Set up persistent agent identity files (AGENT.md, USER.md, MEMORY.md) and teach the agent to read them at every session start. Works in any Claude Code project — no external dependencies required. Trigger words: who am I, identity, remember me, agent name, my principles, who are you, what are my values.
A 17 of 17 checks passed. Deterministic, no model, same answer every run.
pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (6868 bytes)
pass: No zero-width or bidi control characters
pass: No instruction hidden inside an HTML comment
pass: No link to an exfiltration or paste host
pass: No credential-shaped string
pass: No instruction to send local credentials anywhere
pass: No text hidden with inline styles
pass: No prompt-injection phrasing
pass: No curl or wget piped into a shell
pass: No recursive delete of root, home or parent
pass: No instruction to read or print local credentials
pass: No base64 blob over 200 characters
pass: No link to a raw IP address
pass: No script tag
Source
GitHub
jkheadley/instar · 77 stars · license MIT · pushed 2026-09-05 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_4sgaem6j5gr34eru
GET https://markdownregistry.com/api/v1/resolve?ref=jkheadley/instar/agent-identity
GET https://markdownregistry.com/api/v1/blob/c30d1978501c31565f308284c6e4d978bbbbb87f5350dbaab14022a33597ac45