Meta flags reference

The canonical table of every single-letter flag across mg, ms, md, ma. Tokens shown as (token) take an inline argument.

mg (meta get)

Flag	Effect
b	Key is base64-encoded (spec); accepted but not decoded — the key is used verbatim
c	Return CAS in response
f	Return client flags
h	Return hit status (1 on hit)
k	Echo key in response
l	Return seconds since last access
O(token)	Opaque request/response correlator
q	Quiet on miss (suppress EN)
s	Return item size
t	Return remaining TTL in seconds
u	Don't bump LRU on hit
v	Return value (otherwise header-only)
T(token)	Update TTL to token seconds
N(token)	Auto-vivify on miss with TTL token
R(token)	Conditional recache win threshold (accepted but not yet implemented)
E(token)	Override CAS to token (accepted but not yet implemented)

ms (meta set)

Flag	Effect
b	Key is base64-encoded (spec); accepted but not decoded — key used verbatim
c	Return CAS on success
C(token)	Compare-and-swap against token
E(token)	Override CAS to token (accepted but not yet implemented)
F(token)	Set client flags (32-bit)
I	Mark stale instead of storing
k	Echo key in response
M(mode)	Mode: S set (default), E add, A append, P prepend, R replace
N(token)	Auto-vivify on miss with TTL (for append modes)
O(token)	Opaque correlator
q	Quiet — suppress only the success line (HD); errors (NS/EX/NF) are still returned
s	Return stored size
T(token)	TTL in seconds

md (meta delete)

Flag	Effect
b	Key is base64-encoded (spec); accepted but not decoded — key used verbatim
C(token)	Delete only if CAS matches
E(token)	Override CAS to token (accepted but not yet implemented)
I	Mark stale rather than remove
k	Echo key in response
O(token)	Opaque correlator
q	Quiet — suppress the benign outcomes (HD/NF); a CAS mismatch (EX) is still returned
T(token)	Update TTL when marking stale
x	Remove value but keep the metadata entry (accepted but not yet implemented)

ma (meta arithmetic)

Flag	Effect
b	Key is base64-encoded (spec); accepted but not decoded — key used verbatim
C(token)	Compare-and-swap
E(token)	Override CAS to token (accepted but not yet implemented)
N(token)	Auto-vivify on miss with TTL
J(token)	Initial value for auto-vivified entries
D(token)	Delta (default 1)
T(token)	Update TTL
M(mode)	Mode: I or + increment, D or - decrement
O(token)	Opaque correlator
q	Quiet — suppress only the success line; errors (NF/CLIENT_ERROR) are still returned
t	Return TTL
c	Return new CAS
v	Return new value (as VA <size>\r\n<value>\r\n)
k	Echo key in response

me (meta debug)

Flag	Effect
b	Key is base64-encoded (spec); accepted but not decoded — key used verbatim

me emits a single ME <key> <field>=<value>...\r\n line per entry listing internal state (expiry, last access, CAS, size). Format is debug-grade and may change between releases.

mn (meta no-op)

No flags. Always returns MN\r\n.

Response flags

These appear in the response after the two-letter token:

Response flag	Meaning
c<token>	CAS
f<token>	Client flags
s<token>	Size
t<token>	TTL in seconds
k<token>	Echoed key
O<token>	Echoed opaque
l<token>	Last-access time
h<token>	Hit flag (0 or 1)
X	Item is stale