Earliest supported layer
Rules distinguish availability, discovery, parsing, configuration, dependency, connection, authentication, registration, exposure, activation, authorization, execution, and persistence.
Codex capability diagnosis
Why isn't this Codex capability working?
Paste the first error or describe what succeeds and what fails. Your browser removes common secrets before the evidence is analyzed.
Local redaction. Save only by choice.
Worked example — not your diagnosis Session exposure A compact output computed by the current deterministic ruleset. EXPOSED
Example evidence
MCP initialization succeeded and tools/list returned the expected tool names, but the tools do not appear in a genuinely new Codex Desktop session. The same capability works in Codex CLI, but it is missing from Codex Desktop.
Result
Session exposure · EXPOSED
The earliest supported failure is session exposure: the provider is connected or registering capabilities, but the active Codex session is not making the expected capability available.
Why this boundary
The supplied evidence explicitly separates a working connection/provider listing from a missing Codex-session capability.
Next safe check
Open one genuinely new session and check exact capability visibility
Separate a stale session capability set from provider startup, registration, or task activation.
Method and limits
A capability chain, not an AI guess
- Redacted on this device
- Inspectable deterministic ruleset · 15 checkpoints
- Saved only when you choose
Deterministic rules over your redacted evidence. What the tool cannot support, it declines to claim.
Evidence before verdict
A rule must meet a deterministic threshold. Conflicting or incomplete evidence becomes partial or unknown; it is not converted into a confident root cause.
No unknown execution
The site does not install capabilities, execute packages, contact private endpoints, edit configuration, or ask for credentials.
Private by explicit choice
A diagnosis is stateless by default. Saved reports use random URLs, expire after seven days, can be deleted immediately, and are excluded from indexing.