IBM Bob's Review Mode Auto-Fixes Legacy Code Vulnerabilities
IBM Bob's agentic IDE uses Review Mode to detect 8 security flaws in COBOL banking code, applies one-liner fixes like SQLite locking for race conditions, and adds tests—modernizing to Python took 3 minutes for 4 Bob coins ($2 USD).
Agentic Workflow Enables Controlled Architectural Governance
IBM Bob differentiates from snippet-generating AI tools by enforcing architectural governance through distinct modes: Ask for queries, Code for implementation, Plan for strategy, and custom modes. This separates planning from execution, preventing unchecked changes. Users define permissions via an auto-approval modal, sandboxing actions like file reads/writes. In Code mode, Bob acts as a Python developer, transforming tasks into structured outputs. Pricing ties to compute: 1 Bob coin = $0.50 USD; the COBOL test used 4 coins, with a free trial offering 40 coins.
Review Mode integrates security scanning directly in the IDE (or CLI via Bob shell), flagging OWASP violations, hardcoded secrets, and injection risks in a triageable findings panel. Clicking issues triggers a lightbulb for auto-fixes, followed by optional unit test generation and execution to verify resolutions. This IDE-native auditing outperforms vague CLI agents by providing diff logs, structured panels, and full visibility—ideal for production codebases.
Autonomous Modernization of COBOL Banking Repo to Python Web App
Bob reverse-engineered an open-source COBOL "Z Bank" repository—simulating legacy mainframe ATM/banking logic—into a functional Streamlit web app in 3 minutes. The output included a dark-themed login (hardcoded demo creds), dashboard with operations like balance checks and transfers. While UI polish lagged (e.g., bright pop-up text), core functionality matched the original logic. No tests were added initially, mirroring legacy mainframe practices reliant on manual or proprietary tools absent from the repo.
Applying Review Mode post-modernization surfaced issues like SQLite race conditions, fixed with a one-liner BEGIN IMMEDIATE for locking. Bob then generated and ran targeted tests. Auditing the untouched original COBOL revealed 8 critical flaws, with fixes proposed even for ancient stacks—though test addition failed due to lacking COBOL frameworks, highlighting Bob's awareness of legacy constraints.
Trade-offs: IDE Structure Beats CLI Opacity for Complex Tasks
Bob's VS Code-like interface with side chat, mode picker, and findings panel offers transparency CLI agents lack, enabling structured workflows across planning, coding, and review. Hot take: IDEs like Bob provide better oversight for agentic coding than black-box CLIs, reducing errors in large repos. Drawbacks include occasional design lapses (UI brightness) and coin-based costs, but controls mitigate risks in autonomous tasks. For hardest coding like legacy migrations, prioritize tools with governance over raw speed.