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A developer writing on September 21, 2026, said he was replacing Claude Code as his main coding tool with Pi, citing workflow limitations, instability and excess built-in instructions. The account is one user’s experience, not evidence of a broader migration; he said Pi’s open-source, customizable design better fit his needs.
A longtime Claude Code user says he is replacing Anthropic’s coding harness as his main development tool with Pi, an open-source alternative, after frustrations with its IDE workflow, frequent changes and feature set. In a report published September 21, 2026, the developer said the switch reflects his individual preferences, not a claim that Claude Code is broadly failing or that other users should leave.
The author, writing on his personal site, said he had used Claude Code since it became available through the Claude Pro subscription more than a year earlier. He described the move as the result of many small frustrations rather than one incident. The report does not identify him beyond the byline and site, caleb.software.
Among the problems he described was the handling of project guidance files. He said his repositories contained CLAUDE.md files, while other tools and projects may use the more general AGENTS.md format, creating extra work to copy or link instructions. He also said that when Claude Code was connected to VSCode, only one session at a time could receive text-selection context from the IDE. He reported that the official extension allowed multiple tabs but lacked or mishandled features he wanted, including some slash commands, a custom status line and readable presentation of concurrent subagent output.
The author also objected to the pace and direction of Claude Code updates. He reported that the tool had received 244 releases that year as of his writing and said more than three-quarters changed the system prompt or tool descriptions. He argued that such changes could affect model behavior and that the default Bash tool description added unnecessary instructions. These figures and assessments come from his account; the article does not independently verify release records or measure their effects.
Why One Developer Switched Tools
The account illustrates a choice facing developers using AI coding assistants: a tool’s value depends not only on model capability, but also on how reliably it fits a person’s existing editing and review process. The author’s complaints focus on workflow control and predictability—especially handling multiple tasks and keeping instructions consistent across projects—rather than on whether AI can generate code.
His preference for Pi also reflects the appeal of tools that users can modify themselves. He said he wrote a Pi extension for a workflow he could not get from Claude Code in about 20 minutes. That is a report of his experience, not a comparative benchmark of development time, quality or cost. The piece offers a specific user perspective on product trade-offs; it does not establish how common these concerns are among Claude Code users.
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Claude Code, Pi and Project Instructions
Claude Code is Anthropic’s coding assistant, which the author used inside VSCode as well as through its own interface. Pi is the alternative he chose; he characterized it as open source, minimalist and highly customizable. The report gives no systematic feature comparison, performance testing or pricing analysis between the two tools.
The author said that shortly after he decided to leave, Anthropic announced Claude Code would support AGENTS.md files. He viewed the change as arriving too late for his decision. The source provides no further details about the announcement’s rollout, supported behavior or availability, and the author did not say the change resolved his other complaints.
““For now, I’m leaving. I’m excited to lean more into Pi.””
— The author of the caleb.software report
What the Account Cannot Establish
The report documents one developer’s experience. It does not show how many users share his complaints, whether Claude Code’s release pace has affected other workflows, or whether Pi performs better across different projects and teams. The author’s release counts and prompt-size observations are not independently checked in the source material.
It is also unclear whether Anthropic’s announced AGENTS.md support was available to users at publication or how it would work alongside CLAUDE.md files. The report does not say whether the author plans to stop using Anthropic’s models altogether; he describes changing the harness, not a full departure from every Anthropic product.
The author said he had already written two extensions for Pi to support his preferred workflows and hoped to share them after cleaning them up. He also encouraged readers facing similar frustrations to try an open-source harness, but did not provide a publication date or repository link for the extensions.
For Anthropic, the reported AGENTS.md support is the clearest product development mentioned, though the source gives no rollout schedule or follow-up. Whether that change addresses the author’s concerns—or influences his decision—remains unknown.
Key Questions
Why is the author leaving Claude Code?
He cited a combination of IDE workflow limitations, extension shortcomings, frequent product changes and excess instructions. He described the decision as personal and cumulative, not the result of one event.
What is Pi?
Pi is the coding harness the author chose as his replacement. He described it as open source, minimalist and customizable; the report does not provide an independent technical comparison with Claude Code.
Did Anthropic respond to the concerns?
The author said Anthropic announced support for AGENTS.md files one day after he decided to switch. The source does not establish that the announcement was a response to his post, which had not yet been published, or explain when the feature would reach users.
Does this show that users are leaving Claude Code?
No. The source describes one developer’s decision and does not provide user numbers, survey results or evidence of a wider migration.
Source: caleb.software
