace_all
pure-array.sh	33	Array operations - array_unique, array_join, array_filter
template.sh	30	Mustache-style templates - template::render, conditionals, loops

Network and HTTP - HTTP client, URL parsing

Library	Functions	Purpose
burl.sh	33	AI-native HTTP client - GET/POST/PUT/DELETE, retries, JSON responses
http.sh	35	HTTP utilities and helpers
git.sh	52	Git workflow helpers - git_branch, git_is_dirty

System Operations - Files, processes, environment

Library	Functions	Purpose
pure-file.sh	37	File operations without cat/head/tail
proc.sh	40	Process management, locks, timeouts
env.sh	36	Environment variables, dotenv loading
path.sh	30	Cross-platform path manipulation
docker.sh	57	Docker/Compose container management
k8s.sh	52	Kubernetes kubectl wrapper

Package Managers - npm, bun, pip

Library	Functions	Purpose
bun.sh	20	Bun package manager - install, add, remove, run
python.sh	40+	Python/pip/venv management

Safety Layer - Validation, guards, errors

Library	Functions	Purpose
validation.sh	34	Input validation, sanitization
guard.sh	21	Defensive guards for AI scripts
error.sh	25	Try/catch, stack traces, error context
safe.sh	21	Strict mode helpers, gotcha prevention

AI Agent Optimized - Idempotency, atomicity, observability

Library	Functions	Purpose
output.sh	25+	Universal Structured Output Protocol (USOP)
idempotent.sh	15+	ensure_dir, ensure_file, ensure_line
atomic.sh	15+	atomic_write, file_checkpoint, file_rollback
observe.sh	20+	Structured observability, tracing
project.sh	15+	Project detection and intelligence
contract.sh	15+	Design-by-Contract assertions

V10 AI-Native Runtime - Verification, intent, healing, prediction

Library	Functions	Purpose
verify.sh	20+	Pre-execution verification - detect errors before they happen
intent.sh	20+	Natural language parsing to structured intent
generate.sh	12+	AI code generation from descriptions
heal.sh	29+	Self-healing error recovery with confidence scoring
predict.sh	13+	Predict resource usage (time/memory/risk) before execution
optimize.sh	13+	Automatic command optimization
graph.sh	27+	DAG workflow execution with auto-parallelization
temporal.sh	52+	SQL-like queries on command history
agent_loop.sh	35+	Persistent background agent processes
state_machine.sh	26+	Visual workflow state machines
uap_v2.sh	42+	ZeroMQ-like agent messaging with RPC and streaming

Language Analysis - TypeScript, Python (no runtime required)

Library	Functions	Purpose
typescript.sh	22	Import analysis, API diff, bundle size estimation
python.sh	17	Import analysis, dependency detection, code metrics

DevOps and CI/CD - Portability, health checks

Library	Functions	Purpose
ci.sh	35+	CI/CD portability across GitHub, GitLab, Jenkins, etc.
health.sh	27	Health check framework with HTTP server
compat.sh	50+	BSD/GNU compatibility, WSL detection
sysinfo.sh	40+	System detection, resource monitoring

UI and CLI - Terminal output, argument parsing

Library	Functions	Purpose
ansi.sh	90	Terminal colors and styling
tui.sh	30	Progress bars, spinners, prompts
cli.sh	35	Declarative CLI framework with auto-help
log.sh	30	Structured JSON logging with levels

For complete function signatures, see CHEATSHEET.md.

---

Benchmarks

MAINFRAME's pure bash operations outperform external tools by 20-72x:

Operation	External Tool	MAINFRAME	Speedup
Trim whitespace	2379 ms	33 ms	72x faster
Lowercase	778 ms	16 ms	49x faster
String replace	986 ms	18 ms	55x faster
Array unique	823 ms	39 ms	21x faster
File head	620 ms	31 ms	20x faster
Count lines	662 ms	24 ms	28x faster
Get basename	579 ms	17 ms	34x faster

Benchmarks: 1000 iterations each, pure bash vs. sed/awk/external tools

Run benchmarks yourself:

bash benchmarks/superpower_benchmarks.sh

---

Testing

MAINFRAME has 11,300+ tests with comprehensive coverage:

$ ./tests/bats/bin/bats tests/unit/
ok 1 - trim_string removes leading/trailing whitespace
ok 2 - to_lower converts to lowercase
...
ok 11360 - verify_command: detects typos

11360 tests, 0 failures

Run the test suite:

# bats-core is included as a git submodule
git submodule update --init
./tests/bats/bin/bats tests/unit/

---

What's New in V10

MAINFRAME V10 is the AI-Native Bash Runtime - transforming bash from a brittle shell into a robust execution environment for AI agents.

Headline Features

Capability	Description
Pre-Execution Verification	Catch 90% of errors before execution with verify_command
Natural Language to Bash	Parse intent with intent_parse, generate code with intent_to_bash
Self-Healing Execution	Auto-recover from 70% of common errors with heal_wrap
Predictive Resources	Predict time/memory/risk before running with predict_resources
Graph Workflows	Define DAG workflows that auto-parallelize with graph_execute
Temporal Queries	SQL-like queries on command history with temporal_query
Persistent Agents	Background agent loops with agent_loop_start
ZeroMQ-like Messaging	RPC, streaming, broadcast with uap_v2_call

V10 Libraries (12 New Libraries, ~289 Functions)

Library	Functions	Purpose
verify.sh	20+	Pre-execution static analysis and typo detection
intent.sh	20+	Natural language parsing to structured intent
generate.sh	12+	AI code generation from descriptions
graph.sh	27+	DAG workflow execution with auto-parallelization
heal.sh	29+	Self-healing error recovery with confidence scores
predict.sh	13+	Resource prediction (time/memory/risk) for commands
optimize.sh	13+	Automatic command optimization
temporal.sh	52+	SQL-like command history queries
agent_loop.sh	35+	Persistent background agent processes
state_machine.sh	26+	Visual workflow state machines
uap_v2.sh	42+	ZeroMQ-like agent messaging (RPC + streaming)

Example: V10 in Action

# Verify before execute
result=$(verify_command "find / -name '*.log' 2>/dev/null")
echo "$result" | jq '.valid'  # false - warns about root directory scan

# Natural language to bash
intent=$(intent_parse "find Python files modified today")
bash_cmd=$(intent_to_bash "$intent")
echo "$bash_cmd"  # find . -name '*.py' -mtime -1 -type f

# Self-healing execution
heal_wrap "deploy_to_prod.sh"  # Auto-retries, suggests fixes on failure

# Predict before running
predict_resources "npm install"  # {"time_s":30,"memory_mb":512,"risk":"low"}

---

Documentation

• Installation Guide - Detailed setup instructions
• Full Function Reference - All 3,821+ function signatures
• AI Agent Integration - Instructions for AI coding assistants
• Contributing - How to contribute
• Roadmap - Planned features and improvements

---

Shell Completion

MAINFRAME includes tab completion for both bash and zsh.

Bash

# Source directly (add to ~/.bashrc for persistence)
source "${MAINFRAME_ROOT:-$HOME/.mainframe}/completions/mainframe.bash"

# Or install system-wide
sudo cp completions/mainframe.bash /etc/bash_completion.d/mainframe

Zsh

# Source directly (add to ~/.zshrc for persistence)
source "${MAINFRAME_ROOT:-$HOME/.mainframe}/completions/mainframe.zsh"

# Or add to fpath for autoloading
fpath=("${MAINFRAME_ROOT:-$HOME/.mainframe}/completions" $fpath)
autoload -Uz compinit && compinit

# For Oh My Zsh users
cp completions/mainframe.zsh ~/.oh-my-zsh/completions/_mainframe

After setup, type mainframe and press Tab to see available commands.

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Contributing

We welcome contributions. See CONTRIBUTING.md for guidelines.

1. Fork the repository
2. Create a feature branch
3. Add tests for new functions (maintain coverage)
4. Submit a pull request

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License

MIT License - Use freely in your projects. See LICENSE.

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The Mission

We're building MAINFRAME for a safe and accurate future for agentic AI.

Bash is how AI agents control computer systems. It deserves a runtime built for safety, persistence, and first-time correctness.

Every command an AI agent executes should be:

• Safe - Validated inputs, guardrails, no accidental damage
• Persistent - Memory survives context limits and crashes
• Accurate - First-time correctness, structured output, clear errors
• Efficient - Minimal tokens, minimal retries, minimal friction

MAINFRAME is that runtime.

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"Knowing Your Shell is half the battle."

Install Now | Full Docs | Report Issues

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3,821+ functions | 152 libraries | Zero dependencies | AI-Native Runtime

# Mainframe V10 - AI-Native Bash Runtime